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pgf

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Reply with quote  #1 
So my 1873-ish Gold Medal "Home" has a shuttle that's different than both the New Home shuttle that followed, and the Gold Medal "Home Shuttle" shuttle that it coexisted with.  And, if I'm doing it right, it's tricky to thread.  I'm pretty confident that this threading is correct -- both because the thread path matches the existing wear marks on the shuttle, and because it makes sense once you've finished.  But if I'm right, I'm not surprised it was a short-lived design.

(If it looks familiar, and someone knows of another machine this was used on, please say so!  Likewise if you know of a different threading route.)

My browser won't let me intersperse images nicely, so these comments refer to the attached images, in order:
  1. Start with the thread coming off the top, as usual.
  2. Feed it out through the middle hole on the side.
  3. Feed it back in through that same hole, but not all the way:  "turn the corner" so it exits up between the shuttle wall and the internal leaf spring.
  4. Pull the thread through so that now it's simply unwinding from the bobbin and going up behind the leaf spring.
  5. Pull the thread forward so that it exits at the front end of the leaf spring, where it is now adjacent to the forward hole on the shuttle's side.
  6. Send the thread out that hole.
  7. This is the finished view from the outside.

Attached Images
jpeg home_shuttle_1.jpg (166.88 KB, 7 views)
jpeg home_shuttle_2.jpg (179.86 KB, 8 views)
jpeg home_shuttle_3.jpg (198.45 KB, 9 views)
jpeg home_shuttle_4.jpg (177.58 KB, 9 views)
jpeg home_shuttle_5.jpg (160.71 KB, 8 views)
jpeg home_shuttle_6.jpg (182.10 KB, 8 views)
jpeg home_shuttle_7.jpg (144.85 KB, 8 views)


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SteveH-VSS

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Reply with quote  #2 
NICE!!!

How would one go about changing the "setting" to increase or decrease lower tension?

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pgf

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Reply with quote  #3 
Ah -- good question.

There's a longish grub screw running across the rear end of the shuttle. The screw head is recessed into the small hole you can see at the near corner of the shuttle in pictures 4, 5, and 6. (You can also just see where the tapped threads for that screw are just a little too close to the surface of the shuttle, adjacent to that hole.) You can clearly see the plunger that the screw acts on in contact with the leaf spring in pictures 1 and 2.

As you might guess from the geometry, there's not a lot of adjustment range -- a tiny movement of the plunger changes the pressure at the far end of the leaf spring by a lot. There's either tension, or there isn't. Perhaps when new, and the spring had more bow to it, it worked better.


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SteveH-VSS

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Reply with quote  #4 

The Davis Handcrank has a similar screw but at the front.  It actually applies tension to the arm underneath!


20190717_204753.jpg 


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pgf

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Reply with quote  #5 
And what does the curved end of that arm (the near end) press against?  It almost looks like it would press against the thread wound on the bobbin, but that can't be right.
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SteveH-VSS

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Reply with quote  #6 
yes, yes it does.
20190717_203456.jpg 


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pgf

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Reply with quote  #7 
Quote:
Originally Posted by SteveH-VSS
yes, yes it does.


But...  but...   that's crazy talk!

Sure seems like the tension would change as your bobbin thread got used up.

Maybe there's a reason we don't see that design anymore, either?  :-)

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