UPDATE 09/04/2011: Hey guys, I have entered the Disk of Prometheus in the Green Living and Tech. Contest, Please VOTE for me!!
In my last instructable related to recycling old HDDs, I had designed a sander from a junked HDD for as little as $5. But, the old design had its limitations and i had got a lot of people writing to me about improving the design to increase its usefulness. You can find the old instructable here
The older HDD sander had its motor still attached to the HDD base, thus limiting its use. In this instructable, we're going to design a power tool using an old hard disk , which can not only do sanding, but also cutting, polishing(buffing) and it may also be equipped with a diamond blade to cut glass.
The HDD motors spin at a very high RPM, but do not have much torque,but once they get into full speed('bout 7200 RPM) it is enough for our grinding/ sanding/buffing etc. purposes.WARNING: The HDD is not a plaything. The platters spin at a very high speed, making it easy for the sander to rub your finger raw. I am not responsible for any damage you do to yourself or to anyone else near you.