"DoN. Nichols" wrote in message
...
On 2016-03-02, 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.

Pin vises which I have seen typically have knurled shafts, which
makes it more difficult to mount them truly on center.

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

What *I* would use is one of the smallest Albrecht drill chucks.
I've found the 0-1/8" ones to work well down to the smallest number
drills that I have (#80), both in a Cameron Precision sensitive drill
press, and in the tailstock of an Emco-Maier Compact-5/CNC lathe.

From a search for Albrecht chucks, I find this description;

================================================== ====================
The Albrecht 70020 C30-J0 Classic Keyless Drill Chuck has a 0.015" to 1/8"
================================================== ====================

This is the one with a J0 taper.

There is also a smaller one -- 15-J0 -- maximum capacity of
1/16"

Both are small enough to handle rather elevated RPMs.

Enjoy,
DoN.

They are pricey aren't they? Still not much more than a name brand integral
shank chuck.

Now to see if I can find a J0 sto .250 stright shank adaptor. LOL.

Actually I think for now I am going to stick with 1/8 shank carbide micro
drills, and back drill a clearance hole, then the vent hole.

I will want one of those chucks in my arsenal though. As soon as I find the
taper adaptor.