In this instructable, I am going to show you how to make a simple yet effective miniature engraver and drill out of some common items you have probably lying around in your house. --- Yes! This means it can be virtually FREE!
Due to the restriction of the amount of power on the tiny motor that is used, the engraver works better than the drill. To overcome this problem you could use a larger motor with a higher voltage but you would probably have to choose a thicker drill bit as it will have a thicker shaft.
Because this product is so small, it can be taken with you virtually anywhere and be put to use.
> Small motor with a relatively low voltage. Also the shaft should have the same diameter as the drill bit and inside of wire casing.
> 2 pieces of wire that are approximately 30cm long.
> Small switch.
> 9V battery clip.
> Wire casing - the same diameter inside as drill bit and motor shaft so they fit snuggly.
> Drill bit - the same diameter as motor shaft and inside of wire casing.
> Pen lid - Preferably on from a BIC pen as thay have only one hole at front.
> 3 1.5V AA Batteries
> Triple AA battery holder with 9V battery clip
> Solder wire
> Piece of pen grip
> Piece of plug pin protector
> Soldering iron - Be carefull as it can burn you and dony inhale the smoke, do it in a well ventilated area.
Below is the finished product
Step 1: Soldering the Circuit
Step 2: Attaching the Drill Bit
Step 3: Putting It All Together, Making It Look Pretty and a Result
Then I took the whole motor assembly and inserted it into the cap. I then used a dowel to push the motor in to tighten and secure it in place. Hot glue can also be used.
After that I cut a piece off a plug pin protector, put a slit down one side and then put it over the switch contacts to protect then and make it all look neater.
Also, as there were loose wires which are prone to breaking, I took a long piece of string to neaten it all up and support the wires.
To hold the string in place I taped it to the 9V battery clip. On the other side I tied a knot and then stretched a part on a pen grip over the lid, then I tucked the string underneath it.