I am making a gypsy skirt muslin as described in the June/July ’06 issue of Threads. The first tier is 40″, second 60″, third 80″, and fourth 100″. I’m gathering on my serger without a gathering foot.
I assumed that dividing the longer layer by the shorter would give me the differential setting. That meant:
gather 3rd and 4th: 100/80 = 1.25
gather 2nd and 3rd: 80/60 = 1.3
gather 1st and 2nd: 60/40 = 1.5
But it turned out those settings didn’t gather nearly enough to match the shorter layer I was attaching it to. Is the differential setting a thumb in the wind kind of thing, or can you really derive it from some calculation between 2 fabric lengths? It seems like you would need to be able to calculate it without trial and error if you use a gathering foot that actually seams as it gathers.
BTW, I’m a brand new serger user, so if something seems obvious, go ahead and call it out — I really may not be aware of it.
Edited 3/28/2007 12:24 pm ET by myca99