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

Hi,



If the Dremel's problem is mainly the collet, you might try the Dremel
Chuck. It's a steel (according to my magnet), three-jaw, keyless chuck.
Though spec'd down to only 1/32" (31 mil), it holds 28 mil bits tightly;
I don't have anything smaller to try. I haven't drilled a PC board with
it yet, but I've used it successfully for tiny holes in other projects.



Jim



From: Homebrew_PCBs@yahoogroups.com
[mailto:Homebrew_PCBs@yahoogroups.com] On Behalf Of Harvey White
Sent: Monday, February 01, 2010 4:00 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Drilling





=============== <snip> ===================>

>
>Can someone tell me more details of the problems alluded to with the
>Dremel? Can they be fixed with a little machining to tighten

tolerances?

>(I did that with their routing table.) Would just taking extra care be

a

>workaround? Or, is Dremel a totally lost cause for PCBs?
>

The drill stand wobbles from side to side, which could be fixed. I
never bothered because it did work. Takes a bit of practice, but it's
ok. The collet is pretty miserable, being made of aluminum and 4
flutes allows it to be off center. This introduces an unpredictable
wobble (runout) in the drill. At 20K RPM, you risk killing a carbide
drill (say in the finer than #70 range, perhaps), but the holes are
oversize.

================< snip >=====================

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