Draft conversion to Blocks
So here goes, I will try explain how I go about converting an overshot draft to blocks and hope it makes sense and that I haven’t forgotten some vital step in the process.
This overshot draft has the first three blocks circled. Overshot blocks overlap, the last and first ends of each block.
Block D – shafts 1 & 4 – twice (red)
Block A – shafts 1 & 2 – once (blue)
Block B is next on shafts 2 & 3
Block C on shafts 3 & 4 and so on
Once I have figured out the block sequence, I can write it like this – a profile draft where each square represents a “block” of multiple ends
Now that I have a profile draft I can substitute each block (represented by one black square) to a threading, in this case a twill where every block will be substituted with 3 ends – that makes the draft 3 times larger. This profile of 16 blocks will become 48 ends.
Block D x 2 threaded as 10, 11, 12 (I am using a 3-end twill so that on 16 shafts I can thread the edges as a fifth block for a border)
Block A x1, threaded 1,2,3,
Block B x 1, threaded 4,5,6,
Block C x 2, threaded 7,8,9
Block D will be 13,14,15
When I substitute each square of my profile draft with the threading ( here I have added the fifth block on shafts 13,14,15 at each side for my border ) this is the draft.
Then I add my tie-up and treadling to come up with
Using blocks instead of a full threading allows one to experiment with arrangements of threading and treadling more easily and see the overall pattern without the distraction of all the individual ends. Of course a computer program for weave drafting is a huge help and time saver, but it helps to know the theory behind the moves. I have used Fiberworks PCW almost as soon as it was out. For me it was the most logical of the weave software available and the easiest to learn. I also have ProWeave, it has features I like for other applications and especially for damask weaving.