Re: Yaskawa servo nice motor?

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.

Any comments?

Arvid


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dan Mauch" <dmauch@s...>
wrote:

> Hmmm .64 Nm is only about 90 oz in continuous torque. That's not

much

> for some Bridgeport type machines unless you used a 4 or 5 to 1
> reduction using timing belts. It also requires a brushless servo amp
> which are generally pricey.
> Dan
>
> -----Original Message-----
> From: Jon Elson [mailto:elson@p...]
> Sent: Thursday, November 06, 2003 7:58 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Yaskawa servo nice motor?
>
>
>
>
> bitnick78 wrote:
>
> >Hi group!
> >
> >Would this be a good motor for a bridge type milling machine

intended

> >for wood and light aluminium work? To be coupled to a lead screw

with

> >lead of 5 mm/turn.
> >
> >* 3-ph 200 watt PM
> >* cont/peak torque: 0.64/1.91 Nm
> >* winding resistance: 3 Ohm
> >* cont/peak current: 2.0/6.0 A
> >* torque constant: 0.355 Nm/A
> >* rated voltage: 200 V (don't know why this is specified, isn't
> >current the important thing?)
> >* voltage constant: about 80 V peak-to-peak / 1000 RPM (I measured
> >this by spinning the motor at about 1000 RPM and watching the

voltage

> >on an oscilloscope)
> >* encoder: 2000 counts/rev
> >
> >