Homebrew PCBs

--- In Homebrew_PCBs@y..., Adam Seychell <adam_seychell@y...> wrote:
<snip>  The Dremel I once had was so out of round 
> you could see the drill tip blur when it was running. Everything is 
made 
> to a price.
> 
> Adam

Adam, I checked the runout on my Dremel a while back, and my first
reaction was, 'Dang, I have a bent drill!' Turns out of course,
the drill was OK but the collet is a piece of crap. I don't 
remember the actual values, but everything except the collet was
very near dead-on (by my standards). I have a bunch of Dremel odds
and ends and none of the collets ran anywhere close to true. 
The drill would be centered at the collet exit, but would, as
you described, rotate in a circle at the tip. I intended to make
a new collet, but never found the time. But by keeping the tool
extended length to a minimum, I can live with the best collet of
the lot.
Anybody else checked this? Do I just have a bad (abused?) bunch
of collets? An old one with a black oxide finish was better then
the newer 'white' ones.
Al