Somtimes My Clutch Motor Runs Backwards And Sometimes Forwards. Why?

[LoveToLearn]

No,you don't want the belt to slip,adj it so it has 1" of play,a smaller motor pulley 2" will help too.

Ok will do Cowboy. Are bigger handwheel pulleys available also? Right now the pulleys look about equal in size. If I had a 2" motor pulley and 6" handwheel pulley thats 3:1 so my 1750 motor would be turning the machine at 583. I wonder how many stitches per minute that is.

Is this doable? I thought about a speed reducer by they are a bit pricey and it looks like you have to move the motor mounts or the sewing machine so it is offset so the reducer pulley lines up with the handwheel pulley. Not sure I want to remount the motor an inch over. I cant see how else that would work.

Thanks

LoveToLearn

[dikman]

It shouldn't be too hard to find a suitable pulley, just find a place that sells pulleys and ask for one with the diameter you want, with the correct profile for your v-belt and the correct shaft diameter (which I'd say is 1/2"). You'll need one with locking screws/bolts.

[CowboyBob]

I'm not saying this because I sell them BUT a servo is the best way to go.When you use a clutchmotor you have to learn to pump the pedal,meaning once the machine starts sewing you need to leave up or else it'll take off,a servo runs a lot like a home machine when you press on the pedal & starts off slower & doesn't get away from you.

[LoveToLearn]

I took the cover off the back of the motor and removed the capacitor. I put a voltmeter across the terminals with the meter set at 600v ac and got no reading. Then I started the motor with no capacitor and it ran the same as it did before. So the capacitor was doing nothing. I think I need a new cap to tell the motor which way to start. I dont even know if the cap that was in there is the proper cap. I wish I could get some part numbers for the cap and the wearable clutch parts. I would have a good motor then. Then I need a small motor pulley which is 15mm bore and about 35 to 45 mm diameter 3V and a speed reducter which I will make. I have been wondering why guys with the servo motors also add speed reducers? I thought the servo motor provided totall speed control.

LoveToLearn

[Art]

It does, but the speed reducer multiplies torque by 3.

Art

[LoveToLearn]

No,you don't want the belt to slip,adj it so it has 1" of play,a smaller motor pulley 2" will help too.

Ok. Is that 1" of play at the foot pedal or 1" between the clutch disc and the pressure plate?

Thanks

LoveToLearn

[Wizcrafts]

Ok. Is that 1" of play at the foot pedal or 1" between the clutch disc and the pressure plate?

Thanks

LoveToLearn

Belt play is usually measured half way between two end points. This means about half the distance from the motor pulley to the machine pulley. In practice, I usually set the play at table level, at the belt slot, behind the bobbin winder wheel. If you don't have a bobbin winder on the table, just figure where the 50% point is and push inwards on the belt. If it deflects between 1/2 and 1 inch, it has enough slack. If the belt slips, tighten it until it stops slipping.

[TinkerTailor]

I have been wondering why guys with the servo motors also add speed reducers? I thought the servo motor provided totall speed control.

LoveToLearn

When i got my 5100, it was set up on the middle pulley of the 3 step speed reducer. I had to slow the motor down all the way to get even close to stitch by stitch sewing. I found that when the motor was this slow, it lost modulation and was more like a 3 speed. After i switched to the smallest pulley, i turned up the motor quite a bit, now my slow speed is slower than was possible on the other pulley, however my top speed is faster and it is a way smoother transition from slow to fast.

In other words, my motor can go slow, but it likes it a little faster. The speed reducer allows this. Plus the torque as Art said.

Edited February 25, 2016 by TinkerTailor

[dikman]

When i got my 5100, it was set up on the middle pulley of the 3 step speed reducer. I had to slow the motor down all the way to get even close to stitch by stitch sewing. I found that when the motor was this slow, it lost modulation and was more like a 3 speed. After i switched to the smallest pulley, i turned up the motor quite a bit, now my slow speed is slower than was possible on the other pulley, however my top speed is faster and it is a way smoother transition from slow to fast.

In other words, my motor can go slow, but it likes it a little faster. The speed reducer allows this. Plus the torque as Art said.

I've noticed the same thing with my servos, if I can increase the minimum speed setting of the motor while keeping the overall speed of the machine low then it runs smoother.

[LoveToLearn]

so servos need rpm to make power too then. When I read about servos they say in the ads that they make the same torque at every rpm but I always suspected that cant be true.