Moderator Wizcrafts Posted January 21, 2015 Moderator Report Posted January 21, 2015 (edited) I dunno bout that. Most of the servo motors I've had don't freewheel as well as clutch motors. My Family Sew barely has 3/8 inch of toe movement on the pedal before it engages forcefully. The only way to get more usable free motion is to remove the brake pad entirely. Most clutch motors can be set for well over 3/4 inch of free motion before engaging. I mention this because I always hand wheeled my Union Lockstitch machines around corners, belt tips and fishtail patterns. Without the ability to freewheel, I would have had to depend on the ability of the motor to sew slowly enough to place the awl exactly where I wanted it, no questions asked. Also, without free motion, these motors fight your efforts to hand wheel a machine. Edited January 21, 2015 by Wizcrafts 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 steadybrook Posted January 21, 2015 Author Members Report Posted January 21, 2015 I was hoping to sew one stitch at a time around corners, also try 45 degree corner stitching. [ like pcox in the thread above , he has a servo on his randall ]. I contacted Campbell and they are just setting up a needle awl machine with a servo motor.. I am awaiting a video and reply from them. Quote
Members Gump Posted January 22, 2015 Members Report Posted January 22, 2015 Servo motors make 100% of thier torque at startup and ramp down as rpm increases. It should have no problem running your machine with the existing reduction. If you add a speed reducer, you should have time to go to the house for a tea between stitches. I have a Sew Quiet 5000 with 4/5 hp on a 153 w 103, and it will sew a stitch at a time with a 2" pulley and no speed reducer. Also very smooth on acceleration with no modifications needed. Gump. Quote
Members steadybrook Posted January 23, 2015 Author Members Report Posted January 23, 2015 Thanks Gump, Is your Sew Quiet 500 on a needle / awl machine? Quote
Members Gump Posted January 23, 2015 Members Report Posted January 23, 2015 No it is on a walking foot cyl. arm machine that will sew 3/8", and no speed reducer. Clutch motors are usually only 1/3 to1/2 hp., and because they are constant rpm, they use centrifugal force to maintain torque. Servo motors give better low rpm torque. Gump. Quote
Members steadybrook Posted January 23, 2015 Author Members Report Posted January 23, 2015 Thanks. Quote
Members pcox Posted January 27, 2015 Members Report Posted January 27, 2015 (edited) Here is my Randall with the servo motor. Said file was too big. Edited January 27, 2015 by pcox Quote
Members steadybrook Posted January 27, 2015 Author Members Report Posted January 27, 2015 Send it to me @ steadybrook@eastlink.ca and thanks. Quote
Cobra Steve Posted January 27, 2015 Report Posted January 27, 2015 We have sold many servo motors to Needle and Awl owners with no problems mounting them. Quote Thank You Steve Tayrien Leather Machine Co., Inc. 2141 E. Philadelphia St. Unit "U" Ontario, California 91761 1-866-962-9880 http://www.leathermachineco.com cobra@leathermachineco.com
Members steadybrook Posted January 28, 2015 Author Members Report Posted January 28, 2015 Thanks. Any pictures with the servo motors mounted ? Quote
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