Originally Posted by sewfunquilts
There are different "quilting threads" out there, so you have to make sure you are not buying the kind for hand quilting if you plan on using it in your machine. The hand quilting thread can throw your timing/tension off on your machine.
100% cotton machine thread is best, but I use the cheaper Coats & Clarks double duty for my scrappy quilts too.
Good luck and have fun.
Don't use the heavier weight quilting thread for piecing. It will take up too much room in your seam, and throw off the size of the pieces. I like to use Aurifil or John Flynn's "So FIne" from Superior threads. Both seem expensive right of, but have a lot of thread on the spool. I generally order them both online from Superior Threads and Red Rock threads.