[Gasification] Mk2 Chip Guillotine

Mark Ludlow mark at ludlow.com
Fri Jan 24 00:11:05 CST 2014

Hi Doug,
Regardless of how we do it, the same work is accomplished. W=F*distance, a
scalar function. But, the instantaneous force required varies according to
the geometry of the opposing force. On a 5cm stick, the first cm will shear
easier than the second, etc. until the maximum diameter is passed through.
Moving to an air cylinder certainly would complicate things while still not
providing the maximum thrust at the right time--halfway through the shearing
cut. Is there no wind, or oxen or other beasts to raise a guillotine to a
trip point? An air cylinder implies first-world power sources and I thought
that that was what we were without.

Best regards, Mark

-----Original Message-----
From: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] On
Behalf Of Doug
Sent: Thursday, January 23, 2014 7:36 PM
To: Discussion of biomass pyrolysis and gasification
Cc: Discussion of biomass cooking stoves
Subject: Re: [Gasification] Mk2 Chip Guillotine

Hi Jason and Colleagues,

Having started this thing, thought I had better try out your idea. I had
reservations about the leverage which proved to be right, as the foot push
ends up taking a lot more effort. The disc blade has to drop 4" and in doing
so, the link point moves out 2". Given time and some $$, I thing the best
solution for the actuation would be an air cylinder with a 5 port valve
control "if" you needed to process large amounts of specifically sized fuel.
Of course you could also use a crank and fly wheel. It's amazing what you
can find quite usable in scrap yards.

Doug Williams,

On Tue, 21 Jan 2014 17:56:55 +1300
Jason <urepedese at gmail.com> wrote:

> Doug,
> would your design objective make it feasible to make that cutter foot 
> operated with a return spring?
> Closest thing I can find with a short search is a foot operated 
> grommet press. http://navyaviation.tpub.com/14218/css/14218_230.htm
> Jason

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