Hi

I have Tormach 1100 and it looses spindle speed. Here is the problem I have been running for about a hour and it will drop the spindle speed 200 rpm. the feed rate is 30 and the depth of cut .020 3/8 end mill spindle speed is 1200. I have not been running a hour strait 3or4 minutes between parts.

Thanks for the help
carlboe