Quilting on a machine frame is like dancing. There are many factors to consider before the dance will be fantastic. Which type of frame you have is
a big factor, some are more conducive than others. The quilting machine itself needs regular cleaning/oiling. Some machines are more complicated than others. It could need additional thread guides or need to be timed more frequently. Never use canned air in the bobbin/ race hook area. It pushes little pieces of thread deeper which cause it to seize up later. Just use a brush to clean the area. (ask me how I know)
Thread is a huge factor. Using different weights of fabric on the top and bottom require tension adjustments. Not a big deal to do but you must be willing to adjust that bobbin tension from time to time. Unless you turn the screw way too far you can't do much wrong here. 1/4 turn will not ruin your machine. :wink:
The height and tautness of the quilt on the frame will make a difference as well. The speed at which you quilt also factors in as does the fabric and batting and needles. Lots of little things that when working together will make your quilting experience very pleasurable and beautiful. One little thing off will cause you to curse and want to throw your machine out the window. :shock: Patience, think things through. Figure out what changed before the problem started. So many little things to consider.
When it all works it is amazing. :D