Messed up my machine (juki 441 clone), advice appreciated.

[480volt]

If you can get the shaft out, some machine shops can use a process called EDM to disintegrate the broken Allen wrench and bolt. I don’t know the lower limit on bolt size that this can be done on, and the cost may be more than the part is worth. I’ve had it done a couple times over the years, typically because I broke off an easy out, and there was no alternative. Can’t hurt to get a quote. 

[Ysalex]

Thanks guys!

 

i bought a couple types of extractors unfortunately none of them can get purchase, so all my efforts have come to moot.

 

and while the idea of removing the shaft has crossed my mind, it’s impractical. With the part that is stuck in place, I cannot remove the shaft either direction even if I managed to completely disassemble it. I’d have to cut the shaft off on both sides of the stuck part in order to remove it through the upper rear window, and I don’t have that inclination, time, or mechanical fortitude. 

 

out of curiosity, what do you guys think a machine in this condition is worth? I’m considering washing my hands and buying a new machine. 

 

Edited August 3, 2020 by Ysalex
Adding info

[chrisash]

Would it not be cheaper to return it to a local main dealer to repair or machine mechanic depending whats available in your country, after all a stuck butchered screw in not a uncommon item for sewing mechanics

Every trained mechanic in a decent garage will be expert in removing broken studs from car engines

[Constabulary]

Looks like a set screw. I guess it is hardened. If I were you, I´d try to drill it out entirely with a carbide drill bit and cut a wider thread. Or try a diamond tip tile drill. But that's probably not everyone's cup of tea 

EDIT:

just to give you an idea what a tile drill (or hole saw) can do:

 

Edited August 3, 2020 by Constabulary

[RockyAussie]

11 hours ago, Ysalex said:

When doing the step for adjusting shuttle/hook timing though I can see that it’s quite a bit off

Been thinking .......If the screw is so bloody tight are you absolutely sure that the timing has shifted there and not that the needle bar has been knocked upward????

[CowboyBob]

This is NOT where you time these machines!That adjusts when the hook starts it foward motion in relation to the needle. Look behind the round front plate on the lower rightside,you turn the machine so the needlebar is about an inch into the material & you'll see a 6mm allen in there.THIS is the timing adjustment for the hook.Lower the needlebar down all the way & turn machine handwheel towards you until it rises 5.5mm the the point of the shuttle should be @ the needle & approx a good 1/8" above the top of the eye of the needle.Like Rockyaussie mentioned check to see if the bar got pushed up first b4 you start adjusting the hook! Look @ screw #2 in the attached file.This is the one that is attached to the hook driver & the only way to adjust the timing.So re-tighten your other screws ,your machine should be OK & just use this method for re-timing.

CB441 manual pg8.pdf

Edited August 3, 2020 by CowboyBob

[Handstitched]

21 minutes ago, CowboyBob said:

This is NOT where you time these machines!

O'h dear !!!!!!!!!  Does that mean  all that effort was for nothing?  And he's destroyed the hex screw and tool  for nothing as well ?  Bugger !!! 

HS

[Ysalex]

8 hours ago, CowboyBob said:

This is NOT where you time these machines!That adjusts when the hook starts it foward motion in relation to the needle. Look behind the round front plate on the lower rightside,you turn the machine so the needlebar is about an inch into the material & you'll see a 6mm allen in there.THIS is the timing adjustment for the hook.Lower the needlebar down all the way & turn machine handwheel towards you until it rises 5.5mm the the point of the shuttle should be @ the needle & approx a good 1/8" above the top of the eye of the needle.Like Rockyaussie mentioned check to see if the bar got pushed up first b4 you start adjusting the hook! Look @ screw #2 in the attached file.This is the one that is attached to the hook driver & the only way to adjust the timing.So re-tighten your other screws ,your machine should be OK & just use this method for re-timing.

CB441 manual pg8.pdf

So wait, you’re telling me that the timing/tuning video is incorrect? 
 

I see the diagram at the bottom of your page showing the exact spot I’m adjusting.
 

Shoot...

[Ysalex]

11 hours ago, CowboyBob said:

This is NOT where you time these machines!That adjusts when the hook starts it foward motion in relation to the needle. Look behind the round front plate on the lower rightside,you turn the machine so the needlebar is about an inch into the material & you'll see a 6mm allen in there.THIS is the timing adjustment for the hook.Lower the needlebar down all the way & turn machine handwheel towards you until it rises 5.5mm the the point of the shuttle should be @ the needle & approx a good 1/8" above the top of the eye of the needle.Like Rockyaussie mentioned check to see if the bar got pushed up first b4 you start adjusting the hook! Look @ screw #2 in the attached file.This is the one that is attached to the hook driver & the only way to adjust the timing.So re-tighten your other screws ,your machine should be OK & just use this method for re-timing.

CB441 manual pg8.pdf

So just to double check with you, I did the adjustment you are talking about first, following along with the video. The instruction was to set the handwheel to a particular degree, then adjust the position of the hook so that it is only just peeking out. Then, per the video, I am adjusting that #2 screw. That #2 screw is the screw that broke off.

I feel like im missing something from your post, but I dont know enough about the machine to know what. I was just trying to follow the timing adjustment video when this happened. 

Edited August 3, 2020 by Ysalex
more info

[RockyAussie]

Have you checked how the machine operates after you did the steps in Uwe's video of setting the needle height and adjusting the needle to shuttle relationship up to 4.2 minutes in on the video? This is shown in the manual you linked to on page 11 step 14. The same step Bob has shown. If you have this correct then you should not be getting any missed stitching at this stage. The rest of the steps can be difficult to get right and may not be necessary to do anyway. I have done this whole process following Uwe's video and it can help but as I said generally you should not need to go beyond any steps shown up to getting the timing position of needle to shuttle relationship.