This page shows off how I clamp down material on my CNC. It has worked well for me, so I thought that I would share.
The Clamping System
I use two boards and two threaded rods to hold the material in place. You can see them in the pictures below.
The board on the right is bolted to the CNC. One side of this board was planed down with the CNC router so that it would be at a 90 degree angle to the Y axis all along it. This wasn’t absolutely necessary, but I figured that it would make things more accurate.
The board on the left is not attached to the CNC in any way other than the threaded rods. It does not seem necessary for it to be held down, so I just left it alone.
The material being cut in the above and below pictures is 3/4″ plywood. You can see that it is held in place between the two boards with the threaded rods. The nuts on ends of these threaded rods are tightened down with a wrench to insure that the plywood cannot move.
Some time in the future, if I ever get around to it, I plan on buying some long wood clamps to replace the threaded rods. With wood clamps, clamping stuff down on my CNC should be a snap. Assuming that they won’t vibrate off while it’s running that is.