Members the deacon Posted February 12, 2018 Members Report Posted February 12, 2018 I have been trying to dial in my Juki 341 for the past month. I'm not at the point where I'm not sure which variables are effects which outcomes (though I have been trying hard to only change one variable at a time). I can't get the center of my stitch consistently in the middle of the material I'm sewing (example here is two ply #10 canvas duck, size 16 needle, 69 bonded nylon thread. I have used yellow thread in the bobbin to highlight the issue). Seems like every 4th stitch or so the stitch pulls toward the top of the material. I have adjusted the tension and it doesn't eliminate this pull up every so often. Thanks for the help all. Quote
Members DrmCa Posted February 12, 2018 Members Report Posted February 12, 2018 Provided that the machine is threaded correctly, I would suspect a burr on something round which is rotating with the thread. That could be a bobbin, or disks on the tensioner, etc. Did you try a new bobbin? Quote Machines: Mitsubishi DB-130 single needle, Kansai Special RX-9803/UTC coverstitch, Union Special 56300F chainstitch, Pfaff 335-17 cylinder arm walking foot, Bonis Type A fur machine, Huji 43-6 patcher, Singer 99 hand cranked, Juki DDL-553 single needle (for sale)
Members the deacon Posted February 12, 2018 Author Members Report Posted February 12, 2018 good thought. I have tried a new bobbin. I looked at the tension discs, couldn't see any burrs Quote
Members Yetibelle Posted February 12, 2018 Members Report Posted February 12, 2018 When you see the bottom on top - that is typically to much top tension that's pulling the bottom up. Your not far off. That is just 2 layers, does it still do that on 4 layers? Handy chart. Quote One day I hope to learn how to sew..... Singer 111W155 - Singer 29-4 - Singer 78-1 - Singer 7-31 - Singer 109w100 - Singer 46W-SV-16 - Adler 20-19 - Cowboy CB-4500
Techsew Ron Posted February 12, 2018 Report Posted February 12, 2018 4 minutes ago, Yetibelle said: Handy chart. Great chart - I often use the "tug of war" analogy whenever explaining thread tension to someone. Quote Techsew Industrial Sewing Machines Call toll-free: 866-415-8223 Visit www.techsew.com
Members R8R Posted February 12, 2018 Members Report Posted February 12, 2018 I get this sometime with two layers of heavy nylon (1050 ballistic) I start by backing off both tensions then creeping them back up equally till the balanced tension is acceptable. If the tensions on both are too high, little inconsistencies can have big effects like the tension jumping and pulling to one side, etc. I always go for minimal tension to make a good stitch, and minimal feed pressures. Also, sometimes adjusting thread guides (if adjustable) can effect thread take up and fix minor tension tweaks. Quote
Members sheathmaker Posted February 13, 2018 Members Report Posted February 13, 2018 Try an #18 needle and see what happens. My 69 thread likes the 18 much better. Paul Quote Paul long-----108 Briarwood Ln. W-----Kerrville, TX--78028------830 367 5536-- pfl@cebridge.net
Members R8R Posted February 13, 2018 Members Report Posted February 13, 2018 1 hour ago, sheathmaker said: Try an #18 needle and see what happens. My 69 thread likes the 18 much better. Paul Ah! Just noticed after this post it was a 16. yeah I always have WAYY better luck with an 18 and 69. Too much thread bunching and breakage with a 16, especially on coated woven materials. Quote
Moderator Wizcrafts Posted February 13, 2018 Moderator Report Posted February 13, 2018 Keep an eye on the thread as it unwinds from the spool. Follow the thread as it makes its way to the top tensioner disks. Watch for any sign of binding as the thread comes of the spool. Watch out for twisting that forms loops and knots in the top thread. Either of these things will increase the top tension temporarily, causing the knots to move up. Quote Posted IMHO, by Wiz My current crop of sewing machines: Cowboy CB4500, Singer 107w3, Singer 139w109, Singer 168G101, Singer 29k71, Singer 31-15, Singer 111w103, Singer 211G156, Adler 30-7 on power stand, Techsew 2700, Fortuna power skiver and a Pfaff 4 thread 2 needle serger.
Members the deacon Posted February 13, 2018 Author Members Report Posted February 13, 2018 Thanks so much everyone! Great suggestions. I'll try them out and report back. Quote
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