RE: [CAD_CAM_EDM_DRO] Re: Newcomer

Hi

My first 'proposed' cnc will use some BiPolar PM55L048 steppers I
salvaged from some HP Deskjet printer, these are 12v 800mA, they step at 7.5
degrees, my first attempt is only to be a small cnc for drilling pcbs, The
stepper driver circuit I am quite OK with I have already built a serial
controlled PIC based driver using a ULN2803 driver, this uses half step to
give me 3.75 degrees per step.
I am just not sure what the output is from the parallel port, on my
serial version I have a VB prog that sends direction, no of steps and the
delay between steps, I suppose I could change this to read a GCode file, but
I really wanted to use KCam to drive the machine.


Any advice much appreciated.

Brad

-----Original Message-----
From: basic_cnc [mailto:abasir@...]
Sent: 11 June 2003 06:09 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Newcomer


Are the steppers unipolar or bipolar? What are the steppers ratings
(Voltage, Amperage) as the driver need to be sized for it.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Brad Woolley <brad@r...> wrote:
> Hi,
>
> I'm new to the list, and am currently planning constructing a CNC
> machine, I've taken various areas in turn to check what I can manage
before
> committing money to expensive hardware, things are expensive here in
South
> Africa !. I've managed a PIC based stepper controller, having already
> 'mastered' Eagle for PCB production I have tackled converting an Eagle
> layout into KCam for drilling and milling, but I am now a little stuck.
>
> Can anyone point me in the right direction or offer any information
> on a parallel port interface between KCam and the actual stepper
motors, I
> would prefer something I could make myself being pretty OK with
electronics,
> PIC and computer interfaces etc.
>
>
> Any suggestions would be gratefully appreciated.
>
> Cheers !
>
> Brad



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