Introduction: How to Build a Lego(R) Chainsaw

Having seen a 'chainsaw' instructable which was not a chainsaw, I started thinking. I had some Lego bits, including:

A motor (4.5v)
Some gear wheels
Some chain links
And some other general bits.

These parts are required, as pictured.

The tricky part was the saw teeth...

Step 1: Saw Teeth

These are the most tricky part, which is why I started on them first.

If you examine Lego chain-links, you will see that they interlock with pins spaced 6.5mm apart. There's enough clearence to get something very thin between the joints to be fixed on the same pins:

Aluminium beer-can, easily cut with scissors & sharp knives (do be careful).

Tools:
A hammer
A knife blade
A piece of stiff wire (from an umbrella)
A picture nail
An abrasive stick (coarse corundum, probably)
A piece of wood

Please view the pictures for the method.

Step 2: Fitting the Teeth

It's best that you work this out as you do this.
Mount one tooth on one pin of a chain link, and secure it by clipping another link over the top.
Then mount the other hole on the tooth on a third link, and clip it to the first, securing the tooth.
(If anyone gets this far, and I doubt it, they'll work it out)

Step 3: And the Rest

I'm not going into details, this part is relatively easy.
The pictures should give you enough information.
I started with a direct-drive from the motor pinion, but later geared-down (intro picture). However, direct-drive off the motor works best.

Step 4: Action

Some paper was shredded, but there was some slippage where the steel motor-shaft should grip the black plastic pinion.
Weedy, but concept proven.

Some glue on the motor pinion and this was pretty effective on broccoli.
Success!

Comments

author
incorrigible packrat made it! (author)2008-03-22

Groovy! Now make a Lego Ash and a Lego Deadite, for him to carve up.

author
ALogan97 made it! (author)ALogan972011-07-17

That would be awesome! especially if they were made autonomous using lego mindstorms.

author
sharlston made it! (author)2009-10-29

great ible lemonie

author
lemonie made it! (author)lemonie2009-10-29

Took you a while to find it! (where's this ball-mill you were going to do?)

L

author
sharlston made it! (author)sharlston2009-10-30

its oing to be delayed as i was tublining stones and i didnt clear out the silicon carbide very good so it set in the bottom but ill clean it now somehow

author
lemonie made it! (author)lemonie2009-10-30

It's clagged-up with silicon-carbide? Post a question, that'd be an original one.

L

author
sharlston made it! (author)sharlston2009-10-31

well its dry now so ill probaly be able to chisel it out

author
sharlston made it! (author)sharlston2010-11-27

Old thread but i ended up scrapping all designs and proto types as it made hella lot of noise so i had to run it outside in the shed,there was a leak in the roof and it messed up the motor

author
X_D_3_M_1 made it! (author)2007-11-25

..

kill u.jpg
author

whoa... thats... creepy...

author
bounty1012 made it! (author)bounty10122009-05-11

Doctor Salvatore!

author
Kaiven made it! (author)Kaiven2008-09-30

LOL.... That looks familiar.... Where is that from?

author
Flashdude made it! (author)Flashdude2008-11-20

uhh... resident evil, if i'm not mistaken.

author
assassin1321 made it! (author)assassin13212008-12-05

resident evil 4 in chapter 1 and 2

author
paperairplanecreator made it! (author)2010-08-19

dang i thought that metal was paper...

author
lexioux made it! (author)2010-08-11

hehe, Auto Emo. So have to make one, its perfect for todays Emo on the go.

author
lemonie made it! (author)lemonie2010-08-12

i never thought of that...

