On 1/15/2014 12:50 PM, Bob La Londe wrote:
"mike" wrote in message




TANGENT ALERT:

If your intent is perfect concentricity, isn't a flat the last thing you
want to do?

Response to tangent:
A small flat, not the full wall length of the engagement. The flat is to
provide purchase for a set screw to prevent any "reasonable" chance of
twisting like the tiny set screw size flat on the side of an end mill.
There would be full circular engagement above and below the tiny little
flat.

It's all a matter of degree.
If your primary objective is concentricity, shouldn't any deviations
from circular be radially symmetrical both dimensionally and for
applied force/setscrews?

I suggest that setscrews work by deforming something elastic.

One man's tangent is another man's failure to consider the consequences.
Sometimes, the cure is worse than the disease.
It's all a matter of degree.