Gymnast

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About Gymnast

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    Member

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  • Gender
    Male
  • Location
    Denmark
  • Interests
    Applications for gymnastics. Repair of tarpaulin covers and with webbing. Rubber rope and terminations.

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  • Interested in learning about
    Sewing machines and ways to use them
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  1. Gymnast

    Thread tension and twisting

    Yes. I have asked this question to SLC in one of their youtube videos, they allow to comment on. It seems that they do respond normally there. Furthermore I placed a link to here. So hopefully they will answer. But from you we know, that American & Efiro (or should it be Efird?) seems to produce thread with the counter clockwise unspooling http://www.amefird.com/
  2. Gymnast

    Thread tension and twisting

    Right, with your redesign of the thread stand by rolling off the thread, it should make no change, because I think the bonded thread will be in a "relaxed" state when stored on the spool. So some twisting will be introduced by the thread comming off the end of the spool, which is the normal case for leatherworkers. For my little machine, I am sure, that I had to make the threading different in the two cases according to this spooling direction. I watched two other videos on threading of Cowboy machines from SLC, and they show spools with thread comming off clockwise.
  3. Gymnast

    Thread tension and twisting

    I just got a little update on this subject. I noticed a video from Rusty, Springfield Leather Company, with a thread leaving the spool anticlockwise when you look down on it. Most spools I have seen is the other way around. If you have read the information in this "thread", you will notice, that a thread comming off this way around should be easier to handle. The video is this:
  4. Gymnast

    Tension problems

    And I have to ask - no offense - did you remember to lower the presser foot? I got your Picture in my head from forgetting that.
  5. Gymnast

    Tension problems

    Often when you put in smaller thread in bobbin, you need to adjust the lower tension, because it will be too low. Did you do that?
  6. Gymnast

    Needles And Threads

    I have based the needle size on the thread and fabric i use. I normally store all relevant sizes of needles with regular point. A starting point for me is the guide from the thread manufacturer - and in my case Amann: https://www.amann.com/products/ They have a recommended needle size for all their threads. I have noticed, that for the same tex value or number involved for nylon and polyester, then Amann recommends a larger needle for nylon. Polyester have a higher density than nylon, and therefore nylon will have a bigger effective size for the same weight. This could be one explanation. I start with a needle size recommended. Then I may try to reduce the needle size until it do not work for the fabric and thickness involved.
  7. Thanks Kgg, for this information. Interesting way to fight these twisting problems. I think the resin used for bonding of the thread will relax (creep) in the weeks or more the thread is stored on their way from manufacturer. Perhaps most sewing thread is like that. As described in the "other thread" I noticed that to be true for the Serafil thread on my spools. However in the short time the thread is off the spool, it will fight any change in the twisting like a spring. This "fighting" is like how strong this internal "spring" is in the thread and I think this "spring" is stronger with the black nylon thread as also Wiz has commented on. When you avoid the thread comming off the end, no twisting is introduced by that from the spool. However, you may still have twisting comming from the machine. The newer models of domestic sewing machines do also have the thread comming off the end of small spools. I have seen arguments, that the step pull to the "heavy" spool causing some peak tension, that you want to avoid. What do you think about that for your application?
  8. Gymnast

    Thread tension and twisting

    Yes, perhaps. The Techsew video is an official Techsew instruction. I noticed this Juki 1508 manual with the clockwise turn on the first steelplate. http://www.juki.co.jp/industrial_j/download_j/manual_j/lu1500n/menu/lu1508/pdf/instruction_7k_1508.pdf#page=1 I know that deviating from manufacturers threading instruction can have some issues. However it may be a way forward when your thread is kinking.
  9. Gymnast

    Thread tension and twisting

    I made one more video in three parts of how a thread comes off the spool in three situations. 1) One thread guide and pretensioner. Result: kinks 2) One thread guide, 4 turns clockwise around something and pretensioner. Result: kinks 3) One thread guide, 4 turns counterclockwise around something and pretensioner. Result: OK and nice Perhaps a few readers did not notice the implications from the first video therefore this video. I think the thread comes off the spool over the top end clockwise in most cases. If the thread comes off counterclockwise, then this problem might not be that severe. I noticed, that more youtube videos and manuals on how to thread an industrial sewing machine actually make the thread go clockwise around something in the start. I do not think this is wise, if you have got thread like this serafil 20 or perhaps more difficult thread. This is an example of such a video for a Techsew 2700 (see from 1:20): I think it should be easy to make the thread turn counterclockwise the two first places on Techsew 2700. Here is another video on a Pfaff 545. In this video the thread turns counterclockwise in the start - so it is how I like it
  10. Gymnast

    Thread tension and twisting

    For the test of these two spools, the perimeter om the spools were 0.163 m and 0.160 m. The 6 turns each meter fits an asumption, that the thread do not have internal moments (twisting) when stored on the spool. The twisting is added by taking the thread off the end.
  11. Gymnast

    Thread tension and twisting

    I saw this special thread stand from Australia. It has like an antenna on it: The video also tells you about metallic thread to be a challenge. The video do not have HD quality, but I think that the thread comes off the spool clockwise (i have seen examples of the opposite). Then the tread actually go around this antenna anticlockwise, when it moves forward. This should be good. I think, that this going anticlockwise around something also can be done a Little further away from the thread stand, and in a way that ads more tension. I tried a DIY version of this thread guide:
  12. Gymnast

    Thread tension and twisting

    Sorry - I may not have been accurate here. 1:40 into the video I reveal the thread to be a tex 140 polyester thread. It is infact a tex 135. It is a Serafil 20 from Amann. And I think you got it in your second reply "size 20 thread". There might be a guide to the position of the thread guide over the spool. But in my experience it do not matter that much. It matters much more how the machine makes twisting back to the spool. Yes - the possibility is there with a row of guide holes. You can go clockwise around or anticlockwise. I did however Watch some manuals and videos for the use of them, at they may adwise only clockwise around, and this may be wrong in most cases. I noticed that for the Juki LU 1508. I have to asume, that the tread comes off the spool clockwise. Then the Z-twisting will be stronger after it comes off and off the small diameter of spool. In my video i show how ordinary thread guides and tensioners will make this twisting near the spool even worse. It will also make the Z-twisting stronger near the spool. The only way to make relief for that is to bring the thread anticlockwise around something on its way. It could be a piece of metal with a row of 4 holes. Or a steel thread parallel to the thread for some distance. That is my adwise here.
  13. Gymnast

    Thread tension and twisting

    Do you always see the thread comming off the spool clockwise, when you look Down on it? They do on my spools.
  14. Gymnast

    Thread tension and twisting

    Thanks for your reply, Mikesc. I am not quite sure how you mean here. Do you drill a Ø1 mm hole in the block? Is it a solid block or is it foam based polystyrene? Foam based can be extruded (XPS) or expanded (EPS). Expanded foam is most used and cheapest - I guess that is what you mean.
  15. Gymnast

    Thread tension and twisting

    Thanks for your response, Constabulary. I am aware, that I use my sewing machines to jobs, they were not designed for. The machines may be destoyed by it. And it causes some problems for me. I describe the problems and how I try solve them, and perhaps somebody can use this information. I think that is what a forum is about. For some it will make sense for others not. I think problems with thread twisting is a popular subject in this forum. When you have got the good machine for the job, it may solve most of the problems for you without too much knowledge from the user. However I think, that a leatherworker sometimes will do a job on the limit for what his sewing machine can handle.