Singer 29-4 repair

[Sovran81]

I didnt use a dial indicator. On the old set I could 'feel' play, New I could not feel play. Check for play between the needlebar and bushing also. Too much in this area will affect stitch length and the ability for the hook to pick up the top thread. The .080" deflection(at the needle tip) that was in mine caused intermittent skipped stitches. 

[Wizcrafts]

Regarding going bobbinless, the top thread has to pass both over and under the bobbin and shuttle. In standard operation the bobbin case/shuttle holds the entire bobbin load and only exposes the loose thread on top of the case. The top thread is picked off the eye of the needle, then fed around, and over and under the shuttle. This is how it forms a type 301 lockstitch knot. This works fine when there is a bobbin in play, but fails when the thread is fed from under the bobbin, then through and out the top. In effect, the top thread captures the bottom thread twice; on top and bottom of the shuttle. The results is a chain, not a lockstitch.

[mikesc]

That is one of the clearest explanations without a diagram that I have seen on the web about anything , not just sewing..raises hat / glass to Wiz :)

[Sovran81]

Wiz is the man and I know he is right. I just cant wrap my head around the operation like I can other machines that allow you to watch it knot.  

[GPaudler]

On June 17, 2016 at 6:53 AM, Wizcrafts said:

Regarding going bobbinless, the top thread has to pass both over and under the bobbin and shuttle. In standard operation the bobbin case/shuttle holds the entire bobbin load and only exposes the loose thread on top of the case. The top thread is picked off the eye of the needle, then fed around, and over and under the shuttle. This is how it forms a type 301 lockstitch knot. This works fine when there is a bobbin in play, but fails when the thread is fed from under the bobbin, then through and out the top. In effect, the top thread captures the bottom thread twice; on top and bottom of the shuttle. The results is a chain, not a lockstitch.

That is a good description. What if the lower thread fed from beneath the machine, through a hole into the center cylinder of a bobbin, then out of the center cylinder and was wrapped a few times around an otherwise empty bobbin before being picked-up by the top thread? Could that be made to work?

[Wizcrafts]

7 hours ago, GPaudler said:

That is a good description. What if the lower thread fed from beneath the machine, through a hole into the center cylinder of a bobbin, then out of the center cylinder and was wrapped a few times around an otherwise empty bobbin before being picked-up by the top thread? Could that be made to work?

No

[RockyAussie]

Can we just be blunt about this? Sorry NO

[Constabulary]

I think you will have a hard time drilling a hole through the center of the small shaft of the shuttle carrier. And BTW there is a small screw going through the shaft of the shuttle carrier which attaches the driving gear to it. Check out a 29K parts list with exploded drawing (this is from a later model 29K but basically the same around the shuttle). #14 is the one of the tiniest parts in this machine but it kills your idea.

Edited June 19, 2016 by Constabulary

[ndnchf]

Well, I'll just have to see how many stitches per inch I get with the parts I have.  Not sure what that .020" movement at the tip will equate to in stitch length loss.  But if it is excessive, I'll try to weld up the BCL nub and fit it closer.