[Gasification] Chip Guillotine was Re: Wood heating in the UK - whole log gasification

Doug Doug.Williams at orcon.net.nz
Sun Dec 29 11:53:17 CST 2013

Hi Jeff and Paul,

It's been a few years since I assembled this concept guillotine design into a drawing, and I emphasis concept. It was to show a principle of slicing the fibres as the force of the blade was applied with as much rotation of the blade possible. How the dimensions are determined can be proven using a cardboard mock-up and leaves plenty of room for innovation relating to the features you mention.

These are the things that I would explore with this concept:

1. The angle of the ground blade, and which direction the angle/s should face the stick to prevent shattering (unless you need this factor).

2. The angle of the blade support plates.

3. The blade diameter.

4. Addition of a bottom blade, possibly to facilitate cutting angles.

5. Blade can be mild steel with welded hard facing, like the Screw Auger Laimet chipper.


As a project, nobody has reported back to me that they have tried to make one, and I have not the time myself to iron out any wrinkles. I will however discuss it today with a mate who might be interested in pottering around to keep his hands busy. Unlike building a gasifier, many on our forums will have plenty of ability to knock it into a working design as an interesting practical project.

I suggest the floor is open to all so we can fatten out the potential details.

Doug Williams,

On Sun, 29 Dec 2013 10:52:11 -0600
Paul Anderson <psanders at ilstu.edu> wrote:

> Doug,     (and I sent this to the Stoves List because fuel preparation 
> is of interests to them also.)
> I too am quite interested in this.   I saw it some years ago when I did 
> not have conditions to proceed.   Now I would like to build one and see 
> it put into action.   Any further info and comments on experiences would 
> be appreciated.
> A major related issue is the feeding of the sticks.   An angled trough 
> with gravity helping the flow down to a "stopper" could help.
> For straight fuels (such as reeds and non-branching shafts such as 
> bamboo and young poplar, pine etc) this could be really a great 
> assist.   The gnarly bifurcating branches of many trees present some 
> difficulties (and opportunities to find solutions!!).
> Paul
> Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
> Email:  psanders at ilstu.edu
> Skype: paultlud      Phone: +1-309-452-7072
> Website:  www.drtlud.com
> On 12/28/2013 7:42 PM, Jeff Davis wrote:
> > Hi Doug
> >
> > I was interested in building your Chip Guillotine:
> > <http://fluidynenz.250x.com/simplechip.htm>
> >
> > And I was wondering if you had anymore insight/advice in regards to this?
> >
> >
> > Happy New Year,
> > Jeff
> >
> >
> >
> > On 12/28/2013 06:05 PM, Doug wrote:
> >> thoughts returned to the rapid growing coppice woods and possibly  
> >> woody stems of many invasive species. With the help of a mate doing 
> >> most of the cutting up, I have coppice Poplar, and Privet hedging 
> >> stems to gasify, with the hope that we can recover more than the 57g 
> >> of char with iron attached from 25kg of "normal" wood blocks.

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