[time-nuts] Machining some aluminum help!

[Chris Albertson]

That is one reason people have been recommending heilicoils.   The
drill an tap size is about 30% larger than for #4 screws without the
inserts.  It is easier to do and when you are done there are stainless
female threads that are much stronger.

On Thu, May 25, 2017 at 3:57 PM, ed breya <eb at telight.com> wrote:
> ..., you can save a lot of grief by using a slightly larger bit than the
> standard tap drill. You're not really too concerned with optimal fit and
> strength here - it's more about being able to make a whole lot of usable
> screw holes without losing too many bits and taps,
-- 

Chris Albertson
Redondo Beach, California