[KPNO]

Hello All,
Here is probably a newbie request for validation as to what I think is
causing intermittent vibration on the feed axis of a home-brewed tool.

I am using a 1/3 HP 90VDC motor to power a lead screw
through a two pulley/belt system for a feedrate of 900 mm/min (~32 inch/min).

The pulley on the feed lead screw does ok for about 5 minutes and
then after heating up (my theory) it starts to vibrate and go into
oscillation.
Unfortunately without end of travel switches, I had run the stage into the
end of travel a couple of times (yeah, ouch) and when this happened the lead screw just kept rotating and caused the set screws
holding the pulley to score the shaft (connected to the lead screw).

I removed the pulley and used a fine metal file to smooth the ridges in
the shaft and replaced everything. Things run, but again after about
5 mins the oscillation/vibration returns. I ordered a new pulley today
from SDP-SI.com/eStore and will replace the old pulley. But I am
wondering if I analyzed this correctly?

Anything else that could cause this? The pulley on the motor shaft does
not oscillate/vibrate at all.

Can I still use the lead screw shaft for the new pulley?

Your thoughts greatly appreciated.
-KPNO

[KPNO]

Just to finish this off for those who have viewed the question.
It was the set screws...once I smoothed the rod with a fine metal
file and put new set screws in the pulley the thing ran great.