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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Help please with PWM sewing machine pedal
I have an old Singer sewing machine. It is a model 221, AKA a
Featherweight. I got the thing at a garage sale for 5 or 10 bucks and everything was there but the foot pedal motor control. So I bought a modern PWM style control instead of an old carbon disc style one because it was supposed to be better. At least I think the new one is PWM. It is very light and doesn't get hot after lots of use. I think it may be under performing though because the little machine seems to run too slow. I did go through the machine, cleaning and adjusting it. It was dirty inside, had old congealed lubricants clogging and sticking stuff up. Things were also really out of adjustment so it would not have been able to sew even if it was turning freely. The machine now turns quite freely. It is oiled with the proper oil and the motor, which I also cleaned and lubricated, is lubricated with the proper grease. So after all that the machine still runs too slowly. At least in my opinion. The motor just doesn't seem to have much oomph and I'm wondering if maybe the foot pedal control is not delivering enough current and/or voltage. Since the control is PWM output would an analog meter like my Simpson 260 be a good tool to measure the current and voltage? Or maybe someone here knows already about these machines and the foot controls and can tell me what to expect from a properly operating control. And the best way to check it. Thanks, Eric --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#2
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Help please with PWM sewing machine pedal
Ummmm ..... PWM controls are for DC motors for the most part. When used on AC motors, they will cut speed by some amount just by being in place. Motors are funny things. They draw rated current even when throttled, which is why VFDs are preferred for AC motors. Not so much the control heating up as the motor heating up if fed with a PWM device.
https://www.amazon.com/Sew-link-Feat...61777480&psc=1 Yes. There are some featherweight motors that are both AC or DC - but it will run better on AC. Peter Wieck Melrose Park, PA |
#4
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Help please with PWM sewing machine pedal
Pimpom wrote:
------------ I've seen designs - but not the actual product - of cheap motor controls that can provide only half the power at full throttle. This is because the phase-controlled device is an SCR without any pre-rectification and conduct for only half of each AC cycle.. ** SCR speed controls for AC/DC motors are brilliant things - cos they allow for back EMF feedback as well as very low speeds. The feedback keeps the speed steady with varying loads - while trigger speed controls built into drills use triacs and give no such benefit. The sewing machine foot controller is likely a triac type - which is a form of PWM too. ...... Phil |
#5
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Help please with PWM sewing machine pedal
On 8/21/2020 11:34 AM, wrote:
I have an old Singer sewing machine. It is a model 221, AKA a Featherweight. I got the thing at a garage sale for 5 or 10 bucks and everything was there but the foot pedal motor control. So I bought a modern PWM style control instead of an old carbon disc style one because it was supposed to be better. At least I think the new one is PWM. It is very light and doesn't get hot after lots of use. I think it may be under performing though because the little machine seems to run too slow. I did go through the machine, cleaning and adjusting it. It was dirty inside, had old congealed lubricants clogging and sticking stuff up. Things were also really out of adjustment so it would not have been able to sew even if it was turning freely. The machine now turns quite freely. It is oiled with the proper oil and the motor, which I also cleaned and lubricated, is lubricated with the proper grease. So after all that the machine still runs too slowly. At least in my opinion. The motor just doesn't seem to have much oomph and I'm wondering if maybe the foot pedal control is not delivering enough current and/or voltage. Since the control is PWM output would an analog meter like my Simpson 260 be a good tool to measure the current and voltage? Or maybe someone here knows already about these machines and the foot controls and can tell me what to expect from a properly operating control. And the best way to check it. Thanks, Eric --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus I bought one of those for my wife almost 60 years ago. She still uses it for all her sewing. I bought a complete rebuild kit a few years ago and still have the leftover pieces. The biggest problem is lint and dust collection, but you have taken care of that. Have you actually tried sewing cloth with the machine. My wife seldom operates it at full speed. Sewing with the machine is an art, not a race. And the foot control is a wire-wound resistor with a slider. Paul |
#6
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Help please with PWM sewing machine pedal
