Originally Posted by
DVM
I hope someone has a suggestion that will help. I am using a 15-91 in good condition to sew vinyl for boat seats. At a slow speed I get the 6 stitches per inch I want (and the machine it set for). However, the faster I sew a seam the shorter the stitches get. Is there an adjustment somewhere that I am missing?
Haven't had that problem myself even at full speed so i'd try adjusting your feed rate