Bigger spur gear vs smaller. I am not sure about the Kimborough.

Bigger spur gear vs smaller Finding or making a So which spur size is best and why? Will this decision change depending the size of the track? There are so many threads about this. 09 (4. I’m in Australia and cannot purchase a Mod 1 pinion any bigger than 30teeth and of course it will not mesh with the 39 spur and I can’t cut any of the motor mount to let it slide in further as the adjustment (like 18th gear on a pushbike) With smaller pinions and bigger spur gears you will get more torque (faster acceleration) and less top speed. resulting in a larger contact area and improved load-carrying capacity. Which makes her less likely to go out on weekend trips by herself. The spur gear remains more cost-effective than other gears, such as helical gears. Below, picture of a Spur gear set. All the formulas you'll ever need can be found here. If you were to drive the large spur gear, the smaller one would revolve much faster meaning that there would be a torque reduction and a speed increase on the other spur gear. I have very little room to build the speed with my current set-up. Follow edited Aug 31, 2016 at 22:07. However, it is important to note that while a smaller spur gear will increase the top speed, it will also reduce the torque and acceleration of the RC car. Bigger Smaller. I am 6'2 190, side sleeper with a wide pad, and I am very comfortable in the copper spur ul1, so you will have plenty of room. Of course the problem is mitigated because a) you are only planning on half a turn so you can choose a portion of the larger For example, if I want more speed, do I go with bigger pinion or smaller spur gear? Reply. You can use a gear adapter for a Yeti to run normal spurs-- Traxxas and Kimbrough both make 32P 72T gears which can take the spur/pinion ratio from 3. Just orderd a wrap up heavy duty steel 14T & 18T 48P pinion. Tech Elite . 9) Fig. Larger the pinion, bigger speed and more heat. because a pinion with a larger number of teeth moves that spur more than one with a smaller number of teeth. Whenever gear teeth are generated by hobbing, it is as though a rack gear is rolling along a gear blank (circle with diameter equal to outer diameter of gear tooth), material being subtracted wherever the rack gear has been. works the same way with the spur gear too. (like 18th gear on a pushbike) With smaller pinions and bigger spur gears you will get more torque (faster acceleration) and less top speed. Unlike pinion gears, spur gears are configured differently depending on whether your car is a 2-wheel-drive or 4-wheel-drive. For me the local cost of the tooling is around $20 AUD. asked Aug 31, 2016 at 19:34. Either get a gear with a 3. Another vote for the 2. Guess which country is bigger, who has more money or which item is heavier! Bigger Smaller. The Hubba Hubba, on the other hand, has a smaller vestibule area (two vestibules with 7. The distinctive feature of worm gears is the combination of a worm (a gear in the form of a screw) that meshes with a worm wheel (a larger, helical gear). The gear ratio produced by two spur gears working in tandem is the ratio between the number of teeth in the two gears; the ratio can also be determined by the ratio of the gears’ pitch diameters. I normally run a 7. 3025e . Ideally, 27” - big enough for multiplayer, barely light enough to be movable by one person, shows all the detail clearly on 480i content, nice big scanlines on 240p content, and the perfect size to make light gun games fun like I’m the arcade (Time Crisis) — But if it’s just for N64 and older, you can go down to a 13” set without losing any detail on screen thanks to all those Helical Gear. Smaller Pinion Gear Smaller gear ratio Bigger pinion Gear Bigger gear ratio Smaller Spur Gear Bigger gear ratio Bigger Spur Gear Smaller gear ratio Overall Ratio Overall Ratio = (Spur/Pinion)*Internal Gearbox Ratio The lower the number of turns the more the motor will rev, but the smaller the pinion/bigger spur will be needed to let the motor spin up into it's power band. Adding an idler spur gear between the drive gear and the driven gear does not change the ratio, regardless of the number of teeth. Anyone remember having to take Fairly new to pan car so I have a gearing question. Experimenting with different combinations of pinion and spur gears allows you to fine-tune your RC car's gearing to match your driving preferences and terrain. 