[Gasification] [Stoves] Chip Guillotine

Doug Doug.Williams at orcon.net.nz
Wed Jan 1 13:35:50 CST 2014

Hi all interested in this project challenge.

I appreciate the comments and suggestions offered so far, and it has already changed my original ideas. The cardboard model and chip stick size shows that an 8" (200mm) disc is probably more practical, and a curved bottom blade would imitate the action of lopper shears.

It is important for all interested to remember, that these should be manufacturable in the basic workshops found in developing countries, or any rural place with limited facilities. No doubt they could be made in China, but that isn't always the best option for rural economies to bootstrap themselves. 
Seed money in the right places can do wonders, just like making stoves has achieved.

With a bit of luck, I should have a working prototype by the end of next week, but holiday time in New Zealand is the time for wrenched backs, shoulders knees and ankles, so applying emergency treatments in the clinic keeps me out of the workshop (:-(

Happy New Year folks.
Doug Williams,

> >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.
> We have chippers that use disc blades:
> http://www.greenmech.co.uk/greenmech-disc-blades/
> They are definitely not supposed to rotate in use but easy enough to
> mount so they do, the diameter is much smaller than your design at
> 100mm (4") diameter but they may make a simple entry for a 1/3
> dimension proof of concept.
> I have several but the postage may be prohibitive or I can ask a
> machine shop here to assemble something given a few more dimensions.

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