General > General Technical Chat
My metal workbench keeps shocking me (and related ESD questions)
coppercone2:
don't do a wood to metal safety ground. Put a insert into it and then screw into that or something along those lines. You want the spring that attaches the metal to the wire to be all metal and not have a wooden part. If it dislodges from the wood, you should still have a reliable safe electrical connection. A wooden washer is precisely what can get you into trouble with wires. How much do you trust a piece of wood to hold screw pressure? Maybe there are exceptions with certain kinds of wood or whatever (iron wood comes to mind), but it seems unreliable.
A epoxied to wood hole brass insert comes to mind, but make sure the threads are clean. I recommend that you put other screws that are mechanical to hold it down though, and that method is fine, so its protected from heavy equipment sliding around incase you need to repair a boat anchor.
If its all one piece go in from the side with a router or drill to make a cavity/cave that you expose flat sheet from on the top of the hole (use a chisel and sand paper files to clean it up) and bolt it down in that location with a bolt-sheet-nut contact, if you have a metal top thats glued to wood and not suitable for easy grounding. Keep deformable material out of screw tension path for electrical connection. If you do this, add good strain relief to the table side and some bumpers to prevent it being smashed on wall or get creative and go in from bottom etc (clever carpentry).
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