On Sat, 22 Aug 2020 12:22:34 -0700, Paul Drahn
wrote: On 8/21/2020 11:34 AM, wrote: I have an old Singer sewing machine. It is a model 221, AKA a Featherweight. I got the thing at a garage sale for 5 or 10 bucks and everything was there but the foot pedal motor control. So I bought a modern PWM style control instead of an old carbon disc style one because it was supposed to be better. At least I think the new one is PWM. It is very light and doesn't get hot after lots of use. I think it may be under performing though because the little machine seems to run too slow. I did go through the machine, cleaning and adjusting it. It was dirty inside, had old congealed lubricants clogging and sticking stuff up. Things were also really out of adjustment so it would not have been able to sew even if it was turning freely. The machine now turns quite freely. It is oiled with the proper oil and the motor, which I also cleaned and lubricated, is lubricated with the proper grease. So after all that the machine still runs too slowly. At least in my opinion. The motor just doesn't seem to have much oomph and I'm wondering if maybe the foot pedal control is not delivering enough current and/or voltage. Since the control is PWM output would an analog meter like my Simpson 260 be a good tool to measure the current and voltage? Or maybe someone here knows already about these machines and the foot controls and can tell me what to expect from a properly operating control. And the best way to check it. Thanks, Eric --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus I bought one of those for my wife almost 60 years ago. She still uses it for all her sewing. I bought a complete rebuild kit a few years ago and still have the leftover pieces. The biggest problem is lint and dust collection, but you have taken care of that. Have you actually tried sewing cloth with the machine. My wife seldom operates it at full speed. Sewing with the machine is an art, not a race. And the foot control is a wire-wound resistor with a slider. Paul Yeah, I do sew with it. That's why I bought it. I have a larger machine that is really heavy and a real chore to set up. That little featherweight is a joy to use. It is supposed to be able to sew leather but the motor stalls. Looking online for information about this machine I found out all sorts of folks collect them and actually use them a lot. I also found a zig zag attachment that I use when patching holes in my work shirts. Eric |
#7
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Help please with PWM sewing machine pedal
On Friday, 21 August 2020 19:34:42 UTC+1, wrote:
I have an old Singer sewing machine. It is a model 221, AKA a Featherweight. I got the thing at a garage sale for 5 or 10 bucks and everything was there but the foot pedal motor control. So I bought a modern PWM style control instead of an old carbon disc style one because it was supposed to be better. At least I think the new one is PWM. It is very light and doesn't get hot after lots of use. I think it may be under performing though because the little machine seems to run too slow. I did go through the machine, cleaning and adjusting it. It was dirty inside, had old congealed lubricants clogging and sticking stuff up. Things were also really out of adjustment so it would not have been able to sew even if it was turning freely. The machine now turns quite freely. It is oiled with the proper oil and the motor, which I also cleaned and lubricated, is lubricated with the proper grease. So after all that the machine still runs too slowly. At least in my opinion. The motor just doesn't seem to have much oomph and I'm wondering if maybe the foot pedal control is not delivering enough current and/or voltage. Since the control is PWM output would an analog meter like my Simpson 260 be a good tool to measure the current and voltage? Or maybe someone here knows already about these machines and the foot controls and can tell me what to expect from a properly operating control. And the best way to check it. Thanks, Eric Simple: connect it up without the controller to see how fast it goes. Didn't know zigzag adaptors existed for ancient machines Some early electric machines are quite slow. NT |
#8
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Help please with PWM sewing machine pedal
Paul Drahn wrote:
================= I bought one of those for my wife almost 60 years ago. She still uses it for all her sewing. I bought a complete rebuild kit a few years ago and still have the leftover pieces. The biggest problem is lint and dust collection, but you have taken care of that. Have you actually tried sewing cloth with the machine. My wife seldom operates it at full speed. Sewing with the machine is an art, not a race. And the foot control is a wire-wound resistor with a slider. ** Some Singer models use that and others have triac controllers. One I saw recently had an "air controller" - model 6233. https://www.shopgoodwill.com/Item/85245157 Yep, the foot pedal fed compressed air to the machine via a rubber tube. https://www.perfecttimingsewing.com/...oot-controller Not sure how that activated a triac circuit. ...... Phil |
#9
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Help please with PWM sewing machine pedal
On 8/22/2020 1:34 PM, wrote:
On Sat, 22 Aug 2020 12:22:34 -0700, Paul Drahn wrote: On 8/21/2020 11:34 AM, wrote: I have an old Singer sewing machine. It is a model 221, AKA a Featherweight. I got the thing at a garage sale for 5 or 10 bucks and everything was there but the foot pedal motor control. So I bought a modern PWM style control instead of an old carbon disc style one because it was supposed to be better. At least I think the new one is PWM. It is very light and doesn't get hot after lots of use. I think it may be under performing though because the little machine seems to run too slow. I did go through the machine, cleaning and adjusting it. It was dirty inside, had old congealed lubricants clogging and sticking stuff up. Things were also really out of adjustment so it would not have been able to sew even if it was turning freely. The machine now turns quite freely. It is oiled with the proper oil and the motor, which I also cleaned and lubricated, is lubricated with the proper grease. So after all that the machine still runs too slowly. At least in my opinion. The motor just doesn't seem to have much oomph and I'm wondering if maybe the foot pedal control is not delivering enough current and/or voltage. Since the control is PWM output would an analog meter like my Simpson 260 be a good tool to measure the current and voltage? Or maybe someone here knows already about these machines and the foot controls and can tell me what to expect from a properly operating control. And the best way to check it. Thanks, Eric --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus I bought one of those for my wife almost 60 years ago. She still uses it for all her sewing. I bought a complete rebuild kit a few years ago and still have the leftover pieces. The biggest problem is lint and dust collection, but you have taken care of that. Have you actually tried sewing cloth with the machine. My wife seldom operates it at full speed. Sewing with the machine is an art, not a race. And the foot control is a wire-wound resistor with a slider. Paul Yeah, I do sew with it. That's why I bought it. I have a larger machine that is really heavy and a real chore to set up. That little featherweight is a joy to use. It is supposed to be able to sew leather but the motor stalls. Looking online for information about this machine I found out all sorts of folks collect them and actually use them a lot. I also found a zig zag attachment that I use when patching holes in my work shirts. Eric Wife has trouble patching denim with hers, if more than 2-3 layers thick. Original motor is not powerful enough. She has to help the machine by hand. Paul |
#10
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Help please with PWM sewing machine pedal
Paul Drahn wrote:
I bought one of those for my wife almost 60 years ago. She still uses it for all her sewing. I bought a complete rebuild kit a few years ago and still have the leftover pieces. The biggest problem is lint and dust collection, but you have taken care of that. Have you actually tried sewing cloth with the machine. My wife seldom operates it at full speed. Sewing with the machine is an art, not a race. And the foot control is a wire-wound resistor with a slider. My mother hated those. She would have me install one of the carbon pile type, because it gave a smoother control. I would save the old ones and add a few extra disks to them to return them to like new condition. The wirewound controller changes speed in steps, not in a linear fashion. I also replaced old motors when they no longer had enough torque for thicker material. She sewed six to ten hours a day, and wore out eight commercial grade machines. -- Never **** off an Engineer! They don't get mad. They don't get even. They go for over unity! ;-) |
#11
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Help please with PWM sewing machine pedal
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#12
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Help please with PWM sewing machine pedal
On Sunday, 23 August 2020 03:26:43 UTC+1, Paul Drahn wrote:
Wife has trouble patching denim with hers, if more than 2-3 layers thick. Original motor is not powerful enough. She has to help the machine by hand. Paul Damn. I once sewed 12 layers of denim with my oldest one, 1960. It struggled but got there. NT |
#13
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Help please with PWM sewing machine pedal
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#14
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Help please with PWM sewing machine pedal
Did you mess up the timing of the motor by chance? The angle of the brushes makes a huge difference. maybe? How's the motor run with no speed controller? The brushes are sleeved and fit in only one way. About the only other 'unusual' possibility is that Eric has a Euro version - which has flat paper caps in the motor. They should be REMOVED and NOT REPLACED! Peter WIeck Melrose Park, PA |
#15
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Help please with PWM sewing machine pedal
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