Would Appreciate Your Advise On Restoring This Singer 45K25

[Frankqv]

Thanks Frank,

The thread has a diameter of .015" (.39 mm). The thread has been breaking with 19 through 23 needles in 8 oz.. With a 24 needle, it sewed fine in 8 oz veg, but broke in 12 oz. With a 26 needle it sewed perfectly in both the 8 oz and 12 oz. What does that tell us?

Thanks Darren,

I will lower the needle bar a touch. What's your thinking there?

Two things

1) Is your bobbin set to tight.The knot is formed with a relationship between the bobbin ,top tension,more tension,more friction (chafing) going through the needle.

2) Is the fiberglass thread lubed. Poly and nylon bonded threads are pre lubed,The bigger the needle,larger hole,less friction when needle is coming up in the material,creating the knot.Remember the takeup lever is coming at at the same time which s actually tensioning the thread going through the needle,which allows the thread to knot as the needle comes up.By going up a needle size you confirmed it's chafing at the needle ,as you added more thickness you increased the friction,so you went up one more needle size,bigger hole less friction.

A little lube will go a long way in this instance.

Maybe this will help

http://www.wflake.com/thread/E-glass%20R783-Series.pdf

http://www.claremontcorporation.com/claretex-sewing-thread-fiberglass-yarns/

I went to titanium needles on my singer 153 and was able to sew all thread sizes withe a 1-2 size smaller needle. The nitrided Titanium is about 2 times slicker than chrome steel. Maybe?This shows advantages of titanium

http://www.superiorthreads.com/education/infographics/superior-needle/

Edited April 19, 2015 by Frankqv

[Evo160K]

Frank, Darren, Sark9,

Thank you for your thoughts. Being new to these fascinating old machines, I particularly appreciate every word you write.

Coincidently, Frank, the fiberglass thread I'm dealing with is from the w. f. lake company....excellent products. It's their R-753-24 that I'm using, and it does have a PTFE coating, it's supposed to reduce friction. Isn't PTFE the same as "Teflon." I can't envision using this thread any more, particularly in leather, but out of interest and curiosity want to understand what's making it break. The bonded poly and bonded nylon work fine.

When the wife returns with her iphone in a few days from visiting the grandkids, I'll shoot a video showing the machine, the loop and how the thread is breaking. It's an interesting puzzle!

With the bobbin tension, since it sews perfectly without material, would it change with material? I've contacted Superior threads about their titanium coated needles, thanks for the link, Frank. If they have system 328 needles, I'm going to buy a package. They say they're only $ .20 more than a regular needle.

SARK9, having a dedicated machine for a thread would be nice. I understand you professionals do that. Back when we were sewing safety clothing with fiberglass and Kevlar thread, we could justify only the one machine, the Claes 8345. As a side bar, our company was the first in the country to sew with Kevlar thread. Many years ago when we saw the Kevlar fabric in DuPont's booth at a trade show, we asked DuPont for some of the Kevlar thread and immediately passed it on to the Hy-Test safety shoe division of International Shoe Co to be tested in the Potroom and Ingot boots (read: molten metal) they were making for us for Aluminum Company of America, (Alcoa). The Kevlar thread turned out to be a huge success because of its high temperature and strength properties. It is hard on sewing machines however.

Thank you one and all.

Edited April 19, 2015 by Evo160K

[jimi]

Hi Al, could it be the twist on the thread??

[Evo160K]

Hi Jimi,

That's an excellent question, although somewhat above my pay grade. The spec sheet for the thread identifies it as a "Z" twist (Right Hand twist).

You no doubt know about twist. I looked it up on the Juki website, http://www.juki.com.sg/Libary/Knowledge_of_The_Sewing_Thread.pdf , and found:

Twist direction - Direction of twist is identified as S for left twist and Z for right twist. Most single needle lock stitch and other machines are designed for Z twist threads. S twist thread untwists during stitch formation.

Direction of twist does not affect the strength of the thread, but it can seriously impair its performance when it is used on a machine for which it is not suited.

Jimi, it's interesting the 45K manual you posted says best results are obtained by using LH twist in the needle and RH in the shuttle. That was probably written before poly and nylon thread were introduced.

What's your thinking on the matter?

Thanks Jimi.

