Ring Gear and Pinion

by Altoidian, published

Ring Gear and Pinion by Altoidian Apr 26, 2016
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868Views 275Downloads Found in Robotics


This is a basic ring gear with 54 teeth, set at 1/8" spacing. I made the hub to fit a standard 1/4" shaft on the ring gear. The pinion gear has a 1/8" shaft hole and 10 teeth.

I did not include any shaft lock recess, such as a key slot or flat or set screw holes in order to let you design your own into it. For precision, I usually bore out my shaft holes and either machine from aluminum or 3D print a new custom shaft hub designed to fit my motor output shaft and just glue or screw it into the gear model. So, the axel holes are more or less just centering holes, although they will accept standard shaft sizes as is.

My purpose for this gear arrangement is to move the bulk of the motor drive above the large wheel axel. This gear set was originally designed in order to move the wheel motor above the drive wheel axel for ground clearance. This was for a heavy duty rock crawler/ATV rover I built.

There is a disadvantage, however; dirt and debris can collect inside the gear and cause problems. Thus I made the gears rather coarse and over sized to pretty much tolerate sand and such. Still, pebbles and sticks can get in there if you are not careful.

The gear ratio is 5.4 to 1, so it is pretty low for really great torque, especially if the drive motor is a geared DC of something like 200:1. The ring gear can also work great as a turret rotator for a crane or model tank or battle ship. The over all diameter of the large gear as presented is 2.4" and the overall diameter of the pinion gear is .46".


Print Settings

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.15 mm




I use PLA filament, bed temp 50C and .35 nozzle at 215C.

How I Designed This

Gearmaker to Autocad to Cubify Design to Simplify

I use a fantastic gear making program called Gearmaker. This little gear making engine is fantastic. It lets you create any gear and exports a DXF which I then import intoAutocad and convert the drawing lines to polylines, This is very important or Cubify simply can not handle all the information. I then clean the drawing, and export to Cubify Design and build the 3D STL file, For printing, I have the standard Simplify 3D that feeds the STL info to my printer.

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I uploaded an stl file here for you to check out. the only trouble is, I do not have the original cup gear file, so not sure this is even going to fit since the hub is internal on the cup gear and the new 30 tooth pinion is 1.25" in diameter. there may not be enough clearance in the cup gear. I can make a cup gear file with the shaft hub outside and that would then clear the pinion size.

ok thank you very much i just say this today thanks i will see if the 30 tooth gear with work in the cup gear

I think I see. You want a 30 tooth 1/8" pitch, 1/8" bore pinion- or a 5:9 ratio set. Do you want a set-screw boss in the pinion. Let me see what i can do.

Sure. Are you looking for a flat spur gear? To me, a pinion gear is smaller. Tell me what you imagine your specs might be. Hub size, axle hole diameter, pitch, thickness, would you like spokes or lightening holes? How many teeth might you imagine you need? What about overall gear diameter? Would you like a matching pinion gear? What about the axle diameter for that? Would you like an octagon or a square hole for dive axel? Would you like a set screw boss? Really, these patterns are pretty easy for me to make, so just tell me what you need and I'll let you know what I can make for ya. if I have more questions...I'll ask JB

looking for about the same size but with around 30 teeth if possible the cup gear is ok im just looking for a little more movement. and thank you for your time

K2, did you get the stl file for the 30 tooth pinion? Is it workable for you? If not, a new 9:5 ratio set is possible that probably would work. If the ring gear is required for your project, I can flip the hub to the other side and make a flush interior face that should allow enough clearance for the 30 tooth to work inside.

would you happen to have a pinion gear with more teeth? i need one with 3 time this for more rotation.

love this I have wanted a cup spur gear for a while!

The file is pretty easy to make. If you need other ratios axle size, and pinions, let me know and I can post them.