Old Computer HDD Hack!

How to convert an old, broken computer SATA hard drive(HDD) into a very nice, DIY variable speed, diamond grinder sanding tool for metal (sharpening tools) or stone. In this DIY how to video, I'll explain exactly how it's done, and demonstrate how well it works. Enjoy!

*Link to the 555 drive circuit:
http://www.electroschematics.com/8609...

**If you don't want to make the 555 drive circuit, then you can buy a servo tester for little money at the link below.
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*Link to ESC:
http://bit.ly/2iuHaOA

**Package deal for both shown above: http://bit.ly/2kySjTz

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