Servo motor quit? Why?

[dikman]

Work has a habit of getting in the way of the important things!

[DavidMillsSaddlery]

Just now, dikman said:

Work has a habit of getting in the way of the important things!

Right!?

 

[Gregg From Keystone Sewing]

It sounds OK actually.  Is the motor shaft spinning on the pulley?

 

 

[brmax]

You may have to make a longer video, especially showing your transmission to the machine head, that sounds interesting.

I understand your idea of speed control, then using some existing pulley transmission system.

Although some more views or photos of all this is really required. It can sure help me understand better, your reason the servo is not slow enough or the control is not, and requiring a constant other setting.

As this control part is something many of us have had to address in several ways. 

 

Good day

Floyd

[Rolandranch]

My servo motor went out a while back. Turned out the circuit board burned out, a common problem with servo motors. Replaced the board and running great.

[DavidMillsSaddlery]

10 hours ago, Gregg From Keystone Sewing said:

It sounds OK actually.  Is the motor shaft spinning on the pulley?

 

 

Hi Greg, no the shaft itself is not spinning? 

8 hours ago, brmax said:

You may have to make a longer video, especially showing your transmission to the machine head, that sounds interesting.

I understand your idea of speed control, then using some existing pulley transmission system.

Although some more views or photos of all this is really required. It can sure help me understand better, your reason the servo is not slow enough or the control is not, and requiring a constant other setting.

As this control part is something many of us have had to address in several ways. 

 

Good day

Floyd

Yes, I will spend more time with this, when I get back home... im out working for a spell! 

[dikman]

Odd. It sounded like the motor was spinning in your vid. If that's the case then I'd say the electronics are shot?

[DavidMillsSaddlery]

On 4/10/2019 at 9:48 PM, dikman said:

Odd. It sounded like the motor was spinning in your vid. If that's the case then I'd say the electronics are shot?

Yes, and when it was working, it never made that much noise! 

[dikman]

I've been listening to it again (and again, and again....). It looks like a brush motor (I think I see one of the brush mounts in front?) so I wonder if the brush(es) are worn out or broken.  It certainly sounds like something is spinning, though. Quite perplexing.

[SARK9]

The noises it makes suggest it IS spinning when you activate the pedal....if the shaft is not free-spinning inside the pulley (broken/missing key) or loose set screw/nut/other fastener, then its possible the output shaft itself could be broken at a point past the brushes. Stranger things have happened.

5 hours ago, dikman said:

It looks like a brush motor (I think I see one of the brush mounts in front?)

These old-school brush motors with a max-rpm limit dial have been used in some form on sewing machines since at least the 70's....one example is seen here on the old White model 970 from way back.

 

-DC