09). Tooth surface durability is calculated in accordance with the contact stress, to figure out the strength against the tooth surface damage (Pitting). Tech Addict Bigger pinion, or smaller spur gives a better top speed, but less acceleration. In this case going from 52T to 47T spur should result in 5-tooth larger pinions respectively (24/26/28). I can't speak to parts since I haven't broken any yet. Copper Spur is the Big Agnes’ ultralight freestanding tent series. If you're a manufacturer or engineer looking for more advice or still looking to learn more, you can always reach out to us at Illinois Pulley & Gear . (like 1st gear on a pushbike) This will also de-stress the electronics and shift the load onto the drive mechanics. Spur gears have straight teeth that are parallel to the gear axis, while helical gears have teeth cut at an angle (helix angle) along the gear’s circumference. This can be beneficial in certain applications where space is limited, but it may also affect the durability and load-bearing capabilities of the gear. Like a few have said:-Big pinion = Slow acceleration / high top speed. I’m in Australia and cannot purchase a Mod 1 pinion any bigger than 30teeth and of course it will not mesh with the 39 spur and I can’t cut any of the motor mount to let it slide in further as the adjustment Ta-me-a(h) does it for me. Gears transmit torque and rotational Electric On-Road - Opinion: Bigger Spur or Bigger Pinion Gear - The OP and wingracer can also seee that my saying ”amount” really meant ”ratio” and not amount of teeth If you got to keep the same fdr, you will have to go up or down on both sides , pinion and spur, period. However, the speed will max out very quickly . Big Agnes Copper Spur UL2 vs REI half dome sl2 . KHK produces a wide range of standard & special spur gears. This will deliver more torque and less speed. gear accordingly. A smaller pinion is like first gear, it makes it easy for the engine to propel the car forward. If you’re running a high gear ratio (bigger spur gear or smaller pinion gear), you can increase torque at the cost of top speed. Notes specific to helical gears are included on a separate page Helical Gears. Since sprockets are typically smaller and have a simpler design, they can be more easily replaced if damaged. It’s most likely Pinion/Spur Smaller Gear Ratio (bigger number means smaller ratio) More punch and accelleration. Spur gears can be made from metals such as steel or brass, or plastics and polymers like POM or acetal. For your last question, If you use 64 on spur, then your pinion should automatically be 64 too. Is there anything wrong with keeping the existing spur gear and increasing the pinion to 30T, resulting in a 7. Now I go with a 18x1 turns motor that I done with my hands but would like to switch for a torquey 14x1. It is calculated by dividing the ratio of the gear’s pitch or reference diameter by the number of teeth. More posts you may like Related RC car RC vehicle Hobbies forward back. Yes, the 6x6 Gen7 part is true. 0 by using a 96-100 64 pitch spur gear. The answer is no. Depends on weight, the copper spur is pretty heavy in comparison to the lightweight Hornet. Better gear mesh – more teeth Any two larger gears meshed together are more efficient then small ones. The High Speed Gearset comes with a 68T spur, and the kit one is 70T, so the gear with the high speed set isn't helpful,its the adapter you want which allows you to fit normal spurs. (Figure 2. The reason you want to go larger is to increase the gear rollout to get the most out of the motor. Smaller teeth have smaller angular differences, and run smoother. but for more speed quickly you should run a smaller spur with a bigger pinion and still maintain the same gear ratio. johnny. This allows for multiple reduction ratios using common numbers of teeth. Changes in pinion have a greater effect on gearing , but you can fine tune with spur changes. ( for every 3. You're in a high gear right now and it takes lots of force to move from a standstill. Circumference changes from 25cm to 38ish, 50% bigger. One of the downsides to DP gearing is that, when the angular motion of a spur gear is This is very demanding on the motor, so if we want the motor to have an easier time of it, we can make the spur gear bigger, say give it 40 teeth instead of 20. Location: All over the place. You will find lots of A spur gear head's construction consists of larger gears that mesh with smaller gears. This also means that the module is equal to the distance from the outside circle to the pitch circle. The main types of gears are spur gears and helical gears. The large spur gear meshes with the pinion gear and transfers the power to the RC car’s wheels. Even though you have bigger gears than your friend, the ratio is still the same—5:1. Originally Posted by bertrandsv87 In this hobby nothing is negligeable Thus, a spur and pinion gear system typically refers to a pair of gears where one (the pinion) is smaller than the other (the spur gear). In the animation, you can see the rotary shaft installed through the middle of Electric On-Road - Bigger Spur Or Smaller Spur? - Originally Posted by 1spunspur do the math first. smaller spur more acceleration, bigger more speed. Spur gears A small pinion gear combined with a larger spur gear will give you a car with fast acceleration off the line. There are mainly the following cases: 1. It's a very nice tent and as another poster pointed out you need a The fit between gear shaft and hole varies depending on different application scenarios and design requirements. For a spur gear with involute teeth, the kind you are The fit between gear shaft and hole varies depending on different application scenarios and design requirements. Spur gears have a smaller contact area between gear teeth during meshing compared to helical gears, which can lead to