I see people buying these and other commercial machines, Then after having them, don't like the speed they run at.. To often thats because of there clutch, unlike the clutch in a car these have to slip to control the speed. Most these machines have been sitting unused for many years, so there clutch will grab and run at the speed the motor goes.
Mr Rays did a write up on installing a speed reducer, that he already had. otherwise to buy those it's $150 , but for that price to your door you could have a new servo motor, those come with new light, switch cords bolts everything needed .
being poor , I tired changing pulleys. I'm unlucky and my motor a singer motor ( on this one) you can not change out the lower pulley
you have to go to a smaller pulley at the motor to slow the speed, doing this will work, but it loose it's torque / punching power. I did this on one with an arrow motor that has changable pulleys out come was.. couldn't sew a wet paper bag on a 100 degree day.
SO, you can remove the hand wheel and replace that with a common larger pulley, which look like dog doo. out to the shop I went and made this, which cut the top speed in half and must have double the torgue
even on leatherwork (wed site) I have never seen anyone talk about making this type of upper pulley. It just slips over the factory hand wheel , I went cheap by using bolts and tabs to secure it to the handwheel
this started life as a 1/2" thick 5"x5" square piece turned down to 4 1/2" factory pulley is 2 1/2"
I'm sure counting the alu piece and machine shop would want over $75 to make one but if you have lathe, This Idea just might give you something to do someday.
