On Thu, 29 Jul 2010 12:36:50 -0500, Jon Elson wrote:
Ignoramus6705 wrote:
I ran my mill for 16 minutes at 3,000 RPM (I get email when my CNC jobs
complete). It was machining a mold prototype for a kids toy. We will
need to cast 18 of them that in wax, and the mold will be made from
Aluminum. But I digress.

After I finished running for 16 minutes, I measured a few temps:

*) Inside the shop - 86 degrees
*) On the variable speed transmission on top -- 105 degrees
....
*) On the low part of spindle (at the QC-30 collar) 115 degrees. I am
not sure if I fully believe this last measurement. The bottom of the
spindle feels warm to the touch, I can hold it indefinitely, but it is
not comfortable.

Would you consider this temp rise to be excessive?

Yes. This temp rise in only 16 minutes at 3000 RPM does sound
excessive. But, [snipalot]

The rise appears to be 29 degrees F (or 16K) at the collar; is
that the figure you consider excessive?

--
jiw