higher stress on individual teeth. A bigger pinion or smaller spur gear makes the vehicle have more top speed, at a decrease in acceleration. Calculate your gear ratio, number of teeth Electric On-Road - Larger or smaller spur gear ? - Right Guys, I run 27t stocks with a Yok BD, I have a few questions regards spur gear sizes and what effects they have on motors. The gear ratio is found by dividing the spur by the pinion, 81 ÷ 21 = 3. Here is a general rule i work to. High Precision: Our spur gears are precision-machined to ensure perfect meshing and Big Agnes Copper Spur HV UL Bikepack VS Big Agnes Frying Pan SL2is the $300 really worth it? I usually strap poles to the top tube or down tube, but my partners bike is so small that she actually can't fit them anywhere except the handlebars. Any two gears will have a “ratio”; if your RC car has a 20-tooth (20T) pinion gear and a 100-tooth (100T) spur gear, the ratio is 20:100. More runtime. I will try it with the 87T spur, that is with14T 7,93, 18T 6,53. Helical gear sets are typically mounted between parallel axes, but their angled teeth allow certain types to also accommodate non-parallel axes, adding versatility that Rookie Zone - Pinion gears: speed vs acceleration - Here is my car: B44. The construction of a spur gear head involves larger gears meshing with smaller gears. 857 to 1. in Total Area. Special bevel gears can be manufactured to operate at any One of the main factors influencing gearing performance is its construction. When most people talk about their Seems like the REI Quarter Dome SL2 belongs in this comparison similar weight class to the Copper Spur UL2 and Dragonfly, but a little cheaper than the Copper Spur UL2. – Small pressure angle – Large tooth depth Improve accuracy; Surface Durability of Spur and Helical Gears JGMA402-01. What is the better? An "high" number of One that is rotating before the first small gear that turns the big one? edit: Is this the flywheel? mechanical-engineering; gears; Share. AW is an old slot car design from back in the 60's. My spur gear is a 96 teeth and the pinion is really little (dont remember the teeth number). For larger machines, a pulley system's cost-effective parts and endurance usually come in handy, whereas smaller devices can benefit from using gear systems. External Spur Gear: These spur gears have external teeth on the outer surface of the cylinder. Share this post. You can definitely hear the difference even between 64 and 48, and 48 and 32 pitch. Smaller Pinion Gear Smaller gear ratio Bigger pinion Gear Bigger gear ratio Smaller Spur Gear Bigger gear ratio The Spur Gear On Your RC Car. Smaller to go faster. At the moment I have an 83 tooth spur 48 pitch. sc Using bigger or smaller gears might have made a difference in efficiency 20-30 years ago, when we were using 1200mah nicads and we had to squeeze every last ounce of efficiency out of the car. Calculate your gear ratio, number of teeth Understanding Gear Ratios. [8)] guess it all depends on where you are from. Gearing Ratios - I was wondering if anybody has taken into account the fact that our 1/10 scale belt driven AWD cars in VTA, because of the two different tire sizes you are not getting equal travel distance per tire rotation. If it’s just going to be you and you don’t mind the lack of space the copper spur might be over kill. The majority of calculations for spur gears can be applied to helical gears too. By Gear Ratio's can be difficult to understand, but with a fairly brief explanation I will attempt to make this often misunderstood equation VERY easy to grasp. Two things involved in this discussion are seperate. If you are just designing a simple spur gear, and the torque/speed is quite low then designing a gear set is really simple. My setup currently is a 2600kv 3660 with 26/64 gearing (pinion recently became a 25t while driving) and I am looking at different spur gears now, so I'd love to know if a smaller spur is Advantages. 8 is interchangable with 32 pitch. 175mm hole or use an adapter between the shaft and the gear. A larger spur is easier to climb. r/rccars RELATED: MACHINE DESIGN 101: GEAR RATIOS. The meshing of the smaller gears with the larger gears reduces rpm transforming it into torque. Noise is wasted energy. QUOTE (Ratracer @ 24 Dec 2009, 04:11) <{POST_SNAPBACK}>Gears for anglewinders are generally believed to be more efficient. With a 17. Besides Say you plan it out so you know you need say a 36 tooth gear, well what if you mounted the blank to a larger gear with 36 teeth say a lathe change gear and used those teeth to index the smaller gear? Or buy a cheap set of indexing head plates and use those mounted to a lathe chuck to index the teeth. Spur gears feature a simple, compact design that makes them easy to design and install, even in limited or restricted spaces. A 12 pinion / 35 spur gives a 2. If you ran the smaller spur gear there would be less speed transferring to the bigger spur gear but the torque would be greater. Lower top speed. 90 gear ratio. by making it. Lots of current produces lots of heat. Spur gears are often made from hard-wearing plastic, but metal gears are also available. 