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Profilen skipped stitches with LSZ-1

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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: 26 June 2017 at 6:27pm
Good thing to try but a #16 needle is still likely going to make the biggest improvement.

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Matt Grant
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SV/Mehitabel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SV/Mehitabel Quote  Post ReplyReply Direct Link To This Post Posted: 30 July 2017 at 10:41am
I have a new LSZ-1.  I an having excellent results, no skipped stitches, with Profilen.  The thread is being fed the usual way, vertically off the spool, then through all three holes in the pretension bar.  I am using a #16 Serv 7 needle, and I am sewing Sunbrella fabric.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MattGrant Quote  Post ReplyReply Direct Link To This Post Posted: 30 July 2017 at 10:54am
We do love Profilen thread! I am in the midwest and I use it for all of my sewing, even though outdoor polyester thread would last upwards of 8 years. It just gives me piece of mind to know that the thread won't fail. Today's performance outdoor fabrics last so long that it really only makes sense to use a lifetime thread now.

Thanks for your comments,
Matt Grant
Sailrite
 
Best Regards,
Matt Grant
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LauraM Quote  Post ReplyReply Direct Link To This Post Posted: 31 July 2017 at 10:10am
Have continued sewing Sunbrella, now using Tenara thread and #16 needle, and continue to have some skipping, even using all 3 pretension holes and a double wrap around the bobbin winding tensioner.  I've gotten some improvement with shortening my stitch length, but it's still not perfect.  Next I'm going to see if mounting it horizontally will work better.  BTW, I saw a very slight improvement using the Tenara vs. the Profilen, and it almost never skips in reverse.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote GlennC Quote  Post ReplyReply Direct Link To This Post Posted: 03 March 2018 at 2:15pm
After about 7 months of using my new LSZ-1 to do several major boat projects using polyester thread I decided to try sewing with Profilen thread I ordered from Sailrite for a hatch cover I was making.  It did not go very well with the machine skipping stitches every 9th stitch or so and forget about zig zag.  I knew this could happen when I ordered the thread but wanted to use a liftetime thread for certain projects and figured I could dial it in.  I tried all of the tips and tricks mentioned here and online, even verified the machine was timed correctly all of which only resulted in minimal improvement, so I won't go into those here.  Fabric was two to three layers of Sunbrella.
I was doing some research online and came across a sailmakers website with information about skipping stitches when using PTFE threads.  There they recommended using a special Groz-Beckert needle if you are unable to sew PTFE thread properly after using other needles in your machine.  I ordered three different sizes to try from a specialty thread and needle company.  I made no special adjustments, threading changes or changed anything else to the machine.  I set the machine up as if I was sewing with polyester thread with a 5mm stitch.  BINGO!  No skipped stitches either straight or zig zag.  Too good to be true so I tried using the old #16 & #18 Sharp and the Serv 7 again.  Skipping came back immediately with each type.  I put the GB needle back in and no skipped stitches.  They are shaped very differently than any Schmetz needle in my arsenal with a hump on the long groove side of the needle.  I'll still use my Schmetz needles from Sailrite with polyester thread as they have performed flawlessly to date.  Finished my hatch cover and it turned out great.
Groz-Beckert 135X17 - Size 110/18-R Point- a.k.a. 3355 MR, DPx1 MR 4.0  (works best in my LSZ-1 when using Profilen thread)
Also comes in size #16 MR 3.5 & #19 MR 4.5   
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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: 05 March 2018 at 4:53pm
Hi Glenn,
We have had great luck with the Profilen and the Schmetz needles but it sounds like Groz-Beckert could even be better. I am getting some of those needles right away to test myself. If they work well, we will add them. Thanks for the feedback!
Best Regards, Matt Grant
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Best Regards,
Matt Grant
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Post Options Post Options   Thanks (0) Thanks(0)   Quote patja Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2018 at 10:48pm
Thank you GlennC for sharing your discovery.

I had been putting off restitching my mainsail cover because I was dreading dealing with the Profilien skipping issues.  Then I received a notification of your post.  Today I popped into my local industrial sewing machine shop to pick up some Groz-Beckert needles.  Coincidentally they had an older Sailrite Ultrafeed "ZigZag" machine sitting at the front desk for a customer to pick up.

Anyways, I just finished my first couple of rows of stitches on the cover with the new needles, and it is all flawless.  With just the normal/default threading, no double loops or other gymnastics.

Thank you again for sharing this.
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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: 07 March 2018 at 11:13pm
We have needles on the way to test as well. So I hope to be able to report my findings soon as well. Thanks to both of you for the testing you have done!
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Matt Grant
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tejas Quote  Post ReplyReply Direct Link To This Post Posted: 08 March 2018 at 10:20am
GlennC, I wonder if the GB needles have a longer scarf than the Schmetz needles. PTFE thread is slick, and a longer scarf might mitigate failure of the hook to catch the loop.

I've not had a problem with skipped stitches with PTFE thread. However, long ago a canvas shop recommended that I use Singer MR4 needles, and that is what I've always used. I think that the scarf is longer than Schmetz needles.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote GlennC Quote  Post ReplyReply Direct Link To This Post Posted: 08 March 2018 at 11:36am
Tejas

You may be correct about the length of the scarf being a little longer.  The big difference I see in the GB MR 4.0 needles is in the area of the scarf.  The whole length of the scarf area bumps out on the opposite side where the long groove of the needle is thus causing a hump on that side of the needle which is as long as the scarf itself.  As a reference point the long groove side of the needle would be on the left side of the needle when in the LSZ-1 machine.  
I have not seen this before and none of the Schmetz 135x17 needles I use for sewing have this feature.  Maybe this hump helps trap the thread when the needle is coming up to better form the loop since PTFE threads are so slippery as you mentioned.

Does you Singer MR4 needles have that feature on the long groove side?

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