speed reducer

[torrbuidhe]

On Saturday November 12, 2016 at 6:29 PM, Wizcrafts said:

Sticks;

Have you read about the Family Sew servo motors? I have to believe that somebody in the UK sells this brand. This motor starts spinning at 1 rpm if you so desire. It doesn't have a lot of torque at the slowest speeds, which is why many users add a speed reducer. I have this motor powering a big Cowboy CB4500, through a 3:1 speed reducer. I can sew 1 stitch every 8 or 9 seconds if I had reason to do so. Once in motion it penetrates the thickest stack of leather (unless the belts slip).

The same motor without a speed reducer powers my long arm walking foot machine. I can hold it at a steady pace of about 1 to 1.5 stitches per second at the low end, with the speed limiter all the way down to 350.

This looks like the Family Sew motor here - http://www.anglosewing.co.uk/anglospeed.html

No price though

 

Neil
 

[dikman]

The smallest pulleys I've seen are 45 mm (that's what I use). I'd fit the smallest pulley I could to the motor, regardless of whether or not a reducer is fitted.

[dikman]

Yeah, most sewing machine pulleys tend to be 15mm. I had to sleeve one for a reducer I made so it shouldn't be too much of a problem. I drilled and tapped the pulley to take a couple of set screws 'cos I couldn't use the keyway to lock it in place.

Edited November 16, 2016 by dikman

[Constabulary]

I just have checked the last Jack Servo I bought from CS it has a 15mm shaft but that is the 750W w/o NPS, the other with NPS I bought has a 12mm shaft as well - don´t know why that is. Just wanted to have it mentioned.

[gigi]

Finally we managed to have a potentiometer pedal, using scrap material around the home. It is not the best but it serves the purpose. There is plenty of room for improvement. . The control of the machine is much better now. Locked the clutch on engaged position and now the motor is permanently connected to the machine. (The VFD is stopping the motor; after that motor is turning freely). 

Second video shows the setup is working also with veg-tan leather 7 mm with 138 thread (20 metric).  (It's just a test: the machine is not a heavy duty subclass.)

 

 

[brmax]

Excellent!

? curious what is the signal voltage 5? to the treadle switch

Seems it has to be different and reduced for the electronics

 

Floyd

[gigi]

Thanks! Pedal provides variable voltage 0-10V, 10mA max to the VFD.

[TinkerTailor]

That is a winner.

[Constabulary]

Mad electric scientists!

[dikman]

Well done! Now that you've proven the concept works you can make a better pedal.(Maybe ).