Best regards,

Edited April 21, 2015 by Evo160K

[jimi]

Hi Al, Well i had a similar issue when i changed the nylon bonded from the spool to a wooden bobbin, i must have wound it on wrong so when it reached to the needle it was twisting too much and then breaking after the needle went down on it. otherwise you got the needle in back to front haha! but if it sews well on all other kinds of thread then great! i`ll bet in the end it is something reeeeal simple haha!. all the best jimi.

[Evo160K]

Hi Jimi,

Thank you for your thoughts. The wife is due back today. I'll do the video, hopefully it will show you professionals what's causing the breakage. I'm really curious about it.

Best regards

Edited April 22, 2015 by Evo160K

[Evo160K]

Hello Good People,

Here are some videos of the top thread break puzzle. Two videos showing the machine sewing perfectly with out material under foot and two showing it breaking the top thread with leather under foot.

Well, every time I try to post a video, I get a message saying the video is too large. I cut the size in half with Windows Movie Maker, then got the message I couldn't post that type of file.

Does any know how to reduce the size of videos taken with an Apple iphone? The maximum single file size is 1.46MB

Thank you.

[hyttogpine]

Hello Good People,Here are some videos of the top thread break puzzle. Two videos showing the machine sewing perfectly with out material under foot and two showing it breaking the top thread with leather under foot.Well, every time I try to post a video, I get a message saying the video is too large. I cut the size in half with Windows Movie Maker, then got the message I couldn't post that type of file.Does any know how to reduce the size of videos taken with an Apple iphone? The maximum single file size is 1.46MBThank you.

Hallo Evo166K

Dropbox is very good to many things, among a solution to your aktuell problems.

Open a Dropbox account - you gets 2 or 5 GB for free - upload easily from any computer, phone or tablets anything, no matter how many MB the (video) file is > place in the "public" folder > copy the URLadress > live it in any post you like or at any site you want > since the URL is a an embedded adress, everybody can opened in any Webbrowser.

And if you suddenly find yourself in Kolombo or North Pole with only your mobilphone and need some important document you just download it too your device.

If you open a account, be aware you can let Dropbox scan your device for all kinds of pictures, text files, video files and it will automatically reach the sky. Or you kan select manual witch files and folder you want on Dropbox server.

Edith: If you upload a video file to Dropbox and poste rhe URL anywhere, those who are interested to watch the video, don't need to download the video, it's can be streamed directly.

Edited May 7, 2015 by hyttogpine

[Evo160K]

Hei Hyttogpine,

Takk for svaret ditt. Vil Dropbox tillate meg å redusere en 3MB iPhone video ned til ca 1.46MB?

Hello Hyttogpine,

Thank you for your reply. Will Dropbox allow me to reduce a 3MB iPhone video down to about 1.46MB?

[hyttogpine]

The answer is no.

Dropbox is a storehouse. Not a factory who adapt or convert anything.

You get the master key for this part of the storehouse you administer. Thats it. If you want have two or three huge wooden boxes to keep your goods in, or 73 cardboard boxes. You have the right to lend out a secondary key, to any perso you like, for any particular boxes you like them to look into.

Before you get lost. The different boxes are a counterparts to folders.

Why would you compress the 3MB video file to 1.46MB ? Let the world se you artistic skills as a filmmaker, in a better quality than 1.46MB. Ok, I guess your problems. Probably they are the same character as min. I guess both of us need a URL adress where the the video (picture?) are stored ?

Hopefully, there's someone clever than me, dropping by. Explain if this site have enough space to store it self.

An advantage by Dropbox. You have a lovely melody would like to send to your grandmother, here and now. But unfortunately most delivers of email refuse to send emails bigger than ? MB. You will get your email in return and your grandmother i Australia will weep. Therefore upload your melody to Dropbox, then send the URL adress to Australia . . . . vola, grandmother now be rocking to your melodi. She can even download it.

By the way, if you, now or later need to convert or scale up/down there is good small software program called Format Factory, and it's for free. It's pretty nice to anything about pictures, sounds, Videos, joining/splitting, ripping disk etc.

Du er lokaliset i Indiana, men skriver på norsk ? Så god er ikke Google oversetter ! Forklar, forklar, but send it as PM.