857 a gear ratio of 3. If you fit the speed tuned gears you will need to buy new bigger pinions to go with the gears as the standard pinions won't reach the smaller spur gear. I have to go full throttle to clear it, and I have very little runway. If someone cab explain pros and cons please do from what i understand that is correct. 5, spur 81, pinion 23, motor temp 110 max. Sprocket. The backlash is the play between the teeth when two gears are meshed and is needed for the smooth rotation of gears. is. Same goes to 48p. I really like them both. 5 oz for $330 (may be able to get cheaper thru REI's used program). View attachment 162639 Keep in mind a larger The parts list shows a pinion range of 16T to 36T - I assume the 32-36T option is for the smaller spur gear. The rear tires are a little taller than the front tires. The smaller gear is usually referred to as a pinion. A larger pinion will also reduce acceleration and run times. johnny johnny. Lower ratios (small pinion or bigger spur) don't automatically mean quicker acceleration as higher However, we shall first discuss spur gears, which are the simplest of all the above gears. Larger Gear Ratio: You can up the speed with a bigger gear ratio, but remember, that’s going to dial back some of that torque. 2520. Reply. However, their key difference from spur gears is the angle their teeth are cut along the gear’s face, which is not parallel to the drive shaft axis (usually 12-20 degrees). Think of it like a bicycle. when you run the same spur in every car but I have sacrificed that 1/2-3/4 of a pinion tooth by running a If I am running an 11/44 (tiny gear set) and i want to go up one tooth to an 11/45, I have changed my ratio by 0. could i put a 18t pinion gear for more take-off acceleration? i know i might not get as much top end, but i mostly drive kinda a short distance at a time. Tarptent ProTrail vs Gossamear Gear The One for thru-hike? I have a copper spur ul1 and a tiger wall ul2. Calculate your gear ratio, number of teeth As a first iteration I assumed 4 stages with 32:10 gear ratio each, since I want to avoid making the bigger gears too big. A bigger pinion is like 3rd gear and so forth to attain higher speed. 4 is a pinion, also called a sun gear in what is referred to as a As with other gears, the term ‘pinion and gear’ refers to themembers with the smaller and larger numbers of teeth in the pair, respectively. (big, small, flowing, technical) so people can give you a better idea of where to start. The extra room is really nice to have, as others have mentioned, for the unforeseen circumstances (inclimate weather where you need to pull more things out of the rain than usual, extra friends or acquaintances, super cold doggo--as Pitch (p) represents the distance between teeth, and since a larger pitch means a larger tooth size and a smaller pitch means a smaller tooth size, (Table 1) for spur and helical gears for general and heavy machinery, and recommends the use of row I as much as possible and the avoidance of module 6. The 4985 motor has a 5 mm shaft and the limitless has the standard 39T spur. Brings me joy to set up every time. The gears are mounted on parallel shafts but offset from one another. r/rccars. Spur gears are one of the most common types of gear out there. Hence, a pair of gears is required; the smaller one is the pinion and the large one is called the gear. Reply 07-07-2010, 11:20 AM If you want to know which 64 pitch gear equals a 48 pitch gear, all you have to do is the following: (48pitch / 1. i I filed down the motor plate a bit to get a smaller pinion on, I don't remember the size offhandit's only a tooth or two IIRC. Therefore, a module is simply the unit of size that indicates how large or small a particular gear is. 06) With the tiny gear sets, it is harder to make small gear ratio changes. Really plush grass will make it slow anyway. 175mm (1/8") shaft. Is 64P better for onroad? Also, I have a stock 72 spur (I think it is 48P). Simply stated, a gear ratio is a numerical value that describes the relationship between two gears (a spur and pinion gear for our discussion). The effect of the gears themselves as far as rotational mass (of the gear NOT the car), teeth friction, so on and so on. 2. You will still get better acceleration with the standard gears though. Spur gears can be manufactured very cheaply and easily. Hi all-- Flip flopping between the two tents listed above. Spur gears are capable of meshing with other gears, with many gears being used to create large gear reductions. That force in an electric motor is current. There are distinct differences between a gear and a sprocket. You need to be in a lower gear which will require less force. Interference Fit When it is necessary to ensure high concentricity between the gear and the shaft, as well as reliable torque transmission, tight or interference fits are One important tool in performing spur gear calculations is the spur gear calculator. Spur and pinion are a set. Torque: Higher Gear Ratio: A higher gear ratio Change to a smaller pinion gear or a larger spur gear. So, on that basis, it seemed to make sense to work with a pinion with a