Pulley Keeps Falling Off

[mathbishop]

I have a singer 111w153.

The lower pulls keeps falling off no matter how tight I get the small allen bolt you see pictured.

Im sure I am missing something.

[TomG]

I'm not a pro at them and my 111W155 now has a servo motor, but that looks like a clutch motor with the clutch assembly missing. I don't think that is the right pulley. The motor shaft looks like a splined shaft with a threaded end that the clutch assembly would slide onto and screw down.

Maybe Wiz will check in. He's one of the pros.

[Sunnyside Scott]

I have a singer 111w153.

The lower pulls keeps falling off no matter how tight I get the small allen bolt you see pictured.

Im sure I am missing something.

While the pulley is off, verify that the set screw can tighten beyond the inner bore of the pulley.

I don't see a piece of key stock in your picture, does the shaft have a key way cut into it?

Scott

[mathbishop]

The pulley can definitely tighten down on the shaft, but there is no designated spot for it to be tighten down on. If that makes sense.

It was working just fine for a long time. Then I started it up today and encountered that problem fairly quickly.

[TomG]

I hate to say this, but I just zoomed in on that picture and I definately see a splined shaft and what looks like a threaded end.

How have you been controlling the speed?

[mathbishop]

Cant

I hate to say this, but I just zoomed in on that picture and I definately see a splined shaft and what looks like a threaded end.

How have you been controlling the speed?

Why do you "hate to say it"

I cant really control the speed of the machine very well with it being a clutch motor.

[TomG]

That answers that. When you or whoever screwed that set screw in, it probably grabbed into those threads. Look at them and you'll probably see indentations in the threads. When the pulley came loose, it may have galled the threads and also either damaged the set screw tip or rolled the aluminum of the inside of the hole over the tip. Like Scott said, it may not be going all the way through to grip as tight as it used to.

The clutch assembly that fits there has a pulley as part of the assembly. It has a lever that links to your foot treadle. The arm pushes a pin into the center of the motor shaft to engage that clutch.

All I can think of it to replace the motor with a good servo, or if you just want to use it like it was, make sure that set screw is not damaged and that it can go all the way into the shaft hole and possibly drill a small engagement hole in the shaft for the set screw to engage... BUT, you'll likely find that the shaft is hardened and may be hard to drill

Good luck

Just saw your last post after mine... How are you starting and stopping the motor? Am I missing something?

With a clutch motor, you should be able to feather the pedal to sew from almost a single stitch at a time to full out with some practice.

[mathbishop]

Im not sure im following you, from the looks of everything nothing seems to be damaged or stripped. Nothing screws in/onto the threaded part of the shaft. The pulley screw clamps down on the part before the threading.

Maybe im just being niave but it has got to be simpler than replacing the whole motor....,

[dirtclod]

If any of the threads still out past the pulley when it's on try putting a nut on the end to hold the pulley on.

[TomG]

I must be missing something. You need to reach out to one of the pros. I am just going by what I remember seeing when I took my Singer clutch motor apart once. Had to replace a cork ring.

My observations come from seeing nothing but threads and splines on the motor shaft and no keyway on either the pulley or the shaft.

I know there are motors with the clutch mechanism between the pulley and the motor body, but I am thinking they are all smooth on the motor side of the threads with a keyway and nut to secure them.

But like I said, I am in no way a pro at these.