Strip piecing?
Ever time I strip piece the stitching pulls up the fabric and the whole thing gets a bow in it. We cut the strips with lengthwise grain as suggested by Judy Martin. I have Bernina Artista 640, a Bernina White Pearl, a Viking Mega Quilter, a vintage Singer Feathweight, and it's big sister a vintage Singer 301. I try to feed the fabric loosely and guide gently and have a fairly short stitch length. Same problem with every machine so it has to be something I'm doing wrong. WHAT IS YOUR SECRET??? I'm taking a class Saturday on a strip pieced pattern. And expanding the pattern to make a huge King Size quilt for my own bed. (I'm tired of having king size blankets not be wide enough. We have 2 twin adjustable sleep number beds shoved together to compose a king so we need extra width.)