Re: LPKF 2d drill

--- In CAD_CAM_EDM_DRO@y..., "Zoran A. Scepanovic" <zasto@m...> wrote:

> Hi Alan,
>
> I just received from a friend a scanned copy of a fax with schematic

for one stepper channel. From that poor copy I've figured out that
tyhe steppers really are 5 phase motors, and possibly are Oriental
Motors production. Scratched chip has a marking either PMM... or
HMM... or something simmilar and, logically, it generates the 5 phase
signals for motor. I'll try to contact LPKF to obtain more info on the
drivers. The machine is 101HI-P, and it is only PCB drill (no Z axis
stepper, only Electromagnet with damper).

>
> The controller has the RS232 connection with the computer, and there

is no software accompanying the drill.

>
> If nothing else helps, I'll try to change the motors with ordinary

steppers and to put my own L297/L298 controllers and to hook the
machine on an ordinary parallel port>

> Zoran A. Scepanovic

howdy Zoran,

The motors are almost certainly Berger-Lahr. The LPKF
is a European-made machine, and those motors come out
of Europe...Germany I believe...or Austria.

B-L invented the 5-phase, not Vexta. And the original
patents have no doubt expired by now. That work was
done back in the 70's.

When changing the motors, you'll be unpleasantly surprised
to find that not only is the shaft size non-standard,
but so is the mounting-hole pattern! Ask me how I know...<g>

I own serial #12 of the 101...and it's obviously a
prototype, even though it was shipped as a production
machine. There are extra sets of mounting-holes for the
linear bearings under the table...and the boards in the
controller were cut on an LPKF. Pretty funny...

Oh yes, if I remember right, the 5-phase protocol is
being generated by the Z80. (i -think- that's what's
in there....it's been years...). I used to have a
set of manuals with schematics, but don't have any
idea which box in which shed they're in now...or if
they just got tossed out in our move a few years back.

When I got the machine, I attempted to use the junk
software that came with it; dongles and all; but
gave that up, threw it all in the trash, and put new motors
and an Ah-ha control on it. Been making nice proto-PCB's
with it ever since. Pretty decent quality mechanism.

I think I still even have the original control-box sitting
out in the blue shed....if the squirrels haven't eaten
it, that is...<g>.

good luck with it!

Richard