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

[Ysalex]

So, new to the forum but been lurking for a long time. 

I recently purchased a second hand juju 441 clone, it’s an artisan toro 3200.

After working with it for awhile I noticed it had some timing issues, mainly in reverse, so I started to follow the cowboy 4500 timing adjustment video.

To adjust the “needle to timing position“ I accessed three screws through the upper-rear inspection cover. The first two major screws were tough but came loose. There is a third smaller screw that requires a smaller Allen wrench, it’s listed in the manual on page 12 as figure 6: http://www.artisansew.com/pdf/manuals/TORO_30_32_40_BT_manual.pdf

 

that screw was crazy tight, and my Allen wrench tip broke off deep inside. I could no longer turn it by wrench.

after trying everything I could think of, I made the decision to cut a channel in the screw, then use a flathead inserted into the new channel to turn the screw, and just get a replacement.

unfortunately the screw was tighter than the pressure applied, and both sides of the channel sheared off the screw, leaving the screw flush with the housing.

I cannot get it out now. There isn’t enough head even if I had a welder to weld something to it. 
 

so what are my options from here? Anyone know how difficult it is to remove the shaft that runs horizontally from the hand wheel to the front of the machine? Is it even possible and are they available to purchase?

Anyways, glad to be a part of the forums finally, albeit wish it weren’t for this reason. Thanks to anyone who can offer advice. 

 

[Ysalex]

Tried some t b weld yesterday trying to cold weld a piece of metal to the screw, but it sheared off almost instantly trying to turn it today, so I’m at a loss as to what to do with the machine. Might just be junk at this point, any ideas? 

[Old Coach Saddlery]

Would an easy out screw extractor work, or is it to small?

i have never had a screw that tight. Are you sure it isn’t a reverse thread?

Edited August 2, 2020 by Old Coach Saddlery

[Ysalex]

Not sure why it would be reverse, it’s perpendicular to the prop shaft. If anyone has experience with it though I’d be all ears 

The guy in this video turns it left:

 

[RockyAussie]

How bad is this timing issue?

I presume you are getting some missed stitching happening when you go into reverse?

Or are you getting the needle not going back into the same holes?

 

[Ysalex]

Missed stitches in reverse. The first 2-4 are usually okay but then it starts dropping them. When doing the step for adjusting shuttle/hook timing though I can see that it’s quite a bit off 

[RockyAussie]

14 minutes ago, Ysalex said:

Missed stitches in reverse. The first 2-4 are usually okay but then it starts dropping them. When doing the step for adjusting shuttle/hook timing though I can see that it’s quite a bit off 

That is a shame. I will have to think more about the problem then. I same as you have no idea how to get that screw out without major surgery of some sort. Drilling it out would seem to be the only solution. In the hardware store last week I picked up a set of 3 screw extractors that are like a drill bit that cut in reverse that were fairly cheap but I have not had a chance to try them yet.($6.00 au ...I couldn't resist) A reverse drill bit a little smaller than the thread would be best I think.

[RockyAussie]

Here are a couple of pics of the screw extractors I got last weekend. Big for this job I think but a specialist bolt and nut place should have something along this line that would do the job.

[Handstitched]

This is a silly question,  but you do have the correct needle & thread ? 

If that happened on my machine, 441 clone, I'd be sweating by now ...and a little nervous. 

HS 

[dikman]

The screw is obviously loctited in. Only thing I can think of is to drill a hole in the screw, apply localised heat to the screw using a small pinpoint flame then use a small easyout (or perhaps try gently tapping a small flat blade screwdriver into the hole you drilled?).