"Paul Drahn" wrote in message
...
On 3/3/2016 8:59 AM, wrote:
On Wednesday, March 2, 2016 at 1:00:12 PM UTC-5, Bob La Londe
wrote:
Are there any pin vises suitable for CNC drilling at high speeds
for micro
drills. A high quality high precision pin vise.

I know. I know. Sounds like an oxy moron. I think if I can find
a pin
vise that will actually hold the bits straight, and has low enough
runout,
it will be possible with correct speed and feed calculations.

I bought two mid price pin vises from two different sounces, and
unfortunately neither holds a drill bit particularly straight.

In the mean time I ordered some carbide micro drills in the sizes
I need,
but because of their DOC capabilities, I'll need to back drill the
part.
Oh, joy. A secondary setup for a part what fun. LOL.

FYI: Did some tests with what I had and found HSM Adviser wanted
to feed
way to fast. As a check I plugged the same numbers into ME
Consultant, and
it indicated less than half the feed rate of HSM. The HSM numbers
flexed
and broken drill bits very quickly. Haven't retried yet with the
ME
numbers.

I've got a No. 0 Jacobs chuck that I use for small drills. Is that
still
too big?

George H.

I have a Doall drill that uses a No. 0 Jacobs chuck. Runs 0-20,000
or 0-30,000 RPM. No noticeable runout and doesn't break bits. Have
not used it on really small bits, but the chuck does completely
close, so bits size 80 or so should work.

Paul

I did look up the Jacobs 0 chuck but couldn't confirm it would work
under your conditions, and it's expensive. The minimum drill shank
size is 0.0135".
http://www.jacobschuck.com/keyed-chucks
--jsw