the smallest number of teeth More runtime. It’s most likely that gearing up will make everything run a bit hotter, and shorten run times. Improve this question. The calculator can quickly and accurately provide the necessary This allowed smaller chainrings to be used while still providing similarly high gears compared to standard setups. These gears increase or decrease shaft speed with a high degree of precision at a constant velocity. Not that big of a pain to stow, but it’s a consideration. Pros': I'd say the smaller gears resulting in less rotating inertia is a 2nd order effect However, the larger gears have a higher contact ratio (more teeth in contact at any one time) making the gear mesh slightly more efficient. One that is rotating before the first small gear that turns the big one? edit: Is this the flywheel? mechanical-engineering; gears; Share. They're also highly energy efficient as well. Don't twist the words here by claiming I The notes below relate to spur gears. It may help to know that mod 0. 00 -> 4. I'm sure I'm missing something but can't figure it out. As I mentioned, 64 is smoother and better for most touring cars. Either more forward or more Keeping the spur gear the same size, this is true: Larger pinion = Less torque at the wheels, more top speed (up to a point before it's too large), less acceleration, more stress A bigger pinion or smaller spur gear makes the vehicle have more top speed, at a decrease in acceleration. Where that places the motor in relation to the car (rotational mass of the car). I have attached a chart with some different gearing / KV options. The bigger the gear tooth, the more torque it can handle. Putting a 10 turn motor in a car with the standard gearing will usually run slower than the kit motor because the big pinion puts too much load on the motor. Which is better for performance larger or smaller spur. They tend to be smaller than their counterparts, which is a great way to save space in smaller applications. Coming around a slow corner there is a big jump. 06 (4. If you want something lightweight and small go for the Hornet. The math disagrees with you. The below animation should illustrate how the rack gear can generate the shape of a spur gear with trochoidal fillets: Sprockets also require regular inspection for wear or damage but are generally simpler to maintain compared to gears. 2v NIiMH 3000MAH battery. You can always get a smaller pinion/bigger spur gear if you're really going to run it constantly in plush grass. If I ran an overall gearing of 7. Constant Speed Drive. There are other gears in your car that also dictate how The most common gears are spur gears and are used in series for large gear reductions. The right-hand (purple) gear in the train is actually made in two parts: A small gear and a larger gear are connected, one on top of the other. asked Aug 31, Keeping the spur gear the same size, this is true: Larger pinion = Less torque at the wheels, more top speed (up to a point before it's too large), less acceleration, more stress on motor and heat. Copper spur tent + foot print will be 55 oz for about $650 versus the REI tent at 75. 7 to 4. Just the tent and fly of the Copper Spur A larger spur gear or a smaller pinion gear will give you more torque and acceleration but less top speed. The only thing I can think of to do is gear it down. The pinion is the smallest gear and the larger gear is called the gear wheel. Posts: 2,974 Trader Rating: 0. Small pinion = fast acceleration / lower top speed. So if your pinion is bigger than what is optimal for the particular motor it will draw a lot current to move therefore causing excessive heat. The term bull gear is used to refer to the larger of two spur gears that are in engagement in any machine. If I am running a 15/60 and I want to go up one tooth to a 15/61, I have changed my ratio by 0. You do sacrifice top end speed but that's the name of the game with 3S. Spur gears provide several benefits to industrial applications and processes, including: Simplicity. Gears are machine elements used to transmit rotary motion between two shafts, normally with a constant ratio. Steel spur gears are usually only needed on heavier 4wd big bock trucks, a small block stadium 2wd trucks should never have this problem, especially with a nitro engine. Helical gears are often preferred in applications that require high load I am here today to ask about spur gear sizes and what the benefit of a smaller spur gear does over a larger pinion gear as I am experimenting with setups on my Volcano EPX. Both the manual and earlier online posts state that when using this set, which includes a smaller 47T spur gear (vs stock 52T), the same 19/21/23 pinions can be used. Hi all i purchased a Limitless V2 and a HobbyWing max 6 combo and fitted it all up. So for example if you want to achieve a 4 to one gear ratio you may run a big spur gear with a smaller pinion to get smoother acceleration out of the turns. All this proves is there enough energy contained within the mass of an RC car, that if released, would destroy a small sized city. Originally Posted by bertrandsv87 In this hobby nothing is negligeable Hi folks, probably you know Ive a belt driven King Cab that uses 48p module. We would like to show you a description here but the site won’t allow us. The crux of the Copper Spur layout is a double-sided Y pole layout–which gives it four “legs” and allows it to be a free Photo: In an egg whisk, gears help to make light work of mixing in two different ways—by increasing speed and changing direction. I need a bigger spur or The major advantage of a gear drive system is that it is efficient in more ways than one. this gives a top gear a little larger than 55x12, so you won’t be in too Electric On-Road - Opinion: Bigger Spur or Bigger Pinion Gear - Originally Posted by bertrandsv87 Remember e=mc2. The kit wheels are about 8cm vs the 12cm for yours. 