How to choose the correct reed for your sett., part of a 10 Step series of articles on warping your loom
Once you have chosen your yarns, you will also need to determine the sett of your cloth, or how many threads per inch the fabric will be. If your pattern does not give you this information, or you are using an alternate yarn or are creating your own design, wrap the yarn around a ruler, so that each wrap of the yarn is just touching. Wrap the yarn over a space of 1 inch. Then count the number of wraps. This will give you an approximate sett.
Determining the correct sett for your project can be a bit of a challenge. If the same yarn is used in both warp and weft, the following formula should result in a balanced weave structure.
W = Wrap the yarn around a ruler, with the yarn just touching, to determine the number of wraps per inch.
I = Study the weave structure of the pattern you wish to use, and determine the number of intersections in the pattern repeat. Each time the weft travels from the front to the back of the fabric, passing between warp threads, this is counted as an intersection.