Homebrew PCBs

Stefan Trethan wrote:
> 
> all collets i have ever seen here are brass ones. i guess made on a lathe.
> but there are also small adjustable drill jucks available.
> they are good precision, no scrap, but i fear not good enough for carbide bits.
> what do you think about that?
> 


I originally bought a Dremel, but it was so out of round, that 
the tip of the drill looked blurry when it was running. Well that 
just confirms you get what you pay for. The Dremal used cheap 
aluminium collets, because that's all what's needed for the 
indented purpose. The industrial die grinders, such as BOSCH 
GSS27 have hardened steel ground collets. The collets are 
constructed so they always seat precisely in position when 
tightened up. Another compact straight die grinder is the Matabo 
G500, but not sure of prices. The GSS27 cost me Australian $240 I 
think. So probably around $120 USD. It was my uncle who 
recommended the BOSCH grinder as a PCB drill, he has owned one of 
these for 20 years. So it should last me for ever and a day. Of 
course I can take it out of the drill press and use it as a die 
grinder if I every need too.

Funny thing was that one day I visited this PCB manufacture who 
specialized in prototypes and small runs. At the corner of the 
shop I saw one of these GSS27 laying on the bench, and so I 
started talking to the owner about it. It turns out they use the 
exact same drill motor in their manual drilling machines as I had 
used.