Re: [CAD_CAM_EDM_DRO] Re: LPKF 2d drill

It can float over the pcb using a pressure foot, which
rides on top of the board in the lpkf models. Any
variations in the height of the board results in the
spindle assembly being raised as well, compensating
for differences in height. The reason I need variable
control was so I could adjust how much force the
pressure foot exerted and slow down or speed up the
drilling cycle. The sequences I use are programmed
into a parallel word eeprom, which can be adjusted in
timing by word multiplication or timing frequency
multiplication. The floating head can, in fact, be
built for a sherline machine. I've had similar
questions. The head works best with a low mass spindle
assembly or a counter-balanced spindle assembly. I'll
have to look up the 5 phase sequences for you. They're
around here somewhere. Let me know if you have any
other questions. Thanks ;)


--- Alan Marconett KM6VV <KM6VV@...> wrote:

> Hi Karen,
>
> Yes, LPKF makes some interesting equipment! What
> I'm after, is the
> stepping sequence for a 5-phase motor. Can you
> supply a URL to this
> data, or would you be willing to describe sequence?
>
> I believe that LPKF Z axis can "float" over a PCB,
> is this true? I'd
> like to see if something like that is adaptable to
> the Sherline mill.
>
> I and I'm sure others would like to hear more about
> your conversion
> program!
>
> Your solenoid control is novel!
>
> Thanks,
>
> Alan KM6VV
>
>
>
> Karen wrote:
> >
> > You mention that you have the original control box
> for the LPKF.
> > Would you be willing to take pictures of it and/or
> sell it? I have an
> > LPKF ColorCAM. A big thing it is. Took two people
> to move it. I got
> > NO electronics. I've been buying the parts one at
> a time. The hardest
> > part was the spindle. I had to buy a controller
> for the spindle that
> > came with mine. Do you have the spindle control
> electronics? Would
> > you be willing to sell them? I am always looking
> for LPKF parts and
> > pieces as well as more information on the ColorCAM
> machine. Please
> > let me know. Thank you.
> >
> > Btw, I am currently working on a conversion
> program for LPKF machines
> > that is written in visual basic and can drive 2
> phase and 5 phase
> > steppers as well as several servo motor
> drivers/motion controllers. I
> > even found a way to use the solenoid Z axis as a
> linear motor using a
> > PWM circuit and the varying inductance of a
> varying amount of iron in
> > the solenoid (position of plunger) through the use
> of a seperate low
> > power carrier frequency. After all the drill bits
> I was breaking, I
> > decided there had to be a better way to program
> the solenoid with
> > accel/decel curves. It all works from a parallel
> port too. Four
> > output lines go to the X & Y steppers, two lines
> go to the limit
> > switches all wired in parallel as well as the
> spindle down limit
> > switch, and two lines tell the programmable
> solenoid to either mill
> > or drill. The servo version uses the serial port.
> Complicated to
> > build one, simple to build many. I have several
> more months of
> > debugging and research until completion, but at
> least I'm not bored ;)
> >
> >
> > > 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
> >
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