22 Sep
2006
22 Sep
'06
9:11 a.m.
On 9/22/2006 at 7:24 AM dwight elvey wrote:
Although not recommended, years ago we got some 8 inch
drive at surplus
that were 50Hz. The drives were cheap and we didn't want to invest a
lot. We simply ground down the motor pulley with a file. We checked our
progress with a strobe disk on the flywheel. It did require elongating the
mounting holes for the motor.
When I wanted to use a 50Hz 8" drive on 60Hz, I worked out the size of the
new pulley, went to Halted and dug around their parts bins. I came up with
something of the right diameter and shaft size, but made for a toothed
timing belt. Not "crowned", but it had flanges to keep the belt in place.
I used it for almost a decade, running the spindle motor from 240v 60Hz,
courtesy of a linear P/S with 2 primary windings hooked in series as an
autotransformer. I didn't have a lathe back then; if I had to do the same
thing today, it'd be a simple matter to turn a new one.
Cheers,
Chuck