Some of the special stitches with the cams need different settings. Needle position, width, ect.
Do a search for manuals for your exact machine and you should be able to find it online. I did for mine. I have a Singer 1030 and it uses cams also. Below is where I got mine from. I downloaded and printed it out. It is a good place to start. Had loads of other information also. I oil and clean my own machines instead of taking them in. I have an older Singer that has to be oiled.......my 1030 doesn't.
http://www.sewconsult.com/singer_ins...on_manuals.htm
Hope it helps,
Linda D.