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Old 10th Feb 2019, 7:41 am   #16
Argus25
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
Default Re: Using hole punches on die cast boxes

If you are going to use a cone or step drill, make sure it is in a drill press with the work clamped. Or if you start of from a small diameter initially and enlarge it over multiple steps, the hole center will wander.

However, if you file out the hole to within a mm or two of the size you want, on the correct center, then with the stepped drill, it will be pretty close to accurate centering after only one step to enlarge it, even if the work is not clamped. The cumulative centering errors add up if it is not clamped and you start from a small hole.
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