PCB Drill

by Geminy_Studio, published

PCB Drill by Geminy_Studio Oct 29, 2016

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Hi guys
First of all I want to apologize for my English, so if I made some terrible mistakes or something does`t make sense please let me know:)

This is the PCB mini drill. It`s my first design so if you come across some problems feel free to contact me or leave a comment. Also I am sharing my SolidWorks 2014 files so if you want you can make changes to model of your own. The motor holder part is designed to be removable, so it can be redesigned to hold another type of the motor.

The following hardware will be needed to assemble the drill:

M8 (13mm) nut
M8 x 130mm threaded rod (1x)
8 x 150mm rod (2x)
6 x 70mm rod (1x)
6 x 100mm rod (1x)
Spring (1x)

Motor (39mm in height, 29mm in diameter) , or some other but the motor holder part must be changed to fit different motor ( You can find these motors in some old printers )

and search for this on ebay :

8Pcs 0.5-3mm Small Electric Drill Bit Collet Micro Twist Chuck Tool Kit CC

Assembly instructions :

  1. Print all necessary parts ( I suggest using 30% honeycomb infill , supports only if the are needed and 10mm brim at least for the body part)
  2. Get ready the metal parts and the motor
  3. You fill need to finish the body part with 8mm (8.1 or 8.2) drill, to fit the 8 mm rods tight but free to move.
  4. Stick the 8 mm rods to the stand, insert height_wheel into back of the stand and insert the treated rod trough middle hole on the stand a try to screw it into the height_wheel ( no need to glue it )
  5. Fit the 8mm nut to the body part, close and glue it with nut_cup (with acetone).
  6. Insert motor to the motor holder and then try to put on the drill head,
  7. Connect motor holder to the slider part. This is designed to be tight fit so before you try you should use sandpaper on both parts and finish the surface a little.
  8. Put the body on the stand , put on string and insert slider with motor.
  9. Put the top_end part on.
  10. Now you must insert gear to the 6x70 metal rod. This is kind of tricky. Drill the hole on the gear with 6mm (6.1 or 6.2) drill to make tight fit with the rod. First insert the rod trough one hole on the back of the body part, then slide on the gear and then try to push the rod into the opposite hole on the body. ( You can chose on witch side you want to have handle. Left or right.)
  11. Complete the handle by inserting handle_clutch on the longer end of 70mm rod, insert the 100mm rod into the clutch and put on the handle_end part.
    12 Now you have to fix somehow the gear to the 70 mm rod. This is up to you ( until I remake this part to be more easy to assemble) . I drilled 2.5 mm hole trough the gear and the rod and glued in a piece of 2.5 mm welding wire. Otherwise the gear may be sliding when the force is applied to the handle.
  12. The drill should be complete now, Last thing you must do is solder some wires to the motor,connect to 12V (1,5A) power source, and try to drill some holes :)

10.4.2017 Motor holder for motor 47mm x 28mm STL was added


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I apologize for not making any final adjustments to this model. I simply don`t have time :( There are know some minor problem with this model and I would be grateful if somebody make a remix and fix some issues.

don't worry about your English, it's fine

what is the size of the spring?

the one on the picture should have a height of 18-20mm, an outer diameter of 12mm and 1mm thickness. I bought a 25mm long spring and it is too long! The inner diameter should be at least 9mm I guess.

Comments deleted.

Hi Geminy,

Thankyou for your work on the PCB Drill.
I would like to make and use a number of these with my senior High School Electronics classes this year.

The design is aesthetically pleasing and looks like it could stand up to use in a classroom.

I printed one in PLA at 0.2 layer height as a test and had all of the necessary hardware 'in stock' as a result of dismantling a number of printers.
As students can be quite hard on equipment in the workshop, might I request modifications to your design files based on the following issues encountered during the build;

Stand - Cavities for M3 nuts and screws to retain the 8mm side posts.

Top Post Cap - same as above ..to prevent inadvertent loss of the post cap.

Motor mount - modified to permit full (level) engagement of the (47mm long motor) mounting slide with its socket in the body and clearance between the Motor Mount and the nut housing.(See attached image.)

Post Frame - The holes which support either end of the 6mm gear axle printed somewhat oversize (about 7mm). I enlarged these to 8mm and fitted a couple of machined nylon bushes - reamed to 6.2mm. Could this size be reflected in the original file?

Handle Clutch - The Hole for the 6mm Handle also printed somewhat oversize (about 6.5mm) which makes it hard to retain the handle.

  • I was fortunate to find a knurled end on a 6mm rod for the Gear axle and I think that will provide enough interference to retain the clutch on the axle but I do not yet know how to retain the Handle.

Gear - The gear as printed was a little large on the first occasion and did not fit well in the gear rack - so I re-printed at 95% scale and it fitted with no problems other than reaming the centre to 6mm. Even so, there really does need to be a better way to retain the pinion gear on its axle. I will use a 1.6mm diameter roll pin in the prototype as you did. At least, the boss needs to be a little longer and maybe thicker to allow for a pin.

On a similar note, I have seen another PCB drill on Youtube which has a DC power socket, power switch and even an Led for workspace illumination.

I appreciate the time you have already spent on this project. Any improvements you are able to make would also be appreciated and go to making a great project so much better.



This is the coolest thing ever. I am going to make one of these this weekend.

Thank you for sharing the SolidWorks 2014 files. I was able to quickly adapt the 6mm & 8mm rods to sizes 1/2 & 5/8 inch. I am printing the stand now.

You probably won't mind if I use this as a part of my instructable (It's about scavenging an old light for useful parts and it happens to have the long awaited rods for this drill)? I'll post a link here (if the Instructable site allows it) or otherwise reference this in the instructable.

Of course not. Go ahead! :) Just send me a link to this instructable when you finish it. I'd like to see it !

I made one. but, some slide parts didn't fit each other. This is my printer's problem (corner ringing) and I had to grind. and the gear was much bigger. I made new one. anyway, I appreciate your gift.

My printer is making 0,5 mm difference in hole sizes. Otherwise print`s ok. I always have to compensate in my design for that difference.

Just a quick question, what is the spring you used?

I am a beginner and look at what other people construct.
I find your work great.

Thank you very much for your kind words !

I really like the design of this. Well thought out. Thanks for sharing the SW files too. Keep up the great work!

Thank you. More is on the way. I am adding SW files because most of the time when I download some design I need to customize it for my needs so i figured others may want too:) So why not make it easy for them.

Exactly, I don't have the exact size of rods on hand but some that are very close. A simple dimension tweak and this project can move forward without having to wait for parts to arrive. I also like how the motor mount is interchangeable. Very clever. Looking forward to your future projects.


Check my channel. There are some interesting projects. Maybe I will upload some parts from them..

Sure...you can use this motor. Or if you find some at home just send me dimension and i will send you new motor_holder part.

Be aware that many PCBs are made of fiberglass, and that the dust from drilling can be hazardous.

Breathing outside air is more dangerous these days :)

Hey Thanks, printing the base now as we speak.

Let me know how it goes :)