Comments sought on new build: A CNC Router for RC Gliders and Planes

[njhussey]

Did a bit of machining today. Machined 2 x countersunk holes to suit M8 bolts on the Z axis back plate to take the Y axis ballnut bracket.





The Y axis ballscrew will fix straight onto the back of the gantry so won't need shimming.





Scratched my head a bit today trying to work out how to mount the Y axis stepper motor so I can adjust it to tension the belt. In the end I've decided to put the pulley on the rear of the stepper and mount the stepper on the front via a bracket...





I'm hoping that as the only tension on the stepper is from the belt that this arrangement will do?

[toomast]

Nice build sir!

I don't have first hand experience mounting stepper motors this way but it looks trouble. Maybe too much strain on motor?
I guess as long as you fabricated the mount you might as well run it and find out.

Do you have special machining on ballscrew? I notice longer area for the pulley? Or is it just my eyes...

[JAZZCNC]

Scratched my head a bit today trying to work out how to mount the Y axis stepper motor so I can adjust it to tension the belt. In the end I've decided to put the pulley on the rear of the stepper and mount the stepper on the front via a bracket...

I'm hoping that as the only tension on the stepper is from the belt that this arrangement will do?

Bad idea that dude.!! Bearings will suffer and could cause resonance which will affect motor. Just pocket the Mount deeper so pulley goes thru it.
Or have idler arm tensioner tension belt from side of gantry.

[Jonathan]

I agree with JazzCNC - loading the stepper motor bearings so much wont end well...