how to make Keyhole with a CNC

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So, I made a stacked keyhole design This is not a true keyhole in that the back is not engraved to create a slot for the head of whatever is

Keyhole Slot Cutter Ø mm S12  keyhole slot depth When routing a keyhole slot in 34 wood, what depth do you recommend? 38 Or depending on the bit, make the depth

slot demo mahjong TCT Keyhole Slotter Single flute keyhole slot router cutter for hanging items flush to a wall by making an aperture in the back of the workpiece  This brass insert takes all the trouble out of making a keyhole slot for hanging pictures or other items