a working chainsaw based on the one used by Jeeves of the Tremor Brothers in Smokin' Aces
About this creation
NEW: to see a vid of me showing what this thing can do, click here
Watching Smokin' Aces about a week ago, i decided that my favourite characters were the Tremor Brothers, a trio of half-brother hitmen who brutally murder anyone who gets between them and their target. Lester, the short one, utilises a sawn off double-barrel shotgun, while hisbrother Darwin makes use of a sten gun and two machettes. The credit for madness, though, has to go to the biggest of the three, Jeeves. he causes mayhem using his automatic shotgun and chainsaw. pity he fell on it while it was still revving.
Anyway, i suddenly had the urge to build a chainsaw. after trawling the web for a while, i realised that no-one actually knew what chainsaw he used, so i just made a big black (and red) one.
The chainsaw took a day to build, and uses two NXT servo motors, both powered by 18v coming from a pair of 9v battery packs (ill show you how to set this up later). there is a safety switch that turns the battery packs on, and the wires pass through a multi-directional switch that is connected to the trigger (i only used off and forwards, the machine isn't rigged to go backwards), and then it goes to the two motors on either side of the back of the chain attachment. the chain has 86 links, and the patern of red teeth is as shown in the pics, but there is a point where the side with the teeth doesn't alternate, this had to happen as 86 isn't divisible by 4.
the 18v and two motors really help - it does a rev of the chain in under 1.5s!
Its pretty simple to use: flick the safety switch to "on", then pull the trigger on the rear grip. not rocket science.
The pics (there isn't one of it moving as my camera has such a short exposure that it looked like it wassnt moving when i took the pic): another pic of it
how to hold it (pretty obvious)
side view of main body
random 3D angle
trigger/polarity switch setup (sorry you cant see much)
Safety switch, transformer (at the back) and battery packs detached, showing the safety switch safe and ready(respectively)
I detached it for these pics, hopfully you can see what yu need to do to make it.
note: lego motors are so well made that they can easily take 18v without any problems.
the transformer uses 5 2x2 9v system cables, including the ones to connect to the inputs and the output. credit goes to the book of forbidden lego, who had the idea of the 18 v system, i just tweaked the design so that it didn't have to sit directly on top of two battery packs side by side.
Hope that helps. the dotted lines show the different wires and where they go.
And one last look at the chainsaw
Hope you liked it! tell me how i can improve it ;)
One way you could improve it although it would be complicated would be to use the technic chain that you can get with the technic motorbike. 2 chain links = 1 caterpillar link. you get 40 links with the motorbike.