Choosing The Right Machine

[glmr]

Oh, no, I'm not going to sew holsters. But sometimes I need to sew 3-6 layers of 1-1.8mm leather. Now I'm sewing with vintage but angry hand-cranking sewing machine. And with some violence and lubricant it sews about 5mm of leather, so I supposed that Sailrite could do it better. But as I can see it would be better to think aboutan industrial machine. Just not sure if I can attach a crank to industrial machine.

[doosty2]

I am currently making a stitch down shoe with a Juki 1541 and it is struggling a bit. The material is 8oz boot sole and a 5oz shoe upper leather (both chrome and veg tan). Total thickness is about 3/16". 

I have a few questions about what the best solution may be. 

The machine does a good job once I get going. Can I change the pulleys out to get better low end torque? Is there a better or bigger motor I should go for instead of changing the gear ratio? Is there a better all around machine that is standard with the low end power that I need? 

Thanks

[brmax]

Yes i agree a smaller pulley will help the torque available punching through. 

Good day

Floyd

[Wizcrafts]

5 hours ago, doosty2 said:

I am currently making a stitch down shoe with a Juki 1541 and it is struggling a bit. The material is 8oz boot sole and a 5oz shoe upper leather (both chrome and veg tan). Total thickness is about 3/16". 

I have a few questions about what the best solution may be. 

The machine does a good job once I get going. Can I change the pulleys out to get better low end torque? Is there a better or bigger motor I should go for instead of changing the gear ratio? Is there a better all around machine that is standard with the low end power that I need? 

Thanks

What type and wattage motor do you have now? What is the diameter across the motor's pulley? Ditto for the machine pulley?

[doosty2]

current pulley is a 3" and the motor is a small (looks pretty cheap too) dial adjusted servo motor. The 3/4 HP consew brushless servo is only 125ish on amazon. Is that a good step? My friend mentioned an EFKA but they are a bit more. 

[Wizcrafts]

10 hours ago, doosty2 said:

current pulley is a 3" and the motor is a small (looks pretty cheap too) dial adjusted servo motor. The 3/4 HP consew brushless servo is only 125ish on amazon. Is that a good step? My friend mentioned an EFKA but they are a bit more. 

See if you can get a 45mm (1.75") or 50mm (2") pulley that will fit the shaft on your motor. This will give you a boost in torque and reduction in speed. You will need a slightly longer belt to reach the smaller pulley (~1" - 2" longer).