On Friday, 21 August 2020 19:34:42 UTC+1, wrote:
I have an old Singer sewing machine. It is a model 221, AKA a
Featherweight. I got the thing at a garage sale for 5 or 10 bucks and
everything was there but the foot pedal motor control.
So I bought a modern PWM style control instead of an old carbon
disc style one because it was supposed to be better. At least I think
the new one is PWM. It is very light and doesn't get hot after lots of
use.
I think it may be under performing though because the little
machine seems to run too slow. I did go through the machine, cleaning
and adjusting it. It was dirty inside, had old congealed lubricants
clogging and sticking stuff up. Things were also really out of
adjustment so it would not have been able to sew even if it was
turning freely.
The machine now turns quite freely. It is oiled with the proper oil
and the motor, which I also cleaned and lubricated, is lubricated with
the proper grease.
So after all that the machine still runs too slowly. At least in my
opinion. The motor just doesn't seem to have much oomph and I'm
wondering if maybe the foot pedal control is not delivering enough
current and/or voltage. Since the control is PWM output would an
analog meter like my Simpson 260 be a good tool to measure the current
and voltage?
Or maybe someone here knows already about these machines and the
foot controls and can tell me what to expect from a properly
operating control. And the best way to check it.
Thanks,
Eric

Simple: connect it up without the controller to see how fast it goes.
Didn't know zigzag adaptors existed for ancient machines
Some early electric machines are quite slow.


NT