Members CustomDoug Posted March 1, 2013 Members Report Posted March 1, 2013 I'm having an intermitting problem with a clutch motor... it's on a skiving machine [that I'm in the process of trying to figure out how to use] - sometime (usually lately) it will completely bog down under the slightest amount of load. Like when I try to feed leather through the machine. Once it does this, it will only start up again if I let off the foot pedal completely and let the motor catch up again. It's a 400W motor that I have running in the opposite direction as a regular sewing machine via a switch on it's case, as required for the skiving machine. I can actually slow the motor down enough for it to stop by the "hand wheel" while holding the foot pedal down completely. Is there some kind of adjustment I can make to help with this problem.. or is it just a bad motor? BTW, it will run fine, building up speed to it's max if there is no load added to the equation. Thanks for any help! Quote Does Anyone Know Where the Love of God Goes When the Waves Turn Minutes to Hours?
Moderator Wizcrafts Posted March 1, 2013 Moderator Report Posted March 1, 2013 400 watts is not even 1/2 horsepower. You should be using at least 1/2 hp, if not 3/4 hp, at 1750 RPM. For the time being, try changing to a smaller motor pulley and matching v-belt (1 inch smaller belt per inch smaller pulley). Also, oil every oil cap and hole and clean out any skived pieces from the knife area. Quote Posted IMHO, by Wiz My current crop of sewing machines: Cowboy CB4500, Singer 107w3, Singer 139w109, Singer 168G101, Singer 29k71, Singer 31-15, Singer 111w103, Singer 211G156, Adler 30-7 on power stand, Techsew 2700, Fortuna power skiver and a Pfaff 4 thread 2 needle serger.
Members CustomDoug Posted March 1, 2013 Author Members Report Posted March 1, 2013 400 watts is not even 1/2 horsepower. You should be using at least 1/2 hp, if not 3/4 hp, at 1750 RPM. The tag on the clutch motor says 400Watts, 1/2HP, 3450RPM. Also, a manual for the same type of skiving machine (typical fortuna features) suggests 200-400 watt motor with a range of 1000-1200 rpm (though that speed seems low to me) http://sunstar-swf.eu/pdf/km-76.pdf . Could it be the tightness of the belt or maybe the screw that controls the brake (I haven't touched it)? I have oiled everything a few times now though. Quote Does Anyone Know Where the Love of God Goes When the Waves Turn Minutes to Hours?
Members Les No6 Posted March 1, 2013 Members Report Posted March 1, 2013 1/2 HP is more than enough but I certainly would run any machine at three times its rated speed, turn the skiver by hand with the motor turned of and your foot on the pedal to see if every thing turns freely if it is free there is something wrong with the motor, you would be better of changing to a 4 pole motor any way. Single phase motors have no start up torque and depending on type have separate start up windings these have very little torque and just spin the motor up to speed at which point the main windings kick in, so if the motor spins up to speed and has no torque the starter is working and the main are not, also make shure it's not a three phase motor with a capacitor wired to one of the inputs a trick used by some disreputable dealers the motor will spin up on single phase but have no torque. Quote
Contributing Member Ferg Posted March 2, 2013 Contributing Member Report Posted March 2, 2013 My skiving machine came with a clutch motor of similar size. Ran the machine with absolutely no problems. I changed to a digital Servo and I love it. ferg Quote
Members tnawrot2 Posted March 2, 2013 Members Report Posted March 2, 2013 Clutch Motor Bogging Down On Skiving Machine ? Can you see or hear the motor loosing RPM, or is the belt slipping on the pulleys? Quote
Moderator Wizcrafts Posted March 2, 2013 Moderator Report Posted March 2, 2013 A 3450 RPM motor produces most of its power at very high speeds only. You would be better off with a 1725 RPM 1/2 HP, 550 watt motor. That's what was in my USM Puma skiver, which I sold years ago. Quote Posted IMHO, by Wiz My current crop of sewing machines: Cowboy CB4500, Singer 107w3, Singer 139w109, Singer 168G101, Singer 29k71, Singer 31-15, Singer 111w103, Singer 211G156, Adler 30-7 on power stand, Techsew 2700, Fortuna power skiver and a Pfaff 4 thread 2 needle serger.
Members CustomDoug Posted March 2, 2013 Author Members Report Posted March 2, 2013 Clutch Motor Bogging Down On Skiving Machine ? Can you see or hear the motor loosing RPM, or is the belt slipping on the pulleys? Yes, when this happens I can see and hear it loosing RPM and the torque disappears at the same time. I think it's an adjustment thing.. as this has happened after making changes to the head. Quote Does Anyone Know Where the Love of God Goes When the Waves Turn Minutes to Hours?
Members CustomDoug Posted March 2, 2013 Author Members Report Posted March 2, 2013 A 3450 RPM motor produces most of its power at very high speeds only. You would be better off with a 1725 RPM 1/2 HP, 550 watt motor. That's what was in my USM Puma skiver, which I sold years ago. This is the motor that came with this skiving machine but I think your point's a good one. Is your 1725RPM motor a clutch or servo motor? I've been thinking about replacing this one with a Servo as I've had good luck with them on my sewing machines. But then again, I don't need the speed adjustment of the servos necessarily on a skiver. I don't suppose changing the pulley to a smaller one on this clutch motor would be any good? It actually seems a little slow as it is... until the speed builds up. Quote Does Anyone Know Where the Love of God Goes When the Waves Turn Minutes to Hours?
Members CustomDoug Posted March 2, 2013 Author Members Report Posted March 2, 2013 ...turn the skiver by hand with the motor turned of and your foot on the pedal to see if every thing turns freely if it is free there is something wrong with the motor I'll try that tomorrow.. I guess this would also tell me if the brake is set correctly too ... you would be better of changing to a 4 pole motor any way. Yea, but I only have 110v in my garage, so I couldn't do "4 pole" - assuming that's 220v. ...Single phase motors have no start up torque and depending on type have separate start up windings these have very little torque and just spin the motor up to speed Another point for getting myself a Servo motor. Quote Does Anyone Know Where the Love of God Goes When the Waves Turn Minutes to Hours?
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