Prepare to Drill Metal : How to Use a Center Punch by Jason von Techshop
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Step 2: Mark Your Material

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A center punch has a fine point so it can get you great accuracy! Making a good center punch mark means you can be sure your hole will drill nicely before you've even drilled it.

Therefore:

Measure and mark as accurately as you require!

* A criticism of the example below is that those pen marks are very wide! I could make a sharper, more accurate mark with a scribe.
 
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