Homebrew PCBs

On Mon, 15 Feb 2016 00:36:34 -0400, you wrote:

>I use resharpened carbide in my dremel 395 with 1/8" shanks for PCB 
>work.  They work fine....I go down to around 0.31 mm. I can go smaller 
>but bit breaking happens every 10 holes or so.

The Dremel has enough runout that the bit wobbles and, as you noticed,
breaks.

I use a Proxxon, and have drilled hundreds of holes with the same bit
(it goes dull eventually) and have not broken a bit due to wobble.

I did use a Dremel, and that was insufficient.

Harvey