L

author
Kush_Slayer made it! (author)2009-07-21

well this looks safe lol

author
xerxesx20 made it! (author)2009-05-06

Haha love it. The fact it works on broccoli is just an added bonus! Another miraculous and semi-useful/very useful 'ible. :-)

author
ShampooRobot made it! (author)2008-10-03

I want video!!

author
andrew13 made it! (author)2008-06-22

and, the point of this?

author
Kaiven made it! (author)Kaiven2008-09-30

TO RULE THE LEGO WORLD!!!!!!!

author
LePyro made it! (author)2008-08-09

now all you you have to do is to attach it to a inch lego rifle and you'll have the worlds smallest lancer!! XD

author
Esmagamus made it! (author)2008-06-17

Now you've got to make all the heavy stuff. And that includes Lego dynamite!

author
llama lord made it! (author)2007-12-28

ah, lemonie, you never fail to astound. {insert heavy sigh)

author
Rodancoci made it! (author)2007-08-27

Hey, I'm kinda new in Instructables, (though I've made a lot of them) Well, anyway, do you know those cardboard cutters? Could you make the teeht out of them? Just asking.

author
lemonie made it! (author)lemonie2007-08-27

You have to make holes in the teeth. It's easy with aluminium, but you'd probably need a drill for steel. Also, there have to be very thin to fit the chain-links in this way - steel blades (other thank razor) would be too thick. L

author
Rodancoci made it! (author)Rodancoci2007-08-27

Oh, OK.

author
Rodancoci made it! (author)Rodancoci2007-08-27

Is the engine a Technic engine?

author
lemonie made it! (author)lemonie2007-08-28

Yes it's an old (and feeble) 4.5V Technic motor. I drove it a bit above 4.5V, but I don't know how much these will take(?) L

author
Punkguyta made it! (author)2007-07-30

Auto-Emo, now all the work is taken out of attention seeking!

author
Punkguyta made it! (author)Punkguyta2007-07-30

Also, any thoughts of making it usb compatible with built in plug and "slay"? 5 volts is enough to run that eh?

author
lemonie made it! (author)lemonie2007-07-31

Now there's a thought (4.5V motor). I do have a spare USB cable, so maybe... L

author
Neo1 made it! (author)2007-07-12

does it use batteries or an external power?

author
lemonie made it! (author)lemonie2007-07-12

Either. But I used an mains-powered variable DC supply L

author
Ben.land101 made it! (author)2007-06-18

this would probably work on wood if you were to make the chain and motor stronger. and one question. does this thing hurt your finger if you touch it while its turned on? just curious

author
lemonie made it! (author)lemonie2007-06-19

Well, I haven't tried that. Maybe I'll seek out a volunteer and post the results... L

author
Ben.land101 made it! (author)Ben.land1012007-06-19

ok that sounds good

author
stevoIution made it! (author)2007-05-21

Hahaha, what better to test a mini chainsaw than a mini tree(broccoli) I do remember that other crappy chainsaw "instructable" and this sh!ts all over it.

author
lemonie made it! (author)2007-05-15

No, but they don't have enough power behind them to bend. Bigger motor and maybe. L

author
Mace42 made it! (author)2007-05-14

that thing is so cool (i think im obsessed)

author
rmccue made it! (author)2007-05-14

Awesome. Did the teeth ever bend?

author
Mace42 made it! (author)2007-05-10

sweet. i want one!

author
Mad Cat made it! (author)2007-04-17

Ouch! Imagine...a Lego Mindstorms robot with a chainsaw that chases after you. Of course, it would need a clown mask to make it more evil.

author
lemonie made it! (author)lemonie2007-04-17

I just did imagine that, it was great (thanks) L

author
potbellypiglord made it! (author)2007-03-21

That is the coolest lego thing i have ever seen!

author
Brian Henderson made it! (author)2007-03-12

That's a really funny Instructable. I like it - great job!

author
hack124x768 made it! (author)2007-03-11

Was the broccoli steamed, boiled, or raw? I would thing that boiled would just fall apart anyway, whereas raw is still pretty tough.

author
lemonie made it! (author)lemonie2007-03-11

Raw, it's still in the fridge. Given that I've already got bits of green and juice on the thing, I anticipate a mess with mushy-veg.

author
Jack Daniels made it! (author)2007-03-11

i would just like to point out that you could do 2 other things here. A) use several of those razorblades instead of making a blade B) some Real chainsaws have small enough teeth that you could use them this would be a great servivle tool if build well enough

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Bio: I'm an experimentalist, a scientist and I have a tendency to do things just for the sake of doing them, or to find out ... More »
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