Singer 7-33 Shuttle and Race

[Silky]

There is plenty of clearance between the shuttle and the race on my 7-33.

Is this by design ? or is there excessive wear ? How to determine the amount of wear ?

I assume it should run freely but how free ?

Thanks

[Silky]

Please excuse the bump, I misspoke . I DO know how the measure the wear precisely.

The MAX allowable difference, or clearance, between the OD of the shuttle and the ID of the race is what I'd like the info on.

And the thickness of the shuttle compared to the depth of the pocket that it runs in. I can move shuttle towards and from the needle by nearly .5 mm.  I don't want to go too deep into the repairs if these major components are worn beyond usefulness.

Thanks much for any info.

[Bert51]

I have an Adler 105-6, which uses a similar type of Shuttle and when I first used it I thought it was worn out, it made what I thought was a lot of noise, but as I used it more I got used to the click clack and I can tell if my tensions are out by the sound it's making or not making.

Bert.

[Silky]

That is good to know .... I guess     I'm sure there is some wear there, but it does seem to sew OK, just that the hook can rub the needle if set to spec. This old 7 appears to have  many miles on it. May find out more later, thanks Bert. Being a precision machinist, I get a little (lot) picky at times. I can make almost anything exactly as it needs to be .... I just need to find out or determine exactly HOW it needs to be. 

Thanks again Bert,

Good day.

[Bert51]

These Shuttles must have clearance to allow to thread to pass around between the shuttle and the driver, if they don't the thread will not pass between them.

If you want the machine to use large thread the more clearance it must have and clearance equals noise as the driver pushes the shuttle one way them back again.

Bert.