Re: [CAD_CAM_EDM_DRO] Re: Yaskawa servo nice motor?

bitnick78 wrote:

>I was thinking of using a 3:1 reduction with timing belts, which
>leads me to my next question (I asked it in a separate message
>before, but got no answers):
>
>This motor has a 14 mm motor axle. The lead screw has a 8 mm axle.
>
>The pulleys I have found all have a bore size too small at the motor
>end and too large at the lead screw end. Should I try to drill the
>bore at the motor end to fit the motor axle?
> SDP/SI (www.sdp-si.com) has timing pulley with 20 grooves, 6 mm
>bore size, 20.60 mm hub size. I guess this could be drilled to 14 mm
>bore size, but that would leave only 3 mm for the set screws.
> Also, the mating pulley at the lead screw side (50 grooves for a
>reduction of 2.5:1) has a bore size of 12 mm, 4 mm more than the lead
>screw! How does one solve this?
>
>I do not have easy access to a lathe.
>
>

That is unfortunate. You might be able to bore these pulleys
accurately, but
if you get wobble or eccentricity, it will cause a nasty cyclical error
in the
machine's motion. It could also cause the belts to walk off the pulleys, or
have places where the belt is loose each turn. Not good! I found the
original hole in some $18 pulleys to be quite off center when I rebored
them. I do have a lathe. If you can get the pulleys into a Jacob's
chuck or
other holder on the milling machine, you should be able to rig a boring
bar and make your mill do a lathe's work.

Jon