I need to do a lot of deep holes in UHMW material. Generally, these
holes are 5/16" dia (loose tolerance) by 6" deep...sometimes deeper.

Using standard style long drill bits works ok..but there is a lot of
pecking and the stringy chips tend to bind etc. I was wondering if
anyone out there had any ideas for speeding up this process? Also, UHMW
tends to dull bits fairly quickly. It's not terrible and 5/16" drills
are easy to re-sharpen..but it would be nice to reduce this a bit.
Carbide tips hold up ok, but it's hard to get the nice sharpness that
UHMW likes to see when using carbide material.


Thanks for any ideas


Koz