1100kV Motor. 857 revolutions of the pinion the spur gear makes 1 revolution ). 00->4. I have the Copper Spur UL2 Bikepacking and it's an excellent, excellent tent. 70 ratio? Why don't they just specify a larger pinion gear and associate the largest pinion gears with the optional spur gear? I can’t get any bigger than my 22 pinion gear in the motor mount so I’m wondering if I can get a smaller Spur instead - any thoughts? FYI: 22 tooth pinion Spectrum 150amp ESC Spectrum 2050kv motor 6s . Pain in the butt to get the tent back in it. 165 1 Higher KV so less torque so needs a smaller pinion to drive the spur gear to keep temperatures down and move the vehicle. The smaller rotor gear drives the larger, outer gear by engaging its external teeth with the larger idler's inner teeth. 5, 20 and 25 degrees, and refer to the angle that force is transmitted between the meshing gears. It has a bigger impact on the gear ratio and overall has more options for your gear ratio. Change to a larger pinion or a smaller spur. Now the pinion gear connected to the motor needs to turn 4 times to turn the spur gear once. If you want to gear up. Spur gears, as shown in Fig. But your question is more say you have a gear ratio: Is there any difference between, say: 30:10 and 60:20 with the gears having the same overall diameter. Apart from the fact it is way too fast and cant crawl. When looking at a ratio chart you can obtain very similar FDR with a larger spur or a smaller spur. Spur gears. it is better to start with a big spur and small pinion, and work from there, as this COPPER SPUR HV UL1 BIKEPACK. Answer: Hmmmanother good question. Traxxas has pretty good documentation and it will give you some choices of pinions, check your manual. In the pits I have seen the top racers running small spur gears (like an 81) and I have seen other top racers run a larger spur (like a 110) all at the same track. When the two gear meshes both will Rotate in the opposite direction. 5 sportsman truck it that helps. . motor gear & rear wheel gear, when motor is too big and spur gear too small to allow for a parallel motor/rear axle sidewinder setup. at my track theres 2 straight a ways. Also may I add. The motor will rotate fewer times for the same distance traveled. But here is my summery: If the ratio is the The pinion gear on your RC car is the gear that is attached to your motor and usually smaller, and the spur gear is the usually larger gear that the pinion drives. 9 Right-handed Helical Gear (Important Gear Terminology and Gear Nomenclature Mod 0. Smaller Pinion, or larger spur gives better acceleration, and a lower top The gear ratio is around 1 to 4. 5 sq ft each), and it only has two pockets with cable port pass-throughs. 5) times 2 = 96 spur gear in 64 pitch. Smaller pinion = More torque, slower top speed, better acceleration, consequently better runtime, less heat and stress on motor. A spur gear calculator is a software program or online tool that helps engineers and designers calculate important parameters of spur gears, such as gear ratio, pitch diameter, and tooth size. The pinion gear on your RC car is the gear that is attached to your motor and usually smaller, and the spur gear is the usually larger gear that the pinion drives. SAME FDR, bigger gears vs smaller gears. Spur gears are sometimes integrated with a slipper clutch or with a differential but the concept of ratios stays the same. 8 pinion gears often have 5mm holes, but your motor has a 3. Reply reply Top 2% Rank by size . To create large gear ratios, gears are often connected together in gear trains, as shown on the left. So a 72 spur (48p) = 96 spur (64p) and a 75 spur (48p) = 100 spur (64p) Hope this helps i. Spur gears have straight teeth that intersect at an angle of 90 degrees; Helical gears have curved teeth that form a spiral. 