How to Make a Mini Dremel




About: Here i feature various projects from my YouTube channel and website. i do lots of small office supply weapons and some small vehicles too and some stuff that might be used for science experiments. i try to d...

In this instructable i make a mini dremel cutting tool out of a few very cheap and easy to acquire materials. The mini dremel is great for cutting through small pieces of wood, plastic and Styrofoam. Its also portable and wireless which adds to its convenience. Building this is a great intro into the DIY/ hobby world and will also add to your collection of tools. Have a look through my instructable to see how it's build or check out my video to see the full tutorial here

Step 1: Materials

Listed below are the materials i used for this build

-A small motor (these small motors can be grabbed out of any dollar store motorized vehicles)

-A 9 volt battery

-A 9 volt battery snap on connector

-A switch (can be taken from any electric dollar store toys)

-A couple Popsicle sticks

-A metal bottle cap

-A Pen

Step 2: Wiring the Dremel

I start off by snapping the connector onto the 9 volt battery and gluing it onto a popsicle stick.

After this i start to wire the circuit containing the motor, the switch, and the battery. For this i used a push button switch instead of a regular one but either work.

I wire one side of the switch to the battery and the other side to the motor.

The remaining two left over wires can then be connected.

For this circuit you need not worry about which side is positive and negative because it will only make you dremel spin the opposite way

Step 3: Completing the Body of the Dremel

Once the wiring is complete i put more glue down against the Popsicle stick and glue down the push button switch and the motor to Popsicle stick. Be sure to be generous with glue so nothing comes off later

After gluing everything in place, i cut off the extra bit of Popsicle stick that was sticking out.

Once that is done i size up another Popsicle stick and glue it on top of the motor and battery as seen in the last picture

Step 4: Preparing to Mount the Blade

I now remove the center part of a pen, the part that holds the ink.

I push the open end of the pen pipe onto my motor and cut it down to 2.5 cm long. This will be where the blade of the dremel will be mounted

Step 5: Making the Cutting Blade

To make the cutting blade i first obtain a bottle cap and cut it in 4 corners. Each cut should be separated by 90 degrees so that the sides will fold out when i try to flatten it.

I then lay it on a hard surface and hammer it until it is flat

Step 6: Adding Teeth to the Cutting Blade

Now, using scissors or tin snips i cut out teeth into the cutting blade.

I found that teeth which are wider and not as deep work best because they well not break off as easily.

Step 7: Mounting the Cutting Blade

Once the blade is flat and has teeth in it, it is time to make a hole in the center and mount it.

For this i started off by poking a hole in it with a hammer and nail. I create a hole big enough so that a small screw will fit through the hole.

I then insert the small screw into the hole and screw it into the part of the pen that was attached to the motor.

Step 8: Alternative Blade

As an alternative blade i also attached with glue an abrasive blade that is used on actual dremels. These abrasive blades are cheap and can be found at hardware stores.

Step 9: Testing It Out

Now that the blade is on we can test it out. As you can see it cuts into Styrofoam easily and plastic as well, but with slightly more difficulty.

Thanks for taking the time to read until the end of my instructable. If you go ahead and build it, make sure to leave a comment and let me know how it goes. If you plan to build it, you should also check out my video so you can see clearly everything that was done.



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    9 Discussions


    2 years ago

    what a terrible idea.


    2 years ago

    making a blade is unadvisable. a friend of mine lost 6 pints of blood by trying it. it works well until the cold work turns the metal brittle. I wish these things would stop showing up on instructables.

    5 replies

    Reply 2 years ago

    Your friend made a large blade probably for some sort of table saw or cut off saw. this blade is light and doesn't get spinning too fast. if it broke off i doubt it would have enough momentum to even cut you. Only danger i could see is if it broke and hit your eye, so i will be sure to advice people to wear safety glasses


    Reply 2 years ago

    You are not correct in your assumption. It was a small device similar to this. It is spinning fast enough to take out an eye or nick an artery..


    Reply 2 years ago

    Hmm....It might be advisable to put in a warning that this project is hazardous and that proper safety precautions are needed. No one is forced to make this project, and anyone who does who didn't read the warning and gets hurt has only to blame themselves.

    The randomness of the trajectory and force of a broken piece of metal is something to be wary of. The probability of getting hit and being seriously injured (a small nick is not seriously injured) is very small (sir, you have outlined a very specific situation). However, it is paramount that proper safety precautions are taken, possibly more than just safety glasses...


    Reply 2 years ago

    If you don't believe me just think about it. Its made of a beer bottle cap. If a piece of a beer bottle cap fractured and was thrown at You, would it do anything worse then scratch you.


    Reply 2 years ago

    You obviously don't think this is dangerous. I do. To put it in engineering terms: The cold working done on the blade makes it brittle by reducing the interstitial gaps in the crystal structure. The moment of inertia puts the blade under stress. This stress causes strain, and because of the high brittleness produced by the cold work, the slightest fissure in the crystal matrix of the metal will result in catastrophic failure. Once you have flying bits of metal, accidents will happen.