On 8/21/2013 11:45 AM, Tom Gardner wrote:
How does one determine clearance for drill bushings?

Depends on the application.

If the device is a single drill, then the bushings can be tighter
tolerances.

If the device is 36" long, has an expected growth pattern of a few
thousandths+ due to thermal expansion during use, then it's a whole new
ball game.

....then you have to worry about whether the head is aluminum or steel,
whether the bushing plate is the same material or different, whether you
can sufficiently cool the device to control growth or manage it in
another manner, etc.



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