On Wed, 10 May 2006 08:11:22 -0600, James Waldby
wrote:

Eric R Snow wrote:

So, after looking at the SP 125 Plus welder wiring diagram and
corresponding with folks here I have come up with most of the parts
necessary to build my own timing option. Using a kit from Velleman
(PMK 111) will provide the timing. It has two adjustments: Pause and
Pulse. The kit comes with pots that allow for a .5 to 5 second Pulse
and a .5 to 60 second Pause. The Pause time pot is a 10 megohm and the
Pulse is a 50k ohm device. Since the Pause pot has so much more
resistance it is very hard to finely adjust. I will be replacing it
with a 50k pot. In fact, I am going to replace both pots because the
ones in the kit are trimmer pots and I want the adjustment knobs on
the front of the welder. [...]

For pulse, consider a 5K pot in series with a 50K pot, and for the
pause, a 10K pot in series with 100K. There's a vast number of possible
arrangements of pots and fixed resistors in series and parallel to get
different adjustment curves, but two pots in series is probably the best
way to get both fine and coarse linear adjustments.

1) What is the minimum Pulse time.
2) What is the maximum Pulse time.
3) What is the minimum Pause time.
4) What is the minimum Pause time.
5) What exactly is the Spot timer meant to be used for when the timer
is the one provided by Lincoln. [...]

I don't know these answers, and I agree with Don Foreman that
manual control is probably good enough. Imagine sitting
there impatiently waiting for the pause to time out. You might
add a foot pedal if your concern is having your hands full.

-jiw

My Dan-Mig welder has Stitch/fill. In the 5 or more years Ive been
using it..the only time I used it was to learn what it was. My big
Airco Squarewave 300 Tig has stitch.. Same thing..

Im not much of a welder and will use any technique/tool that
helps..and Stitch was a solution for a problem that hasnt come up
yet.

I can see some utility value for autobody work..but where I
live..vehicles simply dont rust out....so never had that need.

Gunner


"The importance of morality is that people behave themselves even if
nobody's watching. There are not enough cops and laws to replace
personal morality as a means to produce a civilized society. Indeed,
the police and criminal justice system are the last desperate line of
defense for a civilized society. Unfortunately, too many of us see
police, laws and the criminal justice system as society's first line
of defense." --Walter Williams