This is a great idea. A single mount that can work both ways.
The adjustable idler is really only needed if the motor is fixed. If the motor can be adjusted, then you can get away with just a hole for the idler.
vs
For the clamp - I think the range of adjustments is pretty low with the holes only going part of the way. Seems like they could be added here without much issue?
A few more thoughts:
- center to center distance should match whatever most mounts are (I think 62mm and 100mm) so belts that people already have will fit.
- Pulley combinations change the center to center distance, and to keep the belt sizes in the common lengths, you would need enough adjustment room to cover pretty much all combinations. Might be worth doing the math on all of that with a chart to help determine how much adjustment the motor needs and what belts that would work with
This was something I was doing for a pneumatic wheel mount. A 425 length belt would work with the pulley combinations I was thinking of using. There are a lot more sizes for kegel core wheels (32t-60t) plus 13t-20t motor.
- Thickness of the main mount should be at least 8mm IMO.
- Optional cross braces would be appreciated by many
- A fancy way of doing that would be to turn the brace into a grab handle
- It would likely save you a lot of headache to 3d print some ideas and see how everything installs and fits up before cutting aluminum.