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Picture of Recycled Parts, Cordless Pillar Drill Mod

I This is my first instructable and is for a modification that I made a few months ago, before getting know this website. Hence it is a reconstruction of events.

Like most DIY people, I had accumulated a number of waste cordless drills because the batteries did not hold the charge anymore and, unfortunately, it costs less to buy a new drill than change battery. I know there are lots o articles on fitting homemade battery kits but, to me, it does not seem worth the effort when I can buy a new, economic cordless drill for less than 40 Euro. Hence I bought new drills and put my old drills into storage for a rainy day.

Well, I needed a pillar type drill for a project and decided to build one Myself. I built it using info that I gathered from various YouTube videos and other websites. I also built it from scrap wood that I had lying around and other salvaged parts. I am not writing an instructable on how to make my "pillar drill" though, because it has some defects and I will need to modify it or make another one in the near future. Hence this is instuctable is about my modification to make the "pillar drill" into a cordless version.

For my "pillar drill" I first thought to use a normal drill off the mains. However, I kept looking at my useless cordless drills and thinking how I could use one of those. I first tried to connect one to a 12V power supply but it did not work because the power supply did not have enough Amps. I later discovered that cordless power drills can draw over 20 Amps! Then I thought, what if I could use the same battery from my new cordless drill to power the old cordless drill fitted inside"pillar drill". The problem was how to connect it because all cordless drills are different and they have different battery connections. In the end I decided to dismantle the battery charger and use the contacts, fitted to the pillar drill, so that I could just remove the battery from the new drill and plug it into the "pillar drill" with the old cordless. (hope that makes sense!).

Just a warning, messing with 12V batteries can be Dangerous. There can be a risk of fire or explosions. Do this project at your own risk and be careful. I only use the drill for small jobs at home and a very short time. Unplug the battery when not in use.

Step 1: Choose Your Drill and Dismantle the Old Battery Charger

Picture of  Choose Your Drill and Dismantle the Old Battery Charger

I chose an old drill with same voltage (18V) as the new drill. I then took the battery charger for the old drill and took it to bits. There is not much inside but I was only interested in the metal clip type contacts.

1. Remove metal clips and simply glue them to a piece of wood / plastic with hot glue. Check the distance by inserting the battery from the new drill. (I had to file the clips a little so that they matched the contacts on the battery from the new drill).

2. Mark the positive and negative connections. You will need to know which is which for the wiring to the drill later.

Great first ible! Waste not, want not
misterxp (author)  ClenseYourPallet1 year ago


Groovy Martin, You have given some old battery tools hope for a new life. Cheers Mate.

misterxp (author)  hippiejuiceman1 year ago
Thanks. I hate throwing things away that work. Pleased you find this useful! Can be applied to other tools too I guess.
Well done Martin!
misterxp (author)  Paoson Woodwork1 year ago

Thanks! and thanks to you for getting me interested in woodwork and instructables!

Nice. I need one of these in my workshop.

Thanks! My first instructable and you are first to comment! Glad you like it.