Re: [CAD_CAM_EDM_DRO] LPKF 2d drill

Hi Zoran,

Too bad you don't have something to drive the machine so you can watch
the signals into the "scratched chip". Well, you've got the L298's on
the board already, perhaps you could work out a 5-phase drive to the
L298's, possibly using a PIC, or a counter. The data sheets on the
motors should describe a 5-phase drive, and that can be implemented with
counters or PIC. Hopefully LPKF can provide you with info. The Z
shouldn't be a problem for PCB's and engraving (?). Ordinary steppers
are, as you mention, are a possibility.

Alan KM6VV


"Zoran A. Scepanovic" 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.
>
> Best regards,
>
> Zoran A. Scepanovic
> ZASto@...
> http://zasto.bizhosting.com
> -------Original Message-------
>
> From: Alan Marconett KM6VV
> Date: Saturday, May 19, 2001 03:27:27
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] LPKF 2d drill
>
> Hi Zoran,
>
> I wonder if you have something like 5-phase motors? The L298's normally
> handle two windings each. Three would give you 5 phases, plus a spare.
> The KPKF is a good PCB mill, from what I've heard. Did you get PC
> software for it? Sounds like the "scratched up" chip develops the 5
> phases from (hopefully) a step and a direction line. Might be
> different! Might just be a buffer. Does it connect to the PC with a
> parallel port? They might also be driving each phase themselves, much
> like what we call 4-phase drive! Very interesting stuff! A schematic
> would be great, but I'll bet you could figure it out! I've long wanted
> such a machine. I'd like to here more from you! Vectra makes 5-phase
> motors.
>
> Alan KM6VV