Introduction: DIY Mini Drill

Picture of DIY Mini Drill

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.


-DC motor
-Terminal block

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".



Not necessary:
-Electrical tape

Step 1:

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Take apart the compasses, we need the component marked on the picture.
Actually, it is a mini chuck. :)

Step 2:

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Now take apart the terminals with a knife. Remove the plastic, we only need the inner metal part.

Step 3:

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Mount it on the motor.

Step 4:

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Insert the compasses leg into the hole.
I replaced the screws with newer ones.

Step 5:

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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.

Step 6:

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Now try it on an old PCB, or something else.
I give 12 volts to it from an old ATX psu.

Step 7:

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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

Picture of One More Thing - New Screws for the Terminal

So I decided to add more steps, to make our drill better.

Finishing touches...

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

Picture of One More Thing

Then cut a small line on the top of the screws.

Step 10: Last Thing

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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

Picture of The Finished Drill

Now we are ready, I guess. I think it looks better.

Step 12: The Finished-finished Drill

Picture of 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.


amiir made it! (author)2015-06-29

the terminal block is a good coupling and worked alot in my projects.

i always have problem with making screws short.

i made mine just for taking photo and put in your instructable :D

ChristopherN7 (author)amiir2017-02-25

What type of electronics might I be able to salvage one of these terminal blocks? Can u please list as many common electronics or appliances or etc. as possible. So I can hopefully find one on something I have lying around.? Thank you

amiir (author)ChristopherN72017-03-08

you can buy from any electrical stuff stores. the terminals are not expensive. you can buy some and use in your works. also you could find one of those in old halogen lamps transformer. or transformer of Fluorescent lamps and many other stuffs. but simple way is purchase from store.

deskpro256 made it! (author)2017-03-07

I made something similar. I couldnt find anything like what you had, and had literally no money, I found I could use and old syringe and somehow worked with that. Works pretty decent. But I still want to try your type, seems a lot more rigid.

I'm powering mine with a switchable power brick (3-12V 1.5A) and seems to be great for it.

cguerrero chavarria (author)2014-05-09

I made it, i try to find the compasses but i couldn't, so i try to made the same diameter the two things and it drills pretty sweet, regards from Quetetaro, Mexico.

Excuse me What type of electronics might I be able to salvage one of these terminal blocks? Can u please list as many common electronics or appliances or etc. as possible. So I can hopefully find one on something I have lying around.? Thank you

Hey, this i bought it from a hardware store they are used for conecting cables together mechanicaly, maybe in home depot you can find them, good luck, cheers from México

SerhiiB1 (author)2017-01-03

Nice idea! I have similar, mini PCB Drill without a chuck :)

kkazuto (author)2015-11-28

what type of compasses is that?

AbhisP (author)kkazuto2016-07-14

Its an engineering compass mainly used by engineers for engineering graphics.

AndrásR2 (author)2016-01-23

I made it before i seen this article.The motor vibrated as hell, the motors sleeve bearing got damaged and that terminal thing blew up, almost ended it in my eye.These motors rotating too much rpm to make these unbalanced things possible.Just sayin'

radex92 made it! (author)2016-01-15

Works perfectly :)

NoynonMayta (author)2015-11-12


sina elec (author)2015-06-20

my drill vibrate too

mihir.sahu.355 (author)2015-06-01

my drill can not poke a hole in popsicle stick an vibrate more can u resolve

mihir.sahu.355 (author)2015-05-22

can a wall driller or wood drill can be mage with this attachment pls reply

roshany (author)2015-05-10

nice idea..

Roshan the innovator (author)2015-05-10

awesome helped me alot....

ace11d7 (author)2015-04-13

This is an amazingly helpful instructable

ace11d7 (author)2015-04-13

This is an amazingly helpful instructable

JaganHari87 (author)2014-09-10

Really super i ll search 4 this type method last 2 month ,,,thanks

Kante Tech (author)2014-07-16

Thanks I have been looking at something like this for a while now.

TrieuIV (author)2014-06-13

This is a ideas interesting

wotboa (author)2014-05-31

Here is the method I used to attach a micro-chuck
to a motor. Maybe it will work for this project.

See the Instructable:

liamsi (author)2014-05-15


brunoip (author)2014-03-18

great idea, just made mine

mspencer8 (author)brunoip2014-03-30

where i can find that terminal block thing? is there any appliances or a gadget that has one? please reply i making my version of there which not just a drill but a dremel also. but i'm stuck with the terminal block because i cant find that thing... any help?

ajose4 (author)mspencer82014-04-09

man it is found in all hard ware shops

ottawafm (author)2014-03-28

Love this instructable! Lots of ideas. Where did you get the compass?

jeffc61 (author)2014-03-20

Very nice work. Once again we see necessity being the mother of invention.

shantinath1000 (author)2014-03-19

Very clever and well done!

Greasetattoo (author)2014-03-19

You need someone to 3D print you a cover for the drill! GREAT job!

gigin (author)2014-03-19

I like your idea, very clever..

djokenzi (author)2014-03-18

Good job! I will probably make one of those myself.

lean04 (author)2014-03-17


very clever shaft-coupler adapter!!, it´s an instructible on itself..

Mad Max would be proud indeed..

i´ll make one as soon as i can

Szabolcs (author)2014-03-17

I added three more steps, I guess it looks better now.

pTEARgriffin (author)2014-03-16

Nice work and Congrats on being featured on

domints (author)2014-03-16

Nice idea. But doesn't it make problems with not centered axles? Because this terminal makes not self-centering connection, and if the compass part is smaller or bigger than motor axle it might be not centered and might strongly vibrate.

Szabolcs (author)domints2014-03-16

You're right. My first drill was vibrating like hell - because the compass' leg was smaller than the motor's axle. But now both of them are 3mm in diameter, and perfectly fits in the terminal blocks hole.

And about the terminal, so far It seems to me it doesn't matter.

francisdsa (author)2014-03-15

very nice. innovative. maybe you can extend it further by adding a handle which houses the batteries

Granzeier (author)2014-03-15

Very nicely done (and your English is better than many native-English speakers - sad, but true.)

I really like your idea for the chuck - that was a brilliant piece of imaginative engineering.

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