Originally Posted by Weedwoman

Can one of you guys post some pictures of a cam to better explain what a cam is? A picture of a machine with a cam inserted would really be great. Maybe, I will try and do that tomorrow -- too busy right now trying to finish a quilt's binding!

I found this on youtube: http://www.youtube.com/watch?v=9vrzLFYDfYM
maybe that will give you an idea.