Jon Elson wrote:
Louis Ohland wrote:
Machine shakes, RPM is past 500.
the machine doesn't have a back gear, does it?
When you get up to larger diameters, you need to slow down.
500 RPM at 2.75" diameter is 360 SFPM. Not insanely high
for Aluminum, definitely a problem for steel.

It does have a low range. I need to re-mount the large boring head after
I unmount the rotary table and mount the workpiece to the table.