Dear Paul
The request is like the question: "How long is a piece of string"? :-) There
are many different potential chaff cutter and wood chopper designs. There are
as many as there are "potential applications."
Some of the variables may include:
* Production rate required.
* Manual or machine power
* Feed material
* Desired "cut product size and shape.
* Need for screening and sizing of product or not?
* Portability
* Durability
* Potential annual sales for each specific product
* Permissible price for a product or specific device to accomplish a specific
task
* Etc.
These variables, and the "necessary features" required, must be specified
before it is possible to configure a suitable design and to estimate a cost "at
the factory gate."
So, if you required a "cutter" or "chopper" to make a fuel suitable for TLUD's,
you should specify all the relevant properties and features that would be
necessary for a Designer to configure a product design that would meet your
needs. However, the Designer should know how much the Customer could afford to
pay for the final product, so that he will know if it is even possible to build
a product that will be affordable to the Target Customer. Additionally, the
