Electrical Testing of Domestic Sewing Machine Motors

[@rich-f-in-tx6388]

I was wondering about you today and here you are. Good to see ya!

[@BobFowlerWorkshop]

Howdy Rich! Two videos today...

[@rich-f-in-tx6388]

@@BobFowlerWorkshop I'll check the other out. Y'all have a great night. 🖖🇺🇸

[@dalesuhre6522]

Thanks for the video. I've been trying to figure out how to test my two potted motor sewing machines that I have and now I know how to do it.

[@BobFowlerWorkshop]

Happy to be of assistance!

[@henrilebovic5229]

Where did you learn how to do this stuff?! You are by far the most detailed and skilled sewing restorer who shares many helpful tips that I can't find elsewhere.

[@BobFowlerWorkshop]

Wow, thank you!

[@mikeypotts4732]

Thank you!

[@BobFowlerWorkshop]

You're welcome!

[@jorgesaenz455]

Good job.... love it !

[@BobFowlerWorkshop]

Thanks Jorge!

[@AnonymousAmyMakes]

When I do my bar to bar testing, the range is between 8.6 and 9.4 until I get to one bar and it jumps to 124.3. Ideas???

[@tonywebber4361]

Hi, brilliant vid, thank you. I have a question if you have time - testing a PAB motor from a 431G - done the stator tests (OK) but testing my rotor coils I see my commutator only has 11 comm bars (and 11 stack faces) so wondering how to test opposite bars? Thanks in advance

[@jomercer21113]

So what do you do if one of these numbers is out in left field?

[@BobFowlerWorkshop]

It's purely a diagnostic tool. Unfortunately, at this point, "new" parts for our vintage motors are impossible to find, but often "junk" motors can yield usable components to save another piece of equipment. If you have a pretty consistent reading and then one winding is open (no continuity), that could be a good explanation why a motor was running poorly. I worked on a potted motor for a customer and discovered a problem with one of the windings in the stator (as you said, way out in left field) and a dead short between two adjacent windings in the rotor. I had parts from another motor and was able to get it back in service.

[@debbiepring2236]

Super!

[@BobFowlerWorkshop]

Thank you very much!