Re: Using hole punches on die cast boxes
Step drills tend to leave a ridge from the next layer up so drilling the last bit out from the other side can provide a cleaner hole. With cone cuts the hole has a bevel on it too. Also, be very aware of snagging and snatching which can be painful if cutting with a handheld drill. I tend to use the slip clutch on the drill if there is a risk of this happening. If you can secure the work in a vice or clamp better still. All from bitter experience...I should have known better.
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