Homebrew PCBs

Hi Alan,
        I sell 4 axis unipolar controllers. They are heavy duty. I 
kept getting asked to make a Bipolar board. So I added a L298 to my
design. A simple cheap board for experimentors. What it comes down to
is they save $10 buying my board while I loose hundreds designing and 
debugging it. What I find is people are unable to find anything on 
the internet. Maybe they use the wrong search engine. I was told when 
people ask for something, make it avalible. I should have bought a 
batch of Dan's boards and resold them! Now that a Business! 
      There are several people besides myself who sell unipolar 
driver boards. A first mill only needs 12" per minute. A Dremel can 
only handle 8" per minute with a 1/8" bit. Going 20" per minute with
a bed that is only 6" X 6" is insane for a beginner. Cheap unipolar 
drivers can run cheap motors at 20" per minute. I myself only work at
6" per minute. But because my GCodes are very efficent, effectively I
am milling faster.
       Mill a Tit 4 Tat and I will send you the instruction booklet
via Email. There is a photo of the board under How to Mill Circuit
boards.

                                    John




--- In Homebrew_PCBs@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:
> 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
> > 
> >