3 total. Use all 3, all the time. My original 1967 Singer 600 (gift from parents) 1956 Singer 401A (was my mother's) and a Janome 415 I bought used in 2009. I normally have all 3 set up, each with it's on project. The Janome is not good at holding tensions so I have to keep a close eye on the stitches.