Machine sews fine when it is set up on a table, but when it is on the Gracie II quilting frame and operated by their stitch regulator, the stitch quality is very bad. It varies from fair to very bad - I assume it is the stitch regulator, not the Juki - right?
Sewing Machines - Juki - TL-98Q
Answers & Comments
Use a carpenter's level to level up your frame, and be sure to keep the quilt leveled up to barely above the throat plate on the machine, and level front to back. Check the connections on the regulator sensors. If even one is not making good connection, you'll have skipped or broken stitches.