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Step 4Drill holes in Hard Drive Platters
The drilling of these holes should be fairly easy, all you will need for this is a drill press, but a milling machine would make it easier. I just used a drill press. You will need to drill eight holes 25 mm from the center of the hard drive disk. These holes will be spaced 45 degrees apart. You can easily plot this out on a piece of graph paper with a protractor before you drill it to ensure it is correct spacing and everything. And it is ok if the holes are not at the exact space on every disk because they are not on mine and it works just fine; just make sure they are no more that .030" difference. When drilling these holes remember to use a sheet metal drill unless you figure out a way to keep them all together while drilling, because it will warp your hard drives. Also you may want to look at the hard drive layout file for some help on what to do to lay it out. You will need to make eight of these. Ohya and use a 3/8" drill bit for this. Also do not use the diagram that I made because the holes on that are too far off the make this project be same, it WILL be off-balanced if you were to use that it is just an example to help you.
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You can make most drill presses reverse by altering the wiring on the motor. There's usually a diagram on the inside of the wiring case. Personally I put a switch on mine to make it easy. :)