Feeds and speeds on a waste board

I made my own. The are very similar to the wood clamps that you can get with an X Carve but mine are made from aluminum. I have seed some that have a big arch in them but that can easily get in the way of the carriage. Mine are low profile and I use a variety of 1/2 20 bolts inside the tracks with regular 1/4 20 nuts to tighten them down. To keep them level with the stock, I usually have something that is the same thickness as the stock I am clamping down. Put that under one end and the clamp on top of the stock to carve and they hold extremely well.