Ok. So i have to to make compression test samples which should be really easy. I'm making them out of 6061 Alumium 1" Diam Round stock. I just have to turn down the stock and face both ends so I get a 2:1 Length to Diameter Cylinder with as nice a finish as possible. So I turn down the stock to get a nice finish and then I face one end. When I do this I get a Burr but I've just been using high grit sand paper to take that off, any advice on machining it so there is no burr would be great. So now I have to flip the part around, part off the non turned down length, face and deburr the other end. However I've been hit or miss all day as to wether or not my I''ve tightened my chuck enough without leaving bite marks in my pretty surface finish. According to specifications my finish needs to be 63 micro (Mu) inch or better. If I just barely tighten it so as not too leave marks I end up being too light and pushing my part in when I try to face it.
So Basically Is there any way to reduce the possibility of bite marks without causing the piece to be pushed into my chuck when I face it because it's too loose. I'm thinking that this might actually have to come down to experimentation and a torque wrench but if anyone has any tricks I'd be very happy to learn them. I told myself just wrap the part in one layer of paper towel, but then I processed that thought and remained without a solution.