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Pocket Chainsaw

gb Offline Broog

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Pocket Chainsaw
on: June 22, 2022, 04:23:03 PM
Ever i since i saw that scene in Hot Dots part deaux where Charlie Sheen playing a Rambo type character gets his parachute caught in a tree and he whips out his Rambo survival knife only to pull on the little starter cord to start up the lchainsaw built into the blade, my inner child has wanted something like it (what I'd use it for i have no idea.... but I want one... a bit like the James Bond wrist mounted dart gun). I love making stuff, but the prospect of making a reliable mini chainsaw has always been out of reach but recently came across these little 'nano-blades' by Bosch .... recon something neat can be done with these little buggers :-) :D

* NANO-BLADES.jpg (Filesize: 169.71 KB)


00 Offline Dutch_Tooler

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Re: Pocket Chainsaw
Reply #1 on: June 22, 2022, 06:29:13 PM
Cheers!
Dutch_Tooler

Location: Southern Germany, most of the time


gb Offline Tasky

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Re: Pocket Chainsaw
Reply #2 on: June 22, 2022, 09:52:39 PM
This thread is the start of something beautiful.......!!
I can't offer much in the way of engineering advice, but I recall playing with LEGO Technics and using a motorised worm gear on a very small cogwheel for higher speeds with a smaller gearbox - Might be some merit in that idea?


00 Offline Dutch_Tooler

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Re: Pocket Chainsaw
Reply #3 on: June 23, 2022, 09:21:15 AM
As for engineering details, I believe I remember reading that Bosch had/s some issues with the cheaper EasyCut models of the chainsaw due to the required 90° rotation axis conversion between motor output shaft and blade input sprocket (as in the sketch above); worm drives could be an alternative idea, but are much less durable unless you apply copious lubrication, which you'd want to avoid in a hand tool. There is a mechanically sounder AdvancedCut version of the Bosch saw with all of it inline, the downside being the motor and its casing protruding from the side, i.e. less compact. I have the latter - it weighs in at 0.7 kg or 1.5 lbs. 

For all I think this is a brilliant design, I think that for a tool the size shown in the sketch, combined with realistic endurance and power, we'll need to see some further advances both in motor and in battery technology...
Cheers!
Dutch_Tooler

Location: Southern Germany, most of the time


gb Offline Broog

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Re: Pocket Chainsaw
Reply #4 on: June 23, 2022, 10:12:00 AM
Great advice chaps .... i think you're right with regards to batteries and gearing .... I'll still have a play around and see what I can come up with. Even if the durability isn't that great it would still be awesome to be able to whip out a little chainsaw for simple silly jobs, just to see the looks on people's faces. i did buy an easy cut 12 for my dad for father's day so at least i can take some measurements off that .... then I'll start buying and evolving the design.
Might take a while since I always have several projects on the go ... currently I have titanium multitools and gear which is a permanent work in progress, giant modular survival knife, conversion kit to add kayaksailor rig to inflatable kayakat, garmin watch strap mods and I'm also designing a Jumanji style treasure hunting game for my nieces for when they come and visit later this year   ......  I'll be post all the gadget related stuff on other threads as soon as I can. :multi:
« Last Edit: June 23, 2022, 10:19:01 AM by Broog »


gb Offline Tasky

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Re: Pocket Chainsaw
Reply #5 on: June 23, 2022, 12:28:28 PM
Broog, you are Colin Furze and I claim my £5....!! :D


gb Offline Broog

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Re: Pocket Chainsaw
Reply #6 on: June 23, 2022, 01:04:55 PM
Colin Furze..... just had to look him up .... Ha Ha ... I wish I had his budget ... my most elaborate hobby project so far has been the all titanium Multi tool which I pretty much designed from scratch (evolved from modding a SOG powerpint) but I'm always tinkering with something. I'm an engineer by trade ...... I did the concept engineering for the Project Victor (image attached) and currently working on Aston Martin Valkyrie.

* Victor.jpg (Filesize: 114.16 KB)


gb Offline Broog

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Re: Pocket Chainsaw
Reply #7 on: June 23, 2022, 01:07:28 PM
This is my titanium multitool (with a bit of carbon) .... will start a separate thread for this thing since I've also designed some accessories around this and the whole journey gave me quite a bit of learning.

* pliers.jpg (Filesize: 215.96 KB)


00 Offline Dutch_Tooler

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Re: Pocket Chainsaw
Reply #8 on: June 23, 2022, 02:21:46 PM
 :o I like what I see (the Aston Martin too BTW)
Cheers!
Dutch_Tooler

Location: Southern Germany, most of the time


us Offline OldBoy2016

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Re: Pocket Chainsaw
Reply #9 on: June 23, 2022, 03:35:11 PM
I bow down to you. That tool looks great.

Do you drive the Aston? That’s like my dream car. What’s it like?


gb Offline Broog

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Re: Pocket Chainsaw
Reply #10 on: June 23, 2022, 06:57:18 PM
Thanks Oldboy, much appreciated on the multitool. No I never got to drive the car…. It was a one-off based on a One-77 but with improved airflow, downforce and cooling, and with bespoke suspension and exhaust system based on the Vulcan track car…… I think it sold for over £4million.


us Offline OldBoy2016

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Re: Pocket Chainsaw
Reply #11 on: June 23, 2022, 08:12:39 PM
Hah! Chump change. One can only dream.  Still you got to be part of something cool.


au Offline ReamerPunch

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Re: Pocket Chainsaw
Reply #12 on: June 25, 2022, 06:29:10 AM
Awesome ideas and designs all around! just amazing!

Can we have more pics of that multi-tool please?  :drool:


us Offline King_Gorilla

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Re: Pocket Chainsaw
Reply #13 on: July 19, 2022, 02:34:04 AM
pocket chainsaw.   yes.   :popcorn:  That needs to happen.


pt Offline pfrsantos

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Re: Pocket Chainsaw
Reply #14 on: July 19, 2022, 11:00:43 AM
pocket chainsaw.   yes.   :popcorn:  That needs to happen.

Yeah, just having a zipper near my privy bits to test fate is not enough...

 :facepalm:
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us Offline King_Gorilla

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Re: Pocket Chainsaw
Reply #15 on: July 21, 2022, 12:01:51 AM
Yeah, just having a zipper near my privy bits to test fate is not enough...

 :facepalm:

Yikes  :( :-\   I had not thought about that...    :think:


 

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