Hi guys ,

I need some sort of rotary fixture for my mill ... nothing fancy or heavy , I just want
to make hollow spirals in wood and some light cuts in aluminum .
So ... this is what I think ... 8,5N/m ( 1200oz/in ) stepper motor , 25mm wide timing belt ( HTD T5 ) ,
3/1 ratio pulleys , angular bearings ( 40mm I.D , 68mm O.D ) , 100mm lathe chucks , aluminum frame .

I made some drawings , modeled the fixture in Rhino , then some renderings in KeyShot ...

What I need is some inputs ... have I made any mistake in my design ? will it be strong enough ? Do you like
the design ? Are there any problems with it ?

P.S . I already made a 4"th axis using a 5/1 worm gear reduction , but the backlash was too big , I hope that
this aproach ( timing belt + timing pulleys + strong stepper ) will do the trick for me ...

Thanks .

pics .......









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