You asked: What is a straight stitch sewing machine?

A straight stitch is a strong stitch that’s straight with a thread on top (the upper thread) and a thread on the bottom (the bobbin thread), with the threads interlocking at regular intervals. … Tension adjustments are available for the upper thread on the sewing machine and by way of a screw on the bobbin case.

INTERESTING:  Is crocheting a blanket expensive?