HandGrinder for Less Than $1

Hi, this is my first instructable. This project is very simple and easy, you can do it in about half an hour.
Maybe you have seen some sanders made of old HDD´s but this tool can sand, polish and cut.
I've got the idea from: https://www.instructables.com/id/Recycled-HDD-Powertool-Disk-of-Prometheus/
I didn't take any photos during it's construction but with the images and diagrams you will able to do it.
You can cut bolts and screws, it's very safe, the blade won't break because it doesn't have too much power, and if you use it wrong and you jam it the thing will stop preventing breaking things.
This is a very useful tool when you need to repair your bike, like cutting old chains.

Almost everything in this tool its recycled, except the zip ties.
Tools:
- Torx screwdriver set (I buy it and used it for a lot of projects, price for a 6 pieces set: $2)
- Maybe some glue
- Soldering iron

Materials:
- Tape
- Some screws (From old stuff)
- A piece of wood (recycled from a fruit crate)
- Some thin wire
- Momentary switch
- Zip ties about 6
- A HDD that you can remove the motor, in some models its fixed to the mainframe, we can't use this ones.
- RCA female connector and male wire (both recycled)

For the power supply:
If you will use an AT/ATX power supply you just will need to plug it in.
BUT, you can use batteries (two 9V) or a 12V power supply.
For batteries:
-2x9V batteries
-L7812 and L7805 power regulators.

For 12V power supply (you can make one or recycle one from a VHS recorder or other thing)
-Just a L7805.

I didn't take any photos for this step but its very easy. Remove all screws, keep the motor, the PCB and the screws that fixes the disc. You will need to keep the separators and all the discs too.
You can find more information on the internet. Sorry!

You can easily assemble this tool looking at the pictures but there are some things that you will need to know:
There are 3 terminals in the motor solder one wire to each one and then solder that wires to the terminals in the PCB.
Look at the diagrams to make the electrical connections.

You can adapt a cutting blade like I did. Just take the center metal ring and with a sand or a dremel make the hole bigger, in every HDD I disassemble the center hole diameter its 1".
ATTENTION:
It's not my responsibility what you do with this tool.
Don't use it for illegal purposes.
Use safety glasses!!! Always watch the blade, don't be too close to it.

You can make a safety cover like in the pro tools. I will make it you should do the same.

Thank you for watching!