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Posted
3 hours ago, Wizcrafts said:

Try to cop a boo at the thread as it goes around the bobbin case and comes up to see if it is snagging on something. Also, check the hook timing to see if it is retarded and too close to the eye. If it is close, advance the timing a bit so the hook is about 1/16 inch above the eye at pickoff time. Also, make sure the hook isn't hitting the needle and that the needle easily clears the hole in the feed dog..

Q: Are you using a leather point or round point needle?

 

8 minutes ago, DonInReno said:

Those are definitely twists in the thread or the thread is untwisting as it forms the knot - not a tension issue.   Sorry to drag you through all the tension stuff - I should have asked for a picture.   
 

What brand and type of thread is it?   To be honest, if I don’t know anything about the bottom problems I’d still think your thread doesn’t look right on top - like it’s not bonded and a loose twist - not the normal dense bonded nylon we usually use.   The good news is, a different spool of thread will probably solve the issue.

I’ve attached a random picture of 138 size thread - look at how twisted your top thread is compared to how it lays down flat in the pic.

B4C8378D-73EF-48EB-97BE-AA3BC6F30024.jpeg

While I guess anything's possible, it sews perfectly on my other machine, and on lighter bag leathers. I'll swap it out with something different first thing.

I think @wiz may be onto something with the timing. I've changed the timing twice since he posted and had worse results, and slightly better results. I'll try again tomorrow as my arthritis is telling me it's time to quit. 

I also receive a new tensioner in the mail today, I'll put the timing back to where it was and try that tomorrow just to rule it out, then go back to the timing...will post back.

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Posted

There are definitely some skipped stitches on the bottom side, so that may be another issue.

it sounds like you’ve had one heck of a day chasing this thing around - you’re really close to getting it, so tomorrow should be a good day

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Posted (edited)
17 hours ago, DonInReno said:

There are definitely some skipped stitches on the bottom side, so that may be another issue.

it sounds like you’ve had one heck of a day chasing this thing around - you’re really close to getting it, so tomorrow should be a good day

Not a better day at all.

Replaced tensioning system, and adjusted

Re-timed hook to factory specs Needle bar 2.4 mm up from bottom .5 mm needle gap, 1-1.5 mm above eye

Best I can do on ONE layer of 2.4 mm veg tan...Knots on top And occasional loops on bottom, and a crappy stitch.

 

Edited by sportycliff
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Posted (edited)

 

IMG_6680 (1).jpg

IMG_6681.JPG

Edited by sportycliff
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Posted

Ok, just noticed this, not sure if it's relevant.

The guy who owned this before me apparently ground the teeth down to almost nothing on the feed dog.

I just noticed it was at and/or below the surface of the plate.

That may explain the crappy stitching, but would it cause the looping? I tried maxing both foot pressures, and it doesn't change anything...

The feet on the machine are smooth, so my guess is that the only thing feeding is the needle. I tried my serrated outside foot from my other machine, maybe a lttle more  consistent stitch(?) Maybe wishful thinking. I've ordered a binding set but it's smooth, and apparently the only style on ebay or amazon. Anyone know where to get a serrated dog for one of these?

Posted
On 1/30/2023 at 11:46 AM, sportycliff said:

My first question, SHOULD this machine be capable of tensioning the thread (138) well enough

If I'm not mistaken this machine has the same capabilities as the PFAFF 335 and similar clone machines. Most of the 335 machines are really only capable of sewing with V92.

 

41 minutes ago, sportycliff said:

I just noticed it was at and/or below the surface of the plate.

This machine was probably setup to sew fabric and aggressive teeth may have been damaging the material.

kgg

 

Juki DNU - 1541S, Juki DU - 1181N, Singer 29K - 71(1949), Chinese Patcher (Tinkers Delight), Warlock TSC-441, Techsew 2750 Pro, Consew DCS-S4 Skiver

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Posted
16 hours ago, sportycliff said:

Any other thoughts?

Now you're sewing on a single piece of leather that might not be thick enough to hide the knot. Another thing I see is how the top stitches have a descent stitch length but are tight on the bottom. How firm is the leather you're using? Does the leather lift at all off the arm when stitching?

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Posted (edited)

I still would assume you need a larger needle or a thinner bottom thread and / or try a heavier beehive spring on the tension unit. If the former owner sewed fabric then the spring may be too weak.

This is from College Sewing in the UK but you will find them on your end as well:

https://www.college-sewing.co.uk/b3114-232-000-beehive-spring-heavy-juki-genuine.html

When you haven lowered the foot on the material do the tension discs feel kinda loose or wiggly?

Edited by Constabulary

~ Keep "OLD CAST IRON" alive - it´s worth it ~

Machines in use: - Singer 111G156 - Singer 307G2 - Singer 29K71 - Singer 212G141 - Singer 45D91 - Singer 132K6 - Singer 108W20 - Singer 51WSV2 - Singer 143W2

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Posted
6 hours ago, Burkhardt said:

Now you're sewing on a single piece of leather that might not be thick enough to hide the knot. Another thing I see is how the top stitches have a descent stitch length but are tight on the bottom. How firm is the leather you're using? Does the leather lift at all off the arm when stitching?

I've got both feet maxed out...doesn't seem to lift at all.

57 minutes ago, Constabulary said:

I still would assume you need a larger needle or a thinner bottom thread and / or try a heavier beehive spring on the tension unit. If the former owner sewed fabric then the spring may be too weak.

This is from College Sewing in the UK but you will find them on your end as well:

https://www.college-sewing.co.uk/b3114-232-000-beehive-spring-heavy-juki-genuine.html

When you haven lowered the foot on the material do the tension discs feel kinda loose or wiggly?

I'm looking into adding a pre-tensioner, I didn't realize heavier duty springs were available too, I'll look for both. Thanks.

 

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