Re: [CAD_CAM_EDM_DRO] Tool up

Hello John,

>
> My own car? Why would I want my own car when I can just ask for a lift
> somewhere? Car's are way...... too expensive for people my age compared to
> what they actually do.

My first beetle was 1000 Mark around 300 Quid which was still too much.
My brother bought always for 100 DM and sold them after 3 month for 200
DM.
No idea who he managed that. But once when the police stopped him.
He never picked up that piece of junk. Towing cost was higher than the
value of the beetle. (In England Robins should be inexpensive to buy and
run)
I myself started with a 125 ccm motorcycle and I am still hooked with
motorcycles.
When other friends never had money I traveled all over Europe with my
bikes.

> ... How accurate are these machines typically when you find
> them?
>

My experience is that a used machine in good conditions will have
a backlash of some 0,2 to 0,3mm and no play in the quill or spindle.
(lend yourself an indicator with magnet base to check / run the spindle
and listen with a metal bar against the bearing locations for noise.
If everything sounds smooth OK, if you hear crushing sounds forget it.)
A backlash of 0,5 mm you still can adjust normally on standard machines.
(check for worn spots: if the backlash is equal on the whole travel
it is OK, if there is one single worn spot, generally the ways too
are worn on one single spot and you better look for another machine!!!)
The Beaver mill I adjusted had a very nice tightening system of two nuts
per screw which would actually enable you to save yourself in the
beginning
the ball screws for a couple of years. You could adjust it to some 0,02
to 0,05mm
backlash that are workable with CNC.

> Please don't think I've ruled out Sherline, Tiag and the others, I most
> definitely haven't.

Good point.

>
> Thanks,
> John He.
>
>

Best Luck
Sven Peter