na not really, just lots of pics and vids of me monkeying around with them. They cost me about $900 to build minus the base and a bushing which I had a machinist at work make for some whiskey, Mac’s are I think around $2800 depending…
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The tilting feature on Mac’s clamps is very useful to push or pull your work tight against the cross cut fence. It helps prevent movement when the clamp extends. The OEM cam clamp is an example where if things aren’t exactly perpendicular, the wood can move. By setting the clamps at a slight angle, the wood stays tight against the reference fence.
one of the other nice things about Mac’s clamps is that it is very easy to use the clamps together or flip a switch and use them one at a time. The custom valves he uses allows police Kathy O’Connor g how you want them to operate separately or together.
they are particularly nice when handling larger work pieces. It’s very easy to get the work positioned and lock it down without walking back and forth. They are also self adjusting for wood thickness. Expensive, but like several have said, once you’ve used them, worth every penny.
I hate spell check….. the valves allow you to decide if you want the cylinders to operate independently or together.
I prefer to clamp straight down and never had any issues, I don’t always clamp against the fence so i would assume you need to adjust them so they don’t push the material you are clamping?
Also that special valve is a plain ol’ shuttle valve, the rear clamp has an extra port drilled so air flows through to the other clamp instead of flowing out of the exhaust