We are working on a second iteration of our shooter for our second district which we hope will feature a variable hood. We hope to rotate the hood with a servo on a large curved rack on the backside of the hood as many teams have done over the years. Because of our design, we need a tooth count higher than the solidworks gear generator can yield. Does anyone know of any sources of cad for 20 dp gears with tooth counts over the 350 range/how to generate such a gear profile?
I haven’t tried generating anything that large in OnShape but whenever I need to generate a gear, I use the OnShape FeatureScript for Spur Gears: https://cad.onshape.com/documents/5742c8cde4b06c68b362d748/v/c65839fc6078faeb4d2aece1/e/5e653835ca09dd3451bd9e3b
I’m not sure what the limitations of this gear generator are, but maybe it could work for your application
We used Fusion 360 to generate a 375 tooth gear for our hood this year. There is a built in gear generator in the add-ins section. I don’t think there is a limit on the number of teeth it can generate, but it can take some time to generate the profile.
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We very regularly use the CAD gear generator on https://www.rushgears.com/
You can create gears with any pitch and tooth number you like. Along with changing other variable such as pressure angle and bore dimensions.
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Autodesk Inventor has Design Generator tool for it. It works fine but the input screens are fairly confusing
Just did one for 999 in inventor But if you make the gear yourself (3dP??) then you could change the module. biggest gear we did so far was about 9 in but we used a module of 4mm but decided to go a different way then due to us running out of time
If using solidworks, you can use the spur gear toolbox component.
+1 for the fusion 360 gear tool.
I typically use Creo, but you could do a smaller section and pattern the features to extend it.
This would require quite a bit of math if you wanted it to actually be a 20 dp involute gear profile, not just a gear-looking-thingy. You’re better off using an external program to generate it and then import it into your CAD program.
Thank you everyone for the suggestions. I will put this up for future reference in case anyone ends up searching for such a resource. I ended up using this gear generator on grabcad which rtomp of 2168 showed me. It creates any gear with any tooth count through solidworks equations which was perfect for my use case.
I will note that designing gears manually is not that hard, especially ones with a high enough tooth count. This tutorial is really good, although I recommend that you leverage SolidWorks’ built-in equations to make the design easier to modify.
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