Members Constabulary Posted March 9, 2021 Members Report Posted March 9, 2021 (edited) Just a tinkering idea.... I´m not an electrician so I wonder if it possible to add a soft start module (as on table saws) to our sewing machine servos. Will it improve the comfort and does it make sense at all? Edited March 9, 2021 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
Members Gregg From Keystone Sewing Posted March 9, 2021 Members Report Posted March 9, 2021 Many positioning motors have a soft start option. The idea is that the first couple of stitches are loose, and will give the machine time to catch up to prevent the needle thread from coming out. It's not just for comfort. Quote Industrial sewing and cutting, parts sales and service, family owned since 1977, Philadelphia, Pennsylvania USA, 215/922.6900 info@keysew.com www.keysew.com
Members sbrownn Posted March 9, 2021 Members Report Posted March 9, 2021 6 hours ago, Constabulary said: Just a tinkering idea.... I´m not an electrician so I wonder if it possible to add a soft start module (as on table saws) to our sewing machine servos. Will it improve the comfort and does it make sense at all? If you are using a speed reducer you probably don't need soft start. If not, probably not too. I have tried it both ways and had no problems either way. Quote
Members Constabulary Posted March 9, 2021 Author Members Report Posted March 9, 2021 I know - I have speed reducers on all my machines. I want to add a soft start to my table saw so this just popped up in my head... just an idea... don´t know if it is possible at all. 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
Members dikman Posted March 9, 2021 Members Report Posted March 9, 2021 Stop thinking so much, Constabulary, you'll give yourself a headache! Quote Machines wot I have - Singer 51W59; Singer 331K4; Seiko STH-8BLD; Pfaff 335; CB4500. Chinese shoe patcher; Singer 201K (old hand crank)
Members sbrownn Posted March 10, 2021 Members Report Posted March 10, 2021 5 hours ago, Constabulary said: I know - I have speed reducers on all my machines. I want to add a soft start to my table saw so this just popped up in my head... just an idea... don´t know if it is possible at all. Does your table saw have a motor hanging off a belt that drives the blade arbor or is it direct drive? Soft start has the advantage of lowering the starting current of a motor so if your motor has a running current that is close to the capacity of the breaker, it keeps the breaker from tripping when it starts; starting current is significantly higher than running current. Quote
Members Constabulary Posted March 10, 2021 Author Members Report Posted March 10, 2021 Was just a wild idea... if you don´t ask you will not know the answer Maybe a brain fart. 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
Members Gymnast Posted March 10, 2021 Members Report Posted March 10, 2021 Sorry, but you cannot do that to a servo motor. If you do it on the input side to the servo motor electronics, the electronics will not get the right voltage to operate. If you do it between the servo electronics and the motor, it will create all sorts of problems. The voltage here got a lot of higher frequencies, that the slow start electronics cannot handle. Quote Sewing Machines in Detail, YouTube channel
DonInReno Posted March 11, 2021 Report Posted March 11, 2021 Honestly I don’t know much about motors and the only soft start motors I knew existed were three phase, but this manual popped up for a single phase motor soft start thing-a-majig. https://www.baldor.com/Shared/manuals/834-602.pdf Quote
Members Constabulary Posted March 11, 2021 Author Members Report Posted March 11, 2021 (edited) Don, my original idea (or brain fart) was this thingy here which goes into single phase table saws: https://www.ebay.de/itm/Vollmetall-Sanftanlauf-Anlaufwiderstand-12A-mit-Osen-Softstart-Soft-Start/143616841340 I´m not really following the idea for my sewing servo cause I have no need but it just popped up in my head so I asked. You never know. Edited March 11, 2021 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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