"Dan Caster" wrote in message
...
It isn't the design process that I am thinking about. Say you have a
blueprint that calls for a 1 inch deep hole .138 diameter +/- .003 (
just so you don't worry too much about the diameter ) but true to the
axis within .004. Can you reasonably expect to drill it with a twist
drill? Since that requires that the angle be within about .25 degree,
my guess it might be possible with a rigid machine. But has anyone
here know if one could do it with one operation or is it something
that requires two operations and a lot more cost?

I agree that measuring is part of the problem.

Dan

Yes, it is within reason to drill such a hole with a twist drill. What
you might discover is the odd hole would not be within the acceptable
limits, but in general it is possible to achieve.

Harold