Turn Your Junk Hard Disk Into a Tool Grinder





Introduction: Turn Your Junk Hard Disk Into a Tool Grinder


Turn your junk hard disk into a tool grinder!

note: this not my original idea, this was already featured here in Instructables before. 

I just want to submit my own version. I also found out not all Hard disk can be converted to a grinder, some won't spin when you rip out the read/write head, while others, motor are too weak and stop spinning when load is applied.

So far, i discovered that a Seagate Barracuda 3.5 inch desktop hard disk has a strong motor and spins at 7200 rpm. I used the 20GB and 40GB model..

Just follow my pictorial instructable here if you plan to make your own.

Step 1:

Tools needed:

1, torx screw drivers set
2. Phillips screw driver
3. sharp x-acto knife
4. pliers if needed
5. clear goggles - for eye protection 

Parts needed:
1. Old Seagate  Barracuda hard disk drive
2. Different Grit water proof sand paper (floor sander paper recommended)
3. Power supply - 5volts/12 volts, the one used for external drive.

Step 2:

remove top cover with a torx screw driver, i used the number 9!

Step 3:

Next step is to remove the very strong magnet and the read/write head assembly.

Step 4:

Now, remove the disk, then use it as a pattern to cut your sandpaper to its shape..

Step 5:

with your sandpaper already cut, put it over the disk and mount the disk back to the motor, be sure to install the aluminum spacer first, so that the sandpaper and disk is on top, before screwing in the round clamp...

Step 6:

connect to your power supply and fire it up! viola! your own mini grinder!! when the sandpaper wears out, just cut another one and replace it....

Step 7:

I made three of them with different grits, coarse to fine...second photo is the power supply i used, it has an on/off switch on the wire going to the hard disk, very useful to restart if the motor stop spinning....

Thanks for Looking...


  • made it!! :)i used i...-Evan Chan

    Evan Chan made it!


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What types of glue did you use/try for this project?

for me double sided tape works best because there are less bumps when applying the adheresive

rubber contact cement, apply on both surface let it dry, then join the two together.

rubber contact cement, apply on both surface let it dry, then join the two together.

Great job! But I would use the disk as a template to cut others metal discs... And on each one I would glue a diferent sand paper. And, of course, keep the original disc to make more in the future. ;)

I wanna try this !!

How Can I make them continuous running ?

Please help in recycling HDD has four sockets by external circuit? What are the power supply circuit to him?
Thanks for attention

for ide type [+5V gnd gnd +12V]