The fleece I am working with is not brilliant, but I am using it to practise making a balanced, soft spun woollen yarn for knitting. To do this I read up on Mabel Ross’ method, and with a little tweaking to suit my preferred yarn handle, it worked!

Mabel Ross worked it out for us and it is quite logical really. You do need to know your wheel’s ratios, work consistently with your draft and count your treadling to start with, so if thats not your style, don’t go there.

I was aiming for around 2tpi in the finished yarn, but actually increased this a little after the first samples.

The equation is to do with spinning the singles at the tpi you want and then plying them to get the final tpi you want. Its really helpful to remember that if you spin your singles Z, when you ply them S you will be unwinding some of the single’s twist. (update- I have subsequently spun some yarn at a much higher tpi using a 1:10 whorl that has come out soft after a similarly balancing plying method. Maybe I’m getting it…)

I worked backwards from my 2tpi goal.

For example: I was working with a 1:6 whorl, therefore one revolution of my wheel would turn the bobbin 6 times. I was spinning ‘Z’ twist with a long draw of 12″.

First of all I needed to know how many treadles to the 12″ draft would give me the tpi I required. Yes I know I’ve muddled metric and imperial, but it still works.

Number of treadles = (required tpi x planned draft length)/ divided by wheel ratio (which i know will be 6)

tpi of my singles = tpi of my plied yarn divided by number of plies

II reckoned that if I want 2tpi in the plied yarn, I needed to spin the singles at around 4tpi.

The equation I worked with using MR method to find out how many treadles I needed to a set draft length was:

tpi = (wheel ratio x treadles)/divided by draft length.

Go back to the earlier question of how many treadles?

Number of treadles = (required tpi x planned draft length)/ divided by wheel ratio (which i know will be 6)

which came out as

tpi (4) x draft (12″) = 48/6 = 8.

So 8 treadles using the 1:6 whorl to a 12′ draft should give me 4tpi. in my singles…

Well I wrote this post a while ago, and since then have done some spinning. It was not successful, way to soft and loose spun for my taste, but a balanced yarn – no twisting and it knits without bias.

I upped singles tpi a little and also the ply by a smaller amount and the yarn improved. and stayed balanced! A lesson learned.