I need to machine 17mm thickness sheets on a CNC engraver/router and require suitable clamps which can secure the sheets down but still allow me to machine all of the top surface. Can anyone suggest the best method/item to use? I have considered Veritas Wonder Pups but the shank is slightly too long. I do own a vacuum system but the sheets are not perfectly flat each side so this method is not viable.
From contributor K:
Sheets being not flat is about the only problem I run into these days. You can fix it down on some other MDF sheet with screws is the waste part of the sheet, and have the machine drill the holes so you know where they are for avoiding. You can put weight on it - dumbbells or window counterweights. You can use (clear ) packaging tape on the edge of the sheet and spoil board so the vacuum can't leak - this is the best.