Homebrew PCBs

If you take a block of Delrin twice the thickness of the leadscrew
and tap it with a quality tap you get a nut with no backlash. You must
keep the leadscrew clean and oiled. Backlash becomes laughable because
the machine uses a Dremel. If you shim the bearing of the Dremel
between the case and bearing you will have a .003 or better spindle.
There is some play in the bearing of the Dremel and some runout 
depending on how you tighten the collet. The Porter Cable trim Router
has .006 of runout as does the Foredom Number 30 handtool. When
looking to buy a machine you must know what you want it for. Alot of
people want a perfect machine but they have no use for it. One machine
can't do it all either.




--- In Homebrew_PCBs@yahoogroups.com, "derekhawkins" <eldata@...> wrote:
>
> >Opinions?
> 
> Not bad for $600.00. Not really a "handsome" machine but a good starter 
> setup IMO. The only obvious shortcomings I see would be the X-Y travel 
> and the Delrin nuts don't seem to have any form of wear compensation. 
> How long is zero backlash going to last? Also, the precision of the 
> acme screws is not known. Compare with the Kerk screws and nuts used in 
> the lower end K2 machines. But then you're talking more than twice the 
> price.
> 
> --- In Homebrew_PCBs@yahoogroups.com, "Richard" <rwskinner@> wrote:
> >
>