We have several design changes to make. This is a proof of concept build. I haven't even tightened all the bolts.
This will be a direct drive grinder. The advantages are: less power loss due to reduced drive train friction, less noise, less vibration, smoother power flow (with the right motor set up), easier build with a standard 56C face motor (very common).
The disadvantage is you can't use low cost step pulleys for speed control.
We are using high quality Beaumont Metal Works drive and tracking wheels. Wheels can be premium quality Beaumont or lower cost poly.
A swivel arm eliminates all the tool bars...or not. I could easily see multiple swivel arms with different size wheels.
Left to design:
- a tool rest we will add another slot just under the swivel arm slot
- an optional small wheel attachment. This may require dismounting the entire swivel but we have not given it any thought yet.
- an optional mounting pedestal for the speed controller if you are going with an external speed control.
- a one hand method of tightening the swivel arm in place when pulling the arm to tighten the belt.
- standardized nuts, bolts and sourcing
- tension spring selection - most won't like the doubled over door spring I am using here in this build.
- review the fastening method of attaching the vertical plate to the base plate. currently it is held by 3 bolts threaded into the vertical plate.
Changes to this design noted during this build:
- standardizing some hole sizes
- moving a couple hole locations slightly
- lengthen the tracking arm swivel block
- lengthen back of tension arm for additional spring tension leverage
- change base plate dimensions - the whole thing tips to the front now. We will need to narrow the plate and make it longer so it won't tip forward.
- counter sink holes on the swivel arm for bolt clearance
The belt side.
Motor side.
The name I am now using is Samgee for Swivel Arm Metal Grinder.
Any suggestions on any part of this would be appreciated.