Servo motor quit? Why?

[DavidMillsSaddlery]

Spent the morning setting this up on my Union Lockstitch, and 5 minutes into using it it starts making this noise, and then quit spinning? 

 

[DavidMillsSaddlery]

Just replaced the bushing things? Electrical stuff? And still no go? 

[kgg]

Is this a new servo or a used one? Are you getting a funny / burned smell from the motor. If so, unplug it for safety and possible fire hazard reasons. If it is a new one, you should contact the seller. If it is a used one, you are probably going too have to replace it.

kgg

[Matt S]

Hard to tell but is the spindle turning while the pulley remains stationary? If so it could have a few different causes. All the sewing motors I've worked on have a key which keeps the pulley and spindle locked together. First thing would be to check that's fully engaged into the keyway slot in the bore of the pulley. They key will either be a small square-section rod under an inch long or a semi-circular piece about 3/4" across.

[dikman]

Video was a bit short (in both length and detail) but at the end like Matt said it sounded like the motor was still spinning with no load.

[DSloop]

First servo motor (500 watt)  I bought lasted a month. It just would not run, have no idea what happened. The next one was a Consew 750 watt unit, it is bigger and has worked flawlessly.

[DavidMillsSaddlery]

Sorry for lack of details! This is a Family Brand... I believe it’s a 1/2 HP that I bought 5 or so years ago for a 31-15! It’s only got maybe two pair of chaps on it? Maybe an hour of sewing? 

The spindle and the shaft have both quit spinning, thenbthat noise was never there? 

This may be “self inflicted” as I tied the clutch activation arm all the way down, to keep the motor at a constant speed, and was hoping to use the clutch that’s built into the Union Lockstitch! 

Edited April 8, 2019 by turbotexas

[DavidMillsSaddlery]

31 minutes ago, DSloop said:

First servo motor (500 watt)  I bought lasted a month. It just would not run, have no idea what happened. The next one was a Consew 750 watt unit, it is bigger and has worked flawlessly.

I ordered a Consew from Amazon! I think it’s the 3/4 HP 7500 one? It was supposed to arrive today, but I left for work at 4:00 and it still wasn’t there? 

[dikman]

Got me curious. As servos don't have a clutch I assume you meant the actuating arm that goes to the foot pedal, the idea being that when you turned it on it just went to max speed (or whatever you set as max speed) straight away. If you take the belt off what happens to the motor? Does it run?

[DavidMillsSaddlery]

20 hours ago, dikman said:

Got me curious. As servos don't have a clutch I assume you meant the actuating arm that goes to the foot pedal, the idea being that when you turned it on it just went to max speed (or whatever you set as max speed) straight away. If you take the belt off what happens to the motor? Does it run?

I’ll have to investigate this when I get home! I drive a truck for a living, and I had to leave town for a few days! 

[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

[DavidMillsSaddlery]

6 hours ago, dikman said:

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.

I replaced the brushes, to no avail! Just seemed quieter, but that could be because it had time to cool off? 

[dikman]

What happens if you turn the shaft by hand?

[DavidMillsSaddlery]

3 hours ago, dikman said:

What happens if you turn the shaft by hand?

I haven’t been home all week, and I may be another few weeks befor I can get back! I do heavy haul trucking, and I fell into some windmill work...

[dikman]

Guess we'll have to wait for the next installment.