Technically? Alot. If your question is there ultimately any difference in functionality, then not so much. If you’re careful, you can start a guide dimple with a hammer and nail easily. The advantage of the auto punch is that it’s smaller, lightweight, and since it uses the force of the internal spring for the punch, a hammer isn’t needed. This all means that you can theoretically do more punches faster and more accurately, and use less energy to do it.
If you want to make an indentation at a precise location, automatic center punches are significantly faster and easier to use. They are able to replicate the effect of a hammer hitting a nail, in a single tool that can be used with only one hand, in smaller areas.
The disadvantage, is that they only do one thing.
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