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Top Thread Tension issues

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steelguitars View Drop Down
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    Posted: 12 September 2018 at 9:57pm
Good evening all, 
I have a Thompson PW-500 (sailrite accessories pictured) and after changing my thread spool I have been dealing with some really strange issues. I'm using v69 thread, that appears to be kinda noodly. What seems to be happening is after some time I hear a click and the top thread loses all tension. The discs and springs seem fine, but after the click the thread rolls around the first hole (left most) on the thread guide. Thanks.
Additional Info:
This problem persists with needles sizes 16,18,20
The black thread is the top thread and the bottom is the teal colored thread. 
I have rethreaded the bobbin several times, checked the lower mechanism for burrs and cleaned out the lint so I feel as though I've eliminated the possibility of anything from the bottom,  could this be caused by the core of the thread popping and causing the thread casing to cool and not catch with the bottom thread?he thead wraps around the guide as shown below. 


Edited by steelguitars - 12 September 2018 at 10:09pm
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MattGrant View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MattGrant Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2018 at 8:09am
If this is the underside of the fabric then you are likely correct that the upper tension is failing. Are you suggesting that you can sew along for a long while before this happens? What do you do to clear the issue and start again for the same thing to happen?

You could try a double wrap on the tension assembly (go around one more time before catching the take up spring) to see if that keeps the thread from "springing" out of the discs. If you try this you will need to reduce upper tension quite a bit. If this works then it could be the quality of the thread that is the issue.
Best Regards,
Matt Grant
Sailrite
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steelguitars View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steelguitars Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2018 at 4:28pm
Thanks, Matt!

Like clockwork I get a couple of linear feet of sewing before I hear the click and then the thread looks like what the pictures show. As far as what I do when this happens, I cut the thread  between the spool and the machine, remove the old thread and re-thread the machine. The problem began after changing from a nice thread to some cheaper thread that came from Amazon.
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MattGrant View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MattGrant Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2018 at 5:15pm
Before you go too far with adjustments I would get some quality thread from Sailrite and test again. 
Best Regards,
Matt Grant
Sailrite
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