HI everyone and thanks for checking out my first post. I am prototyping a rotary bow for playing stringed instruments using Pololu 90mm wheels with the D-shaft fitting. All the wheels I’ve ordered so far have a beveled edge that is too narrow for my purposes, so I had a 3D file altered to create a wider and flat outer rim of 1/2" (12.7 mm). You can see that wheel in action here: Scott Hampton on Instagram: "Super jazzed about this new wheel that a friend 3D printed for me!! it’s the closest thing so far to a horse hair bow, which, as I explain in the video, is just a happy accident! #rotobow #bowedguitar #guitarviol #diyinstruments #instrumenthack #uniqueinstruments #happyaccident #3dprinting #prototyping"
I sent a message about this to laser@pololu.com and never received a response so I thought I would try here. I’m wondering if it’s possible to have some additional wheels printed to these specifications and what materials might work for this application? I found that the PETG material is better because it’s a bit softer than the original wheels, and the PETG strands have a texture similar to a horsehair bow.
I also noticed that the 3D file I found for the 90 mm wheel actually has a flat outer rim. Is that something you can buy off the shelf or just an anomaly in the design file?
Eventually I would like to develop some variable speed functionality, I was thinking using a pressure sensor but I think I need one that has more than just positive and ground leads? The controller I’m using now to control speed has three connections so it doesn’t seem like it would work with a standard ribbon pressure sensor.
Thanks for any insight you can provide!