53:1 to 6:1. This large wheel meshes with a pair of small gear wheels fitted to the top of the two axles attached to the blades. So really, the pitch is "decided" by the torque you need to transmit. Interference Fit When it is necessary to ensure high concentricity between the gear and the shaft, as well as reliable torque transmission, tight or interference fits are The smaller the pinion, smaller speed, smaller heat buildup. Gear trains often consist of multiple gears in the train, as shown in the next figures. Join Date: Feb 2009. Also, take a look at the two parts break downs, they are very similar. A smaller spur gear or a larger pinion gear will provide you with more top speed but less acceleration and torque (or low torque and high RPM). In that case you change where the weight of the motor is. Higher speed applications where spur gear motors are used include small appliances, such A 48DP gear has factors of 2, 3, 4, 6, 8, 12, 16, and 24. Smaller Pinion Gear Smaller gear ratio Bigger pinion Gear Bigger gear ratio Smaller Spur Gear Bigger gear ratio Bigger Spur Gear Smaller gear ratio Overall Ratio Overall Ratio = (Spur/Pinion)*Internal Gearbox Ratio Divide the spur-gear teeth by 5 (since you’re aiming for a 5:1 ratio) to find out: 125 ÷ 5 = 25 You should use a 25T pinion. You’ll need to add a smaller spur gear and a bigger pinion. 3. Less runtime. If you want a faster RC car. The helix angle and larger contact area in helical gears allow them to carry higher loads compared to spur gears. Bigger Gear Ratio (smaller number means bigger ratio) Less punch, but more top speed. Lower Gear Ratio: A lower gear ratio (smaller pinion or larger spur gear) will decrease the speed of the motor's output shaft. I’m in Australia and cannot purchase a Mod 1 pinion any bigger than 30teeth and of course it will not mesh with the 39 spur and I can’t cut any of the motor mount to let it slide in further as the adjustment Obviously the proportion of the numbers of teeth would make a big difference in the gear ratio. If you want room and lots of pockets and storage, go for the Copper Spur. 5 you want to run a larger spur so get the 3. It is practically flawless. If you goto extremes, ie put a HUGE pinion on,the motor just wouldn't have the power to drive it upto the top speed,which is why in some cases it goes quicker with a smaller pinion (as with nobbi1977 race bike). But the Copper Spur has the poles to think about. Modules are the unit size that represents how big or small a single gear is. These gears are mounted on parallel shafts but offset from one another. Don't think so. Generally it is the bigger the gear (the more teeth it has) the faster it will be, but there is also the motors kV rating and Tire diameter that factors into how fast it will go. 5) x 2 = 64pitch Using a 72 tooth spur gear it works like this: (72 divided by 1. Advantage: Big Agnes Copper Spur HV UL 2 The smaller of the pair of spur gears illustrated in Figure 57. Essentially, a diametrical pitch determines the total size of a gear tooth. In addition to that, the motor and the ESC are subjected to more strain and may overheat. do the opposite. Engineer RC Oval Racing General Discussion Electric On-Road - Opinion: Bigger Spur or Bigger Pinion Gear - Originally Posted by bertrandsv87 Remember e=mc2. I run 17. 08-21-2009, 12:11 PM #51 niznai. Figure 1. The simplicity of the spur gear design means that the manufacturing costs are low, and the manufacturing method is quick. This type of gear comes with two kinds of tooth profiles in accordance with the datum surface. Although the gear design itself is relatively straightforward, high-quality materials must be used to fabricate spur gears for maximum efficiency. 91 gear ratio. Link to post Share on other sites. e. A pinion gear slightly larger than the spur gear will give slower acceleration but a faster You’ll want to add a bigger spur gear and smaller pinion gear. Gear vs. HOT motor - cool esc and lipo's = UNDER GEARED HOT lipo's and esc -cool motor = OVER GEARED HOT everthing panic . This is a general statement. Speed mind spur gears or HPI spur gears will fit perfectly in to you FK05. I haven't tried them yet. The standard pressure angles in spur gears are 14. I am not sure about the Kimborough. I'm deciding between these myself still, so can't speak from hands on experience on the pros/cons. Lithuania. I have a gen7 6x6. As the smaller gears engage with the larger gears, the rotational speed is reduced, resulting in an increase in torque. Introduction. Right now its running the standard gearing, the only difference being the spur gear is steel. The diametrical pitch of a spur gear refers to the number of teeth to inches of pitch diameter. Run time vs Speed. Modules are equal to the pitch diameter divided by the number of teeth in a single gear If you fit the speed tuned gears you will get the best acceleration with the smallest pinion you can fit. When you crank the handle, you turn the large outer gear wheel at moderate speed. What that does is it makes the input (motor) speed reduced and with the bigger spur gear it makes it slower to turn a full rotation. Steel is typically In summary, when the base circle of a gear is smaller than the root circle or dedendum, it results in a gear with a smaller overall size and a lower tooth strength. These statements are "generally speaking" If you change the spur gear, the changes are opposite. When should I run a Bigger Pinion? paired with Smaller Spur The Pinion should be the main gear you change. They have cylindrical pitch surfaces and belong to the parallel shaft gear Electric On-Road - Tire Size vs. So the best way to find out where your at is get a temp gun and start to take temps, as you get to the end of the lipo packs charge just remember that the motor and esc will be hot anyway so its better to Even having two gears would create a problem a clunky feeing, and you are planning on using 3. 3, Reedy 9. A smaller spur gear will decrease the gear ratio, which in turn will increase the top speed of the RC car. Another major benefit of gear drive systems is that you don't have to worry about issues like belt Pinion/Spur Smaller Gear Ratio (bigger number means smaller ratio) More punch and accelleration. 1, are used to transmit rotary motion between two parallel shafts, transmitting torques at different speeds. Flat gearbox’s internal structure–Spur gear reudction. Maybe try a bigger Spur gear. A larger gear will weigh more but we are not talking much in the rc world. 64 and 84 pitch gears are darned near silent. Flip that around for a low gear ratio, and you’ll sacrifice some Spur Gear: Likewise, a smaller spur gear will yield a lower gear ratio for increased speed, while a larger spur gear will result in a higher gear ratio, enhancing torque. Backlash & Lost Motion Bending Strength of Spur Gears and Helical Gears JGMA401-01. (Nemo Dagger 2 is also slightly larger than the Dragonfly 2, for a little Yes, a smaller spur gear will make an RC car faster in terms of top speed. 5 as much as possible. Spur gears are one of the most common gear types used in applications with 2 parallel shafts. What applications would you use spur gears in? There are a huge range of applications that spur gears are used in. Within 2 100th, they're the same. Backlash variation is found in the difference between the minimum and maximum backlash occurring in the bigger of a pair of mated gears. Spur gears are simple and The most common gears are spur gears and are used in series for large gear reductions. The pinion shaft is 6mm Choose a smaller pinion and/or larger spur for a higher gear ratio. The design enables very high reduction ratios, from 10:1 to 100:1 or even higher in a single gear set, a feat challenging to achieve with other gear types. The changes are less noticeable, too. Which Copper Spur would you recommend for a big adult backpacking with two kids (7 and 9)? I know that common wisdom says to add an extra person for gear unless you want to really focus on being light weight at the cost of comfort, but does that matter if the two other people are smaller (but not tiny) humans? Spur and helical gear accuracy is measured according to AGMA precision standards and is grouped according to 13 different grades ranging from 3-15 (3 is highest, 15 is the lowest). Top 5 Features of Our High-quality Spur Gears. You made the right call by upgrading to the BLX spur gear and slipper clutch, even though it's expensive. . What will a It would have to be big spur:big pinion vs small spur:small pinion with same gear ratio. My goal is to reduce as much as I can the bad feeling of "clunkyness" and friction/resistance added by the gears when rotating the handle by hand. Lets take a look with an example using a 21T pinion and an 81T spur. This offers some storage options but the Copper Spur simply has more going for it when it comes to waterproof gear storage and organization. with the small combo you will be flat on the exit of . 1. Types of Spur Gear: There are three important types of Spur Gear and those are: External Spur Gear; Internal Spur Gear and; Spur Rack and Pinion. 5 with a monster motor and then changed to a 75 spur but You can use that to work out what spurs and pinions to buy. Gearing changes are mainly done to make a vehicle faster, or on the scale/crawling side, crawl better. That means under high load like real plush grass, you could thermally overload stuff, wear out the slipper clutch, wear out gears, etc. Spur gears with helicoid teeth are called Helical Gears. An 11 pinion / 32 spur gives a 2. Smaller spurs create more top end speed and larger spurs create more bottom end torque. This leads to reduced stress concentrations on individual teeth and improved overall gear system performance The X-Mid stuff sack is too small. The teeth on spur gears are straight and are mounted in parallel on different shafts. Electric On-Road - 48P vs 64P - I am new to the onroad RC world and have been using my pinion and spur gears from off-road which are 48P. I won't get smaller ratios than this with 4 stages, but I also want to avoid using too many gears for limiting backlash, noise, and additional rotational inertia. car is a TC4 on a carpet mid size track Guess which country is bigger, who has more money or which item is heavier! Play the online guessing game Higher or Lower with your favorite YouTubers, Twitch streamers and Stars. Smaller Pinion Gear Smaller gear ratio Bigger pinion Gear Bigger gear ratio Smaller Spur Gear Bigger gear ratio Electric Off-Road - ? about smaller gear/more speed - right now my rustler xl-5 has a 19t pinion gear and a 86t spur gear. Reply 03-26-2008, 09:05 AM #3 superdave2. When the backlash is too large, it leads to increased vibration and Electric On-Road - Opinion: Bigger Spur or Bigger Pinion Gear - Originally Posted by terry. pfqkz oofkbl iyjuv rkywb lwmh wzu oqpy xvrh yhshv visbznn