Hi John,
Yeah, I remember when it was ∗Artwork∗ ! I'll try the .0125 grid. I
take it you don't necessarily want anyone building the tit-for-tat? I
suppose you posted it just for an example of your technique. I'll just
think up a little board I need to use as a test case. I DO need a
3-axis buffer/driver for some HP stepper drivers and motors. That would
entail a DB 25, 3 74LS06's, a few resistors, cap's and a terminal strip.
$40 for a 3-axis board w/plans? That sounds like Dan's board. Are you
selling yours for a similar price? Perhaps you need to design a
L297/L298 chopper driver board! If your unipolar's aren't chopped, they
can't produce as much power, and are less attractive to buyers. I've
got some cute little boards from the 70's, but as simple unipolar boards
driving old 8V SloSyn steppers, they don't have much performance!
Alan KM6VV
crankorgan wrote:
>
> Hi Alan,
> The Tit4Tat can run relays, stepping motors etc. It has
> lots of outputs and several inputs. These type boards are used by
> budding programers. Rather than just do a simple PCB layout I went
> for making ARTWORK. In the old days the PCB traces were called
> ARTWORK. When ICs came out the boards got ugly!
> If you pull my DXF up in a Cad program using a .0125 Grid you
> will see how I draw the traces and pads. I use a Mechanical Etching
> bit from Think and Tinker. I put a picture of it in the KLEINBAUER
> folder. I got the Piker 4x4 working but I am bogging down on the
> rework. I am taking out extra cuts. Selling boards has become a real
> mistake! There are so many people doing it. Like a fool I listened to
> someone. Now I see there is a nice 3 axis controller board for only
> $40 (Bare) L297/L289. My strength is in designing cheap CNC machines.
> I was told to listen to my customers, bad idea.
>
> John
>
>