Needles And Threads for 7-33

[Silky]

I read through much of the above sticky Needles And Threads

but did not see a direct ref to 7x3 or 7x4 needles specified for the 7-33 machine. How does the 7x 3 needle cross to the more modern designation ? What is the max thread and needle combo a typical 7 class will handle ?

What does the 7 and 3 (or4) represent ?

 

 

[Silky]

Is the Size 7 the Gov't designation ?

And is the "Tkt" the thread size ?

If so, then what is a 7 X 3 and a 7 X 4 ? Surely the 3 and 4 aren't the length ..... are they ?

[Silky]

One more then I gotta go.

This is confusing .... I thought the 230 was 2.3mm and the 26 was the "size".

7x3 is a round needle for fabric ?

794 is a leather "cutting" needle ?

http://www.tippmannindustrial.com/content/Needle-and-Thread-Guide.pdf

Edited October 23, 2019 by Silky
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[Wizcrafts]

The #26 is the old Singer size. The 230 is the metric designation. Some of us think in Singer US sizes while others think in millimeters. The bottom line is that a #26/230 needle is the proper size for #346 thread, top and bottom, and it pokes a really big hole. My largest needles are #27. Some giant harness stitchers and sole stitchers have humongous holes in the throat plate or feed dog that allow for a #30 needle. I once had a needle and awl set for a Union Lockstitch machine that resembled roofing nails, which covered #554 bonded nylon thread.

[Silky]

Organ 23 is what is in it now. The thread was a fuzzy type, I guess typical for book binding.

Later, I'd like to get samples of the various threads and needles to match. Much to do till then though, working on the feeding soon.

Thanks again Wiz,

[councilman24]

In the thread and needle table above the 7  under government is thread designation.  I usually use 5 or 6 cord for parachute harnesses.

All my needles for my 7-33 and now 7-34 aee 7-1 fabric needles. I believe 7-3 and 7-4 were later designations of fabric and leather points respectively. 

Below are a series of photos from various manuals.  First the cover, then applicable pages.

[councilman24]

[councilman24]

[councilman24]

 From Navy Survial Equipmentman manual 3 and 2.

[councilman24]

The Navy Equipmentman manual 3 and 2 is very good for 7 class as well as 31-15, 111 w 150 through 155, 112 w 140, 143 w 2.  But the Cal's manual is by far the best. A user wrote very good detailed instructions for classes 31-15 and similar, 7 class and consew 733, 111 class including consew 225 and juki 562, 211 singer class, consew 199 class, singer 107 class.  Here is an example.  But I have one of only two copies I've ever heard of.

The Technical manual has VERY detailed service instructions also.

 

Edited October 26, 2019 by councilman24

[Silky]

Excellent info !

Thanks very, VERY much.