Free Wheeling Servo Motors For Sewing Machines

[Ferg]

Just my .02

I have no problem with the brake, anywhere, it may be because I sew slower than some.

Anyway my speed dial and peddle seem to like each other. I can barely touch the peddle and it releases the brake enough to free wheel.

Perhaps Wiz's suggestion of loosening the bolt on the brake just slightly might be all you need.

ferg

[Wizcrafts]

What we need is a motor that applies a cork brake when you press down on the back of the pedal and hold it down with your heel, or by a spring on the motor's control arm (like clutch motors do). This would release as soon as you moved the pedal forward any amount. After about 1/2 inch (adjustable +/-) of free motion (like a clutch motor), the motor would begin to drive the belts.

What I am describing combines the best mechanical features of a clutch motor with the full range speed control of a good servo motor.

[billymac814]

I think for certain machines that would make sense however I'm particularly talking about my patcher that is used strictly for doing repairs. I more often than not use the handwheel so I can get the needle in the same holes or a number of other reason. Most of the time these items only need a few stitches and a lot of them are in akward spots. The motor is there for longer runs and straighter runs where I can open up. If the brake is in place it prevents easy use of the hand wheel. There are times when trying to repair large suitcases where I'm in very akward positions and the suitcase is nearly resting on the peddle so trying to hold it while trying to crank the wheel and awkwardly trying to get my foot to the peddle to release the brake feels like I'm playing a version of twister.

With all that being said I don't have a speed reducer on it and even the slowest speed is too fast, I can feather it on long runs where theres enough momentum but the machine takes more torque in the position of the revolution where it lifts the foot so its not as easy at slow speeds I almost have to pump the peddle which almost feels like I'm using the old treadle.

On my other machines where the motor does nearly all of the work the brake is fine and it doesn't bother me because the need to use the handwheel is very rare.

I hope that makes sense, I'm not saying that brakes are terrible and shouldn't be there, just for my one particular purpose it is more of a hindrance than anything.

[billymac814]

What we need is a motor that applies a cork brake when you press down on the back of the pedal and hold it down with your heel, or by a spring on the motor's control arm (like clutch motors do). This would release as soon as you moved the pedal forward any amount. After about 1/2 inch (adjustable +/-) of free motion (like a clutch motor), the motor would begin to drive the belts.

What I am describing combines the best mechanical features of a clutch motor with the full range speed control of a good servo motor.

Yes that would be perfect. That would give you the option of having it or not basically.

[stelmackr]

Other Bob,

You'll have to report your findings, I have no idea if other motors have the same kind of brake so it might help others to post the brand. The one I did was a Family non digital type with the knob on the front. Of course we may be the only 2 people that don't want the brake on there??

OK, here is my report: I could not be happier. The modification you suggested worked identically for me.

I sew quite slowly, so the idea that I need to stop on a dime is not needed. If I ever do need that feature or if I sell the machine, I can easily reinstall the cork clutch plate and will require no adjustments.

My servo motor was a Kingmax, Electronic Servo Motor, Model: KM-550W. The only safety precaution I took was to unplug the sewing machine before I started. Here are the photos:

Back of servo motor:

End plate removed (held by three screws):

Cork clutch engaged on flywheel (keeps servo and sewing machine stopped):

Cork clutch removed (two screws held it in):

Cork clutch with the two screws removed:

Bob Stelmack

www.pslac.org

[billymac814]

That looks identical to mine. I'm super happy with mine so far, its much better for me now. I just threw the brake pad and screws in the drawer in case I ever need it or sell it.

[Primosand]

I see that this is an old thread. It deals with disabling the brake on the old style 550 watt servos which have a simple removable brake pad. I just aquired an Adler 220 76-273 and I'm adding a 750 watt servo and a 9" speed reducer. I bought a Consew csm-3000 for about $150.

My problem with this new Censew CSM-3000 servo is the braking system. I want to disable it like I did on all of my Consew 550 watts servos (like the ones pictured above) but I cant figure out how to do it. these newer style 775 watt servos have I believe a magnetic brake rather then a mechanical brake pad of the older models. Has anyone figured out how to disable these magnetic brakes (if that's what is actually is) ???

Can anyone explain how to disable the braking system on these newer style 750 watt servos? Also I'd like to hear your opinion on  ..... why they put these undesirable brakes on sewing machine servos

 

 

this screen shot is what I bought or ordered off Amazon. But it's not quite what they sent me.

 

this is what they sent me. It has four front buttons rather then two.

so if you know how to disable the braking system on this type of 750 watts Censew servo motor please let me know.

thanks

[Constabulary]

Not possible afaik. Let me guess the speed reducer makes it harder to turn the hand wheel by hand. If so I think the reduction is too big. I have the same issue on my Singer 45D91. The big reduction makes it hard to turn the hand wheel. I don´t have the problem on other machines with smaller reduction.

[Primosand]

Constabulary thanks for your response but I don't understand what you are getting at. what is: (Not possible "afaik")

The hand wheel turns just fine with or without the new speed reducer. Much to my apposite delight the hand wheel turns with very little effort at all (this is my 1st ever Adler, I've never even been in the same room as an Adler until this purchase.)

A servo motor with a speed reducer pulley is how I set up all my industrial machines past and present. It makes the machine slow with additional torque. I works so well that on my Consew 226r I can watch thread being pulled through the eye of the needle as I sew (slowly) while allowing me to punch through just about anything.

If I didn't explain why I want to disable the brake is it because this servo motor starts a speed of 500 rpm and goes up to maybe 4500. So when you start this motor you are already going a min of 500 rpm. That is unacceptable. I want to start at zero and slowly climb up to 500 or higher. (I have no need for speed). Removing or disabling the braking system on servos works great for me and the way I like to sew.

My question is does anyone know how to disable the braking system on these Consew CSM3000 or similar 750 watt servo motor ????

thanks

My question is does anyone know how to disable the braking system on these Consew CSM3000 or similar 750 watt servo motor ????

thanks

Edited June 24, 2021 by Primosand

[stelmackr]

I might have also misunderstood the question.  Here is a manual (not exactly your model number) that gives directions to change the slow start up speed:

 

https://www.consew.com/Files/112347/InstructionManuals/CSM1000.pdf