Speak to me of thread?
I have my table cloth, I have my sewing machines, I have some gutterman 100% polyester sew all. I want to make my hammock with sewn end channels... is the sew all strong enough? I see various things when I search older posts, and most people seem to use a stronger gutterman thread?
I have found standard sewing thread to be more than adequate. YMMV
Guterman is not a strength. Go to DIYGEAR and see that Scott carries 2 (of dozens) of Gutterman's threads, in a total of 4 different thread weights, 2 of the light ones pretty similar.
Lock-stitches are rated at 1.7 x the thread strength. Say the strength of your polyester thread will be 4 - 8 lb, (Tex 35 - Tex 75), you sew channels @ 12 per inch, 2 rows, across a (narrow) 48".
Yes that 1.7 x 4 x 12 x 48 x 2 is a large number, about 10,000.
Even after some degradation from UV, you have a very large operating margin of safety.
I get my 100% polyester thread from Joann's, in the standard thread section, and have yet the have a stitch pop on me. I sew three seams on each end channel, spaced 1/4" apart.
IMO it is not the strength of the thread that gives a seam its strength. That comes from the weave itself. Especially in a folded application like a channel fold. The thread serves to hold the whole mess together. I don't have the physics for it, but that is my observation. I find the whole "heavy thread" conversation to be much ado about nothing. Unless one is doing commercial product production. Then liability might dictate evidence of due diligence. But for your own projects... high quality thread is all you need. And the quality probably matters most in the area of machine performance rather than seam strength
This is why i'm confused and asked. I know that they make a bunch of different stuff from reading the forums, but I can't find a strength rating on any of it. The math does make me feel better since i'm a math geek
Originally Posted by DemostiX
What Rev said.. I have several hammocks who's end channels are sewn with off-the shelf Gutterman's sew-all thread...
To date, my 210+ lb bulk has been well suspended...
Good, feel better.
Originally Posted by bigevilgrape
You can find thread strength with your favorite search engine. Conservatively, I used a lower bound strength and thread from among those DIYGEAR.com offers. Usefully, Scott provides the spool sizes / lengths and thread weights. Your favorite search engine will turn up estimated strengths, also called "tenacity." (Oh, not so easily, I see Chinese mfgs and suppliers are using search optimizers to put themselves at the top of the listings.)
eg. http://www.thethreadexchange.com/miva/merchant.mvc?Screen=CTGY&Store_Code=TTE&Category_C ode=polyester-thread-information
Of course, strengths vary with thread design, so just choose a lower bound for polyester or nylon, ignoring thread-maker. Joann's reports Gutermann "Sew All" is Tex 30 weight.
There are many who don't believe hammock channels are strong enough and who use other methods of grabbing the end. So, it is worthwhile seeing the strength in numbers.....of stitches.
Of course there are wiser people on HF than me, so listen to them first. But my $.02 is this:
I use the all purpose coats & clark polyester, and have not had it do anything bad to me. It goes in easy, and I haven't seen it fray or break on anything I have made so far (stuff sacks, bugnet bottom entry hammocks, winter tarp). All of my stuff has had plenty of stress applied to it and seems to be holding up very well. I don't get too stressed about the thread.
To Speak of Thread
Thread, thy slender countenance
is a wonderous thing.
Wending and weaving,
you make my heart sing.
Together with piercing Needle
we three fabricate,
Joyously, we tend and bind
the heavenly hammock we create.
Tho I speak of Thread,
it is a pale placebo.
For it won't be long
before a-Hammocking I will go.