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I made a 1:3 speed reducer for my Singer Spartan. It really helps with needle control and low speeds, and gives a nice boost in torque.
The machine needed some place to mount the speed reduction add-on parts, and getting a 12x17 1" thick acacia cutting board from Amazon and jigsawing out negative space for the machine to rest in turned out to be the easiest and cheapest way to handle that.
The speed reducer is this 1:3 belt-driven pulley system from Aliexpress and this extra pulley, and this polyurethane pulley belt material (5mm dia). I would have repurposed the motor shaft pulley that came with the machine, but it's for a 6.35 shaft diameter (aka 1/4") and the aliexpress pulley system uses an 8mm shaft with no option otherwise (though you can choose the shaft diameter for the small pulley that comes with it, and you should choose 6.35mm if you want it to fit on a 1/4" motor shaft).
I then bolted the speed reducer to my cutting board base at a distance and alignment that got the toothed belt lined up right, and then I cut and welded the PU belt drive to an appropriate length. For some reason on this machine the motor midline is skewed away from the machine's midline, so it looks like a did a sloppy job with the speed reducer alignment, but thta's where it had to go to get the toothed belt running straight!
All in this was about $40 or so IIRC, and that's way cheaper than the industrial speed reducer pulley systems I've seen, and a big boost in the machine's usability!
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