I am working on a video showing the impact of sparks on hardened steel with huge magnification.
The first strike leaves a crater of impressive 0.7mm:
![](https://cdn.hackaday.io/images/2214001689707569148.jpg)
99 "shots" are needed until the 1mm drill finally dives into the blade with no more sparks forming:
![](https://cdn.hackaday.io/images/5285761689707638745.jpg)
No perfect result, yet.
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