Members CowBoyOUTLAW Posted October 6, 2022 Members Report Posted October 6, 2022 What does a needle position servomotor do on leather sewing machine? See below video link on YouTube. Quote
Moderator Wizcrafts Posted October 6, 2022 Moderator Report Posted October 6, 2022 48 minutes ago, CowBoyOUTLAW said: What does a needle position servomotor do on leather sewing machine? Facts only answer As the video demonstrated, it allows the operator to precisely stop with the needle either fully up or fully down, no matter the speed you were sewing at. This means that whether you are sewing 1 stitch per second or 30, pressing down with your toe or heel in the designated manner will cause the machine to come to a dead halt with the needle up or down. This would be a useful combination for an operator who lacks good foot control (medical or injury causes). Editorialized answer I have the same type of machine in the video; a Cowboy cb4500. It has a 3:1 speed reducer and an analog servo motor with a simple rotary switch to limit the top speed. It ramps up smoothly from zero to the maximum speed as set by the knob. I can easily operate my machine at less than one stitch per second, then floor it on straightaways to sew at 10 or 15 stitches per second. As I approach corners, turns, or the end of the stitch line, I simply back off the speed pedal until I reach the end, then either reverse into the previous few stitches, or move the stitch length lever to the zero movement position and double tap it to lock in the threads. In my learned opinion, there is absolutely no need for a normal user, with good foot muscle control, on this type of machine (Juki 441 clone), to install a needle positioner and more expensive digital servo motor if it has a 3:1 reducer between the motor and machine. 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 Constabulary Posted October 6, 2022 Members Report Posted October 6, 2022 Well, nothing really new in this video. However - does the needle positioning work in combination with a speed reducer? Quote ~ Keep "OLD CAST IRON" alive - it´s worth it ~ Machines in use: - Singer 111G156 - Singer 307G2 - Singer 29K71 - Singer 212G141 - Singer 45D91 - Singer 132K6 - Singer 108W20 - Singer 51WSV2 - Singer 143W2
kgg Posted October 6, 2022 Report Posted October 6, 2022 4 hours ago, Constabulary said: does the needle positioning work in combination with a speed reducer? Great question, as some people have had problems in the past when trying to combine a speed reducer with a needle positioner on a electronic controlled servo motor. I didn't see one on the second machine with the speed reducer. 8 hours ago, CowBoyOUTLAW said: What does a needle position servomotor do on leather sewing machine? Since price is always a factor what is the price of the servo motor and needle positioner? kgg Quote Juki DNU - 1541S, Juki DU - 1181N, Singer 29K - 71(1949), Chinese Patcher (Tinkers Delight), Warlock TSC-441, Techsew 2750 Pro, Consew DCS-S4 Skiver
Members GritMercantile Posted October 6, 2022 Members Report Posted October 6, 2022 We have on our Techsew 4800 Pro. The EPS is invaluable for us and speeds up the process. I would agree that if you have good treadle control and EPS may not be needed. Is it nice to have? Yes, Have to have? No. Would we purchase another machine without it? No. Quote
Members CowBoyOUTLAW Posted October 8, 2022 Author Members Report Posted October 8, 2022 On 10/6/2022 at 10:22 PM, GritMercantile said: We have on our Techsew 4800 Pro. The EPS is invaluable for us and speeds up the process. I would agree that if you have good treadle control and EPS may not be needed. Is it nice to have? Yes, Have to have? No. Would we purchase another machine without it? No. “How many times a day you need to remove your hand from workpiece to the hand wheel for lifting needle, then remove the material?”EPS great for time saving, also avoid losing stitch when you turn material for changing direction. On 10/6/2022 at 7:07 PM, kgg said: Great question, as some people have had problems in the past when trying to combine a speed reducer with a needle positioner on a electronic controlled servo motor. I didn't see one on the second machine with the speed reducer. Since price is always a factor what is the price of the servo motor and needle positioner? kgg Price is higher than other motor, due to its high performance. Quote
Members CowBoyOUTLAW Posted October 8, 2022 Author Members Report Posted October 8, 2022 On 10/6/2022 at 11:41 AM, Wizcrafts said: Facts only answer As the video demonstrated, it allows the operator to precisely stop with the needle either fully up or fully down, no matter the speed you were sewing at. This means that whether you are sewing 1 stitch per second or 30, pressing down with your toe or heel in the designated manner will cause the machine to come to a dead halt with the needle up or down. This would be a useful combination for an operator who lacks good foot control (medical or injury causes). Editorialized answer I have the same type of machine in the video; a Cowboy cb4500. It has a 3:1 speed reducer and an analog servo motor with a simple rotary switch to limit the top speed. It ramps up smoothly from zero to the maximum speed as set by the knob. I can easily operate my machine at less than one stitch per second, then floor it on straightaways to sew at 10 or 15 stitches per second. As I approach corners, turns, or the end of the stitch line, I simply back off the speed pedal until I reach the end, then either reverse into the previous few stitches, or move the stitch length lever to the zero movement position and double tap it to lock in the threads. In my learned opinion, there is absolutely no need for a normal user, with good foot muscle control, on this type of machine (Juki 441 clone), to install a needle positioner and more expensive digital servo motor if it has a 3:1 reducer between the motor and machine. Thank you!! Quote
Members CowBoyOUTLAW Posted October 8, 2022 Author Members Report Posted October 8, 2022 On 10/6/2022 at 2:14 PM, Constabulary said: Well, nothing really new in this video. However - does the needle On 10/6/2022 at 2:14 PM, Constabulary said: Well, nothing really new in this video. However - does the needle positioning work in combination with a speed reducer? work in combination with a speed reducer? Thanks for your great question. We just tested, the needle position could not working well, but it is not about the synchronizer, but about mother board, we will upgrade the system ASAP Quote
Members CowBoyOUTLAW Posted October 13, 2022 Author Members Report Posted October 13, 2022 On 10/6/2022 at 7:07 PM, kgg said: Great question, as some people have had problems in the past when trying to combine a speed reducer with a needle positioner on a electronic controlled servo motor. I didn't see one on the second machine with the speed reducer. Since price is always a factor what is the price of the servo motor and needle positioner? kgg Kgg, we fixed the problem, now the Kinedyne needle position synchronizer can work perfectly with speed reducer. Quote
Members Constabulary Posted October 13, 2022 Members Report Posted October 13, 2022 (edited) So how much speed reducer reduction will this motor / needle positioner now accept? 1:2, 1:3 or even more? Does it matter how big the motor pulley is? Usually these motors comes with ~75mm pulley but most LW swap it to 40-50mm pulley. I´m just a user but not an electronics geek so this question may sound stupid (maybe not). Is there (probably) a way to adjust the "reduction acceptance" (I have no other word, sorry) in the motor management menu? That would be a great feature. Edited October 13, 2022 by Constabulary Quote ~ Keep "OLD CAST IRON" alive - it´s worth it ~ Machines in use: - Singer 111G156 - Singer 307G2 - Singer 29K71 - Singer 212G141 - Singer 45D91 - Singer 132K6 - Singer 108W20 - Singer 51WSV2 - Singer 143W2
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