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Have you tried your Singer (s) on heavier materials under motor power?
I'm getting some satisfying results from a 99K manual with 100/16 denim and leather needles - easy to judge by feel how many layers of vinyl / cordura / reclaimed leather it can cope with, and slow enough to avoid most mistakes.
I could probably fit a motor to mine , but at this point I'm really looking for opinions regarding the 'worth' of such a conversion...
MrE-
Funnily enough I tested on this offcut, it was no trouble.
When it was manual & I made bags the thicker seams where multilayers came together due to my poor design were hard to punch through, I guess there's a point where the motor will struggle the same.
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To add, not sure how much a motor unit would cost, but if cheap I think it'd be worth a go.
rhb
Finally looking at the electric singer I got in a charity shop ages ago. It is a 1930 66k.
Motor turns fine but belt slips, tried re-tension any tighter it binds. Guessing new belt is the answer so ordered one from a singer spares place, plus some singer machine oil too.
Was hoping this helps restore sewing mojo for some myog play, but...
The bobbin cover plate is missing and the spring clip for it likewise with a sheared screw in place.
Realised I could swap the motor to the other singer a 99k from 1951 then we have a familiar machine motored up with the 66k converted to a manual machine and if I can remove the sheared screw and find those parts it will mean have 2 functioning machines.
n+1 always a good result.