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Questions tagged [gears]

449 questions
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Internal teeth involute gear pitch circles

I'm having some trouble figuring out how to design the corresponding internal gear for any particular spur gear. With spur gears, meshing is accomplished by having two gears with the same modulus (MOD) or, in the US, the same diametral pitch. The…
carveone
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How can I tell if a gear is pressed or threaded?

I recently bought my first lathe (A circa 50s PREMO, Australian built with tapered roller bearings) and the spindle has a little bit of wiggle parallel to the axis of the spindle. I decided to pull the spindle out to take a look at 'er, but I ran…
Rob M
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Preload a worm gear?

I'm designing a 5 axis CNC, and preloading my lead screws has never been an issue for me, but for the first time, I find myself needing to preload a worm gear. How is this done, and what's the best way to do it? Thanks.
Jedi Engineer
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3d model gear to fit another gear

I have been trying to model a custom gear to fit on to another physical gear. I having been using this 3d model gear generator. What I know about my physical gear is that it has: (what I believe to be a diametral) Pitch of 32 Pitch Diameter of 1.5"…
Bennett Yeo
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What is technology used to seal a gear shaft to metal frame?

I'm working on paper cut mechanism, I use gears to move blade to cut paper. I would like to get knowledge about the technique of seling gear shafts to a metal frame. It would help me in designing elements in fusion 360, the limitations and sizes…
sultan
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Gear profiles (involute and root) generated by power skiving

@Involutius contributed an article on the equations that describe the root profile of gears which are cut by a trapezoidal-profiled hobbing tool. From that article, I was able to do a slightly different derivation to get accurate curves for the…
Willie Anderson
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reducing rotational speed from gearmotor to below 1rpm

I need to produce a very slow rotational speed for a disk -- 0.25rpm, or 1 rotation in every 4 minutes. The disk is nominally 12" in diameter. It will be driven by a DC gearmotor, through a worm and gear with a 1:20 drive ratio. The slowest…
RCH
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Why do we use bevel gears?

I understand bevel gears are used in situations were a 90 degree change is required, but I can't visually understand why. Why can't we just use standard spur gears at 90 degrees, what do we actually benefit from using a bevel? Essentially I'm asking…
ApolloMission4
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Center line to centerline of pivots for two 16 diametrical pitch gears. One gear 72 tooth other 36 tooth

I have two spur gears, each of a diametrical pitch of 16. One gear has 36 teeth and the other 72. I need to know what the distance should be center line to center line of the gear set. This would be the distance between the two shafts that the gears…
Larry
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drive/driven gears

Is it possible to have a drive and driven gear on the same shaft? Rookie question, I know. I've been doing a lot of googling and sometimes I think I understand that they can, but reading the definitions, I don't understand how that's possible.
Deanne
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Why is 14.5° a commonly used pressure angle in gears?

In gearing, according to Wikipedia and Dr. Rainer Hessmer's involute gear generator, the most popular pressure angles in the industry are 14.5°, 20° and 25°, with 20° being the most abundant. I can appreciate why 20° and 25° might be common values…
Involute
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Spur gears design

I have a problem in understanding of gears (spur gears). I designed some spur gears but I don't understand how the modulus works. I saw that this modulus is some standard thing and it's calculated by diametral pitch. Do I need to make this diametral…
Stefan Merfu
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Helical - Worm Drive

Is it possible to have a helical gear and a worm gear with the teeth angled the same amount, so that the helical gear can drive the worm gear, unlike a spur gear. Can the helical gear also move the worm gear along the axle like a gear rack. until…
Recycle Bin
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Gear coupling and clearance between pitch surfaces

I have a couple of spur gears (0.4 mm module, ISO8/AGMA9 precision, 24 and 120 teeth). I want to make their backlash as small as possible. But also I don't want them to jam. Where can I get the normal clearance between their pitch surfaces (and the…
Felix
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Gears with tilting shafts

I am looking for the following mechanism: A pair of gears initially in side-by-side arrangement. The shaft of the first gear is fixed to a first plate. The shaft of the second gear is fixed to a second plate. The first and second plate are connected…
Xavier
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