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.