Web Goblin cnc has begun

[Web Goblin]

Jonathan,
the y axis motor shaft was not long enough to got through the motor mount to take the pulley. I had looked at making a different mount for the motor but it was working out to be rather thin material to get the pulley fully on the shaft so I decided to go this way. I could have made it a bit shorter but I dont think it will make too much difference.
The pulleys I had at the time so went with them rather than buying new ones. If the belt does give problems and runs off I can always change them for castle ones later.
The motors are these ones from Zapp Automation : SY85STH156-4208. I ordered the 2-4 Axis Nema 34 kit 2 and went for the bigger motors. With these motors I should have plenty of torque to drive the machine around as it will be quite heavy when finished and I prefer to have the drive system over-rated a bit :whistling:
The frame extrusion is heavy walled 80mm x 80mm with 80mm x 40mm cross bars. I cant remember the exact size for the Y axis, around 340mm x 40mm I think and again the heavy walled section.

[Jonathan]

Jonathan,
the y axis motor shaft was not long enough to got through the motor mount to take the pulley. I had looked at making a different mount for the motor but it was working out to be rather thin material to get the pulley fully on the shaft ...

I see, I got round that problem by making the mounts approximately this cross section:



It's thin in the middle, but the motor is supported mainly on the thicker bits. I started with a piece of aluminium angle - the little cutout in the corner was to accomodate the pulley flange.

The pulleys I had at the time so went with them rather than buying new ones. If the belt does give problems and runs off I can always change them for castle ones later.

On my X axis I have a pulley with no flanges (the ones I made), and one with one flange. It's been fine so far so fingers crossed... You can always add your own flanges to the pulleys.

It looks like you've gone for the biggest motors you could find :lol:. What ratio are you using for the pulleys on the X-axis? Might be better off having a bigger pulley on the motor since there's plenty of torque. Then again if the critical speed of the screw limits the rapids anyway it wont make a difference.

I meant what size is the *steel* box section, as I'm going to make a frame soon for my router and wanted to get some ideas...