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
> >
> >