Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

----- Original Message -----
From: "javaguy11111" <javaguy11111@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Tuesday, December 30, 2003 1:16 AM
Subject: [Homebrew_PCBs] Breaking drill bits


> I just got a set of resharpened carbide bits in from drill city. I
> chuck one up into my dremel press. I snap the bit on the first hole.
> Thinking maybe I moved the board, I tried a second bit and snapped it
> as well. This was with a #81 bit. So I thought maybe I am just a
> little clumsy and try a 1/32 bit and snap it. Noticeing that the bit
> did not penetrate all the way, I thought maybe I needed a backer.
> Still no success and I snap another 1/32 bit.
>
> My guess is that the dremel just has too much slop for these bits. Any
> suggestions.

I use a Minicraft drill and stand with reground 0.7 mm and 0.8 mm carbide
bits: it's similar to the Dremel with quite a bit of slop in the bearings. I
don't break many bits though. The Proxxon drills are supposed to be a lot
better and a local tool shop stocks them, so I might try one.

Leon
--
Leon Heller, G1HSM
Email: aqzf13@...
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html