Threading is what makes crackle weave crackle. The number of shuttles and
treadling patterns can vary, but all are threaded with the same basic
elements. That threading is a 3-shaft point twill.
A point twill is when the shafts are threaded 1 - 2 - 3 - 4 - 3 - 2 (repeat).
On a graph, (starting from the bottom right) it looks like this for a four
shaft loom:
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basic unit of a 4-shaft point twill
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When repeated (right to left), the draft looks like a series of points. Point
twill is one of the threadings I used for my
twill gamp dishtowels.
On a four shaft loom, a 3-shaft point twill can be threaded four different
ways.
Any one of them can be repeated as desired. The tricky part comes when
transitioning from one block to the next. For example, from A to B. As you can
see in the above image, Block A ends on shaft 2, and Block B begins on shaft
2. Because crackle is a twill variation, the succession of threads must
alternate odd and even shafts. The solution is to place transition threads
between the blocks.
These transition threads are called "incidentals." You may recall from Crackle Weave: Somewhat of a History, that Harriet Tidball is credited as the first to standardize crackle draft
writing. Her system repeats the first thread of the block as the incidental.
In this example, Block A starts on shaft 1, so the incidental is threaded on
shaft 1.
This follows standard point twill threading and works well when transitioning
from A to B, B to C, C to D, and D to A. Berta Frey (Designing and Drafting for Handweavers, 1958) went on to address incidentals when blocks are skipped, for example C
to A or B to D. In these cases, two incidentals are added to maintain the
twill structure.
Mind you, this is all still head knowledge for me at this point. I don't plan
to do any designing at present, but for now, understanding all of this helps
me make sense of crackle drafts that I look it.
Other threading notes
- Crackle uses a tabby sett.
-
Berta Frey recommends threading the selvedges in a straight 1 - 2 - 3 - 4
twill, repeating as desired.
I don't know if that makes sense to anybody else, but having to write it out
in my own words with my own diagrams has certainly helped me!