Re: Using hole punches on die cast boxes
I've been using Q-max punches on die cast aluminium boxes of various makes, Eddystone, RS, Hammond and possibly others for over 50 years and never had problems with the box cracking. I have a set up to 50mm and I don't think I've had any trouble up to at least 35mm; I'm not sure I've used the biggest ones on die cast boxes.
I don't often use the ordinary hex (Allen) keys but usually 3/8" square drive hex bits and a ratchet handle. As advised in the instructions, adequate greasing of the punch and screw is useful.
I have however had reports of curved castings of street lighting lanterns cracking when using screw-up punches but I couldn't be sure of the care/skill/experience of the operator. This was in an attempt to avoid the crude, uncontrolled holes when using a cone drill.
Hole saws are effective but less accurate than screw-up punches and if used in a hand drill, the drill must be fitted wth a side handle to avoid serious injury.
PMM
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