Have used a cheap Chinese air cooled 18krpm 3kw spindle for years. You
must drive them off a VFD anyways.
At 3000 rpm you have much less power. Well the torque is probably the
same but power=torque * rpm.
The air cooled is cooled by a shaft-driven impeller, so fan rpm drops to
3000 rpm too. At high torque, low-rpm loads, it will still generate a
lot of heat but get very little fan cooling. You can swap with a DC
computer fan or go with water cooled.
Danny
On 6/23/2019 5:41 PM, Andy Evans wrote:
Greetings everyone,
I wish to upgrade a dressing spindle in our EMC grinder. We currently
have a very small DC motor turning a one-inch diamond-studded disc at
about 1500 RPM, with fairly decent results, but my research indicates
we may be better served with a much larger disc and higher RPM. We
drive this dresser under the wheel with a contoured path to give us
the form we desire.
There are available dresser spindles in the neighborhood of $12K that
are very good looking but we wonder if we can build something that is
sufficient for our needs for far less.
We are considering the common router/milling machine spindles on ebay,
air or water cooled, in the 1-2 KW range. Most of these seem to be
equipped with either an ER11 or ER20 spindle, and most are advertised
as 18,000 or 24,000 RPM. Some of them tout multiple bearings. Some
claim a range of 8,000 to 24,000 RPM.
Since I would expect many on this list to have experience with these,
I am seeking to find out if we can successfully utilize a 3,000 to
10,000 RPM range, and also if the ER mounts are integral or if they
can be removed.
Or, if there are better ideas for accomplishing this, or if we are
crazy not to purchase the $12K solution.
Thank you!
Andy Evans
Evans Precision Tooling Incorporated
541.990.2122
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