I'm looking forward to getting the big machine up and running. It's been fully cleaned and serviced, just waiting for the table so I can get to playing with it.
There are two types of attachments, the simpler ones do a mock hemstitch. You sew two fabrics together like a regular seam, and feed so one goes under the attachment and the other goes over, so they are sewn with a space in between.
Then you fold the seam and pull apart exposing the stitching, and tack down each side. True hemstitching pokes a hole into the fabric (pushes the threads apart) and then tacks the hole open on each side.