Lots of weaving structures involve tabby, not just overshot and crackle. That doesn't make them the same. What makes a weave structure a structure is how the blocks are set up with threading and treadling. Often, there is a very common pattern in those, no matter which specific draft you are using. For example, if you weave huck lace you KNOW you will need most of your heddles on shaft 1 because virtually every other end is on shaft 1.
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Theres a good book on crackle: Some monographs explaining the technique: And a good blog post:. A block has nothing to do with a certain number of threads. That will change depending on the weave structure. Imagine a checkerboard, or a geometric design on the floor with black and white tiles.
That's basically a block pattern. If you hear someone say profile draft, it will look just like that. To get your weaving draft, you substitute each 'square' in your profile with the appropriate threading/treadling for your weave structure. For twill blocks, Block 'A' might be shafts 1-4, and Block 'B' might be shafts 5-8. So a two block profile draft will need 8 shafts if you wanted to use twill blocks, but might need 10 if you were doing satin blocks but only 4 if you were using crackle.
There's an introduction to block weaves here:. This is so frustrating. It's like I understand what all of the individual words mean, but combined, they are a jumble. So a two block profile draft will need 8 shafts if you wanted to use twill blocks, but might need 10 if you were doing satin blocks but only 4 if you were using crackle.
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Ignoring satin because I'm not interested in it, can you point me to where I might find an explanation on what the fundamental differences between twill and crackle are that crackle requires fewer shafts? Also, I thought crackle was always woven with a tabby weft and a pattern weft, but some of what I've read today says it varies by pattern and there are many crackle patterns that say tromp as writ. That being the case, how does crackle differ from oddly threaded and treadled twill, given that point twills don't always have the 2x2 alternating effect (I just did one with carries up to 4 threads)? Both use contrasting warp and weft threads to create a patterned fabric.
And how does crackle with tabby differ from oddly threaded and treadled overshot? Both use a warp with one weft to create a ground and another weft to create a patten. This is the part I'm not getting. It's the difference only in the arrangement of the blocks? If so, what is the motive in calling it something different? Twill is characterized by floats in both warp and weft that offset.
It doesn't have to be 2x2 - the float length can be vary, especially in multi-shaft. But twill is just a one warp, one weft weave. Crackle is actually a 'supplementary weft weave'. You need two wefts to do it, on two different shuttles.
If you only use one weft, it doesn't look like crackle. This person did a bunch of samples of crackle and one of them she skipped the second shuttle. See how different it looks (in sample 4): Overshot is also a supplementary weft weave. The difference between overshot and crackle is how the blocks work.
The HGA has a webpage where they list the basic types of weave structures: If you want to know more about how weave structures work (and this is an area you can study and play in for years) I recommend this book:. I think it's starting to make sense. Am I right in my understanding that they're are multiple components to a weave structure, and that in some cases such as the crackle as twill, it borrows from more than one category? I like things like which I'd weave as twill. That's the source of my problem; I don't understand why that isn't twill. Just an oddly patterned fancy twill.
I can't thank you enough for putting up with my beginner questions. One weaving school in my area is closing (the Mannings) and another will open in its place in 2016, so while I know I really need to get some classroom time in, I'm on my own during this transition time. The draft you posted is an advancing twill. Twill weaves usually have a straight threading - 1,2,3,4,5,6,7,8, repeat (for straight twill) or reverse (for point twill). This threading advances for a bit, then retreats, then advances again. Then it reverses. The treadling is a point twill treadling.
The advance/retreat is where the term 'advancing twill' comes from. These examples show just a straight advancing threading and treadling, and what happens when you have reversing in one, but not the other, or reversing in both. Looking at advancing twill drafts was how I originally stumbled across the term crackle. I took that draft from discussion, where it looks like it came directly out of a book about.
I feel less bad about being so totally confused now. It looks like there is a fair amount of overlap in these techniques. I feel like if I had to take a test where I was shown pictures of various weavings and I had to guess whether or not it should be considered crackle, I'd fail with a 0%. Generally a pattern will call for using tabby to keep the structure of the weave intact when there are big floats involved, especially with many repeated picks on the same treadle. Overshot and crackle weave have a very different appearance - overshot tends to be large blocks of color, whereas crackle has a sort of crackly texture. If you're trying either if these weave structures out my best hot tips would be to remember that you want your pattern weft to be much fatter than your tabby weft (2-3x) so that it will cover the tabby and fill in the pattern nicely, and to use a wider sett than you think you'll need. Very loose tabby sett, you'll be packing two sets of weft in over one warp.