I’m happy to finally be publically posting my second complete Onshape model Generator!!
The link is here:
This generator is an idea I stole from Marshall from 900, it’s a CAD generator intended to design custom single stage (multiple stage capability coming soon) gearboxes from just input of Tooth count of your Driven/driving gears, and gear pitch. Right now, it’s designed to use CIM mounting holes just cause its super easy to run the CIM pinions from vex in this type of gearbox, however it is super easy to change to a 775pro (or whatever other setup) with the 32 dp gears from WCP and if people want I can release that one too.
The model is adjusted via the variables on the left hand, and as always with some back end featurescript to make sure the file doesn’t play itself.
For this project, I thought it would be cool to design an entire gearbox, not just the plate. So in “complete gearbox” you will find the gearbox mocked up (big circles represent OD of gears), or if you just want the raw plate you can find it in “raw plate”.
I’m having a great time and learning a ton from creating the generators, and have a bunch more “done” (ironing out bugs) to be posted in the near future. If you have any specific requests like some people have pm’d me with, feel free to respond with them in this thread and I’ll do my best to make it happen!
Thanks for reading to the end of my rant, and happy gearbox generating!!
That said, I don’t think lightening patterns should be done automatically. They have a few more variables that depend on the application and the loads.
Also, the pictured lightening pattern is a bit on the skimpy side - I’d probably add a vertical bar connecting the output and the mount, and another bar on the other side of the CIM just to be safe. I’m generally really conservative with lightening.
Very nice design.
I’m looking forward to seeing a 2 motor 775 design.
I’m not sure you are looking for suggestions, but I would like to see more aligning connections between the 2 plates to insure the bearings line up.
Maybe a bolt with a standoff that replaces the CIM attaching bolt.
Also increase the height of the plates to allow attachment above the mechanism as an option.
2nded on the bolt + standoff, that will add a lot of stiffness too.
I’m not sure why I would increase the plate height. Why not just flip it over then? It looks like it’s invertable in multiple ways.
Really cool generator. OnShape has a lot of interesting features in it it seems like.
What a great idea! I updated the document with generated spacers to align the shafts better and added 10-32 x 1.75" screws to hold it all together. I’m still looking for suggestions for this gearbox or future projects, so please let me know if you have any other ideas for improvements.
About your first thought, I can’t really think of a good application for a single stage reduction running 2 775pros. I’d be happy to design one with a little more detail, but there isn’t a great case in my mind where you could use 2 775pros in a standardized gearbox with just one stage of reduction. A climber probably has more like 30-60:1 of reduction which you would do in 2 stages or a versa planetary, intake rollers shouldn’t need more than 1 775pro, and a shooter if you do decide to use 2 775pros is probably much better off using a gearbox perfectly designed for the specific application, rather than a standardized gearbox you got from some kid online.
Let me know if you have some examples I’m missing and I’d be happy to create a design.
Thanks to everyone for the awesome feedback so far!!
Keep the suggestions rolling in and expect to see some more generators coming in soon!
My idea is that this would work like a clamping gear box sold by Vex.
It could be used to power a wheel or a quick way for a low resource team to mount motors.
It could also be used with timing pulleys to adjust the final ratio.
