Hold down clamps, what do you use?

[HankMcSpank]

Here's what I've implemented (the green touch off sensor wire is bottom right of picture) & the croc clip attached to Jonathan's spindle mount!)...



the beauty about a long clamp is that you don't need a lot of force to hold down the board, which means less warp upwards in the middle of the board.


it's very simply, but if you mill pcbs often, it's definitely the way to go

[Jonathan]

you don't need a lot of force to hold down the board, which means less warp upwards in the middle of the board.

Hence I just use double sided tape for PCBs. No distortion as well, no force really...
You could drill a 4mm hole somewhere convenient in or near the spindle mount and put a 4mm 'banana plug' on the wire. Annoyingly that method doesn't work for me since. presumably, the oil in the spindle bearings is electrically insulating the tool so I have to clip directly to the tool.