How To Slow It Down...

[brmax]

Thanks for the reply, it helped steer me away from thinking any capacitor issues. 

I have to mention an investment in a Servo motor will be a good choice. It will help a serious amount in a slower machine speed.  If an extreme reduction is needed the use of a pulley speed reducer is warranted. These can be purchased and or built, there are some very new styles. These new styles have some benefits, in either case the reducers do have a steep cost. 

A point to think about is the factory handwheel pulley, most are very small diameter. This as you know is for speed, as garmet sewing is all about putting out the products, a lot!

 

Good day

Floyd

[laether]

13 hours ago, Uwe said:

There's also simple spring and lever physics at work. The longer the lever, the less force it takes to move something. The more you deflect a spring, the more force it takes. In the bottom position of that wing nut, you have a long lever and short spring deflection, resulting in relatively low force/torque required to move things. In the uppermost position, you have half the lever and twice the spring deflection. So it may take four times the force (torque) to walk the feet in the upper wing nut position. Once things start moving, the momentum of all the rotating masses help provide torque.

Thank you @Uwe again! This is just the kinda physics I was thinking is involved here, well put! =)

Thanks to others aswell. I'm going to invest on new servo motor.

Is there a thread about servos? I found this, but its quite short:
http://leatherworker.net/forum/topic/80458-servo-motor/

I would appreciate if you could advise me a bit on them? What kind of servo do I need? Here's the specs:

-I'm in EU
-do not want cheapest chinese one, would prefer buying from Germany etc.
-but also wouldnt need the most expensive either...I guess something in the middle...
-will take the motor & my machine to a maintenance shop, just would prefer buying the motor myself, to save some €s

 

Edited May 2, 2018 by laether

[Northmount]

@laether Lots of post about servos.  Try a google search "site:leatherworker.net servo" without the quotes.  Add additional words to refine your search.

Tom

[laether]

10 hours ago, Northmount said:

@laether Lots of post about servos.  Try a google search "site:leatherworker.net servo" without the quotes.  Add additional words to refine your search.

Tom

yes, thanks!

[Uwe]

Efka in Germany (http://efka.net) makes really good servo motor and controller systems. They may not qualify for "in the middle" status. 

[laether]

1 hour ago, Uwe said:

Efka in Germany (http://efka.net) makes really good servo motor and controller systems. They may not qualify for "in the middle" status. 

thanks, already found them...and yes, a bit over my budget...

[brmax]

What other company’s are in your locations.

Just thinking here and curious if somethings in the U.K. Especially within a 250.euro range and is obtainable with reasonable shipping or freight charges.

 

Good day

Floyd

[JessH]

On 9/3/2014 at 2:35 PM, CowboyBob said:

I've always just used wheel bearing grease or Vaseline on the clutch pad(about a teaspoon)just smear it around.As a quick fix machine oil on the pad will work.They grab because they dry out so any lube helps it to slip & doesn't hurt it at all.

This comment gives me real hope of more low speed control? I've already put the smallest direct reducer wheel on, (can't get the tri-pulley in the UK I would love to have) so the top speed no longer scares me to death. It's the first machine in my life I've ever been scared of, I had no idea a sewing machine could go that fast!. Sometimes I can control the lower speed, other times no way, though I'm sure my feet are doing the same thing. As someone suggested above, my belt is on the point of slipping, though I didn't do this on purpose, and had been wondering if that was part of the problem? This grabbing of dry clutch would make perfect sense, as I really feel the machine 'grabs' suddenly and accelerates like a Ferrari on a rally. Now just have to work out how to get the grease/oil onto the clutch? Any suggestions as to how to do that for a non engineer but practical person very gratefully received?

[CowboyBob]

Can you post a pic of the pulley side of your motor?

Edited August 25, 2018 by CowboyBob

[chrisash]

Don't forget that most high speed machines need the high speed to work the automatic oiling