Hi guys, this is my first instructable, my english is bad, I take terrible photos, so... :)
In this tutorial I will show you how to make a cheap drill.
Note: I found that the diameter of the compasses' leg's are 3mm in most cases. So try to find a motor with a 3mm axle, and the holes on the terminal should be 3mm too. With a 3mm terminal you can use any dremel tool, if you replace the "chuck".
Take apart the compasses, we need the component marked on the picture.
Actually, it is a mini chuck. :)
Now take apart the terminals with a knife. Remove the plastic, we only need the inner metal part.
Mount it on the motor.
Insert the compasses leg into the hole.
I replaced the screws with newer ones.
Now we are ready. :) If you want you can solder wires and a switch to it. I didn't solder them, because I use it with crocodile clips.
You can easily use 2-2.5 mm drills, for the smaller ones you need to put on some electrical tape or thin wire to the drill to fit in the chuck.
Now try it on an old PCB, or something else.
I give 12 volts to it from an old ATX psu.
Here is my first DIY drill, I made it before the instructable. Actually it is the same, but I mounted a push button to it, and I put on some electrical tape so it is more ergonomic. :) I made this for only PCB drilling so this is why the the drill bit is so short.
Step 8: One more thing - new screws for the terminal
So I decided to add more steps, to make our drill better.
I didn't like the old one with the two long screws, so I made two mini screws.
First of all, find a screw which fits in your terminal. Put it into a vise or grip it with a plier.(I don't like the original screws, they are "weak")
Then take a saw and cut them or you can use your DIY drill :) - fortunately, all of the dremel tools fit in the terminal.
Step 9: One more thing
Then cut a small line on the top of the screws.
Step 10: Last thing
Last step, I promise. :)
Not necessary, but you should do this. Take your mini chuck (the compasses' leg), and place it in a vise or grip it with a plier. Then we need a small metal or diamond file, and you have to make a small flat area on the chucks axle. (The reason why I did this - the screws in the terminal will provide a better grip on a flat area than on a circular axle)
Step 11: The finished drill
Now we are ready, I guess. I think it looks better.
Step 12: The finished-finished drill
I found a small plastic tube and my motor perfectly fits in it. :) Then I put on some heat shrink pipe, so now it is indeed finished.