So I am running a cnc mill and I have had some problems with the parts rotating while I am doing any radial drilling. I clamp the part to the chuck and then when I go to drill 1/2 inch NPT ports the part tends to rotate. I guess my question is if I am clamping it on the ID of the part is it best to have a wider clamp on the front even if the entire face doesn't touch the jaws of the part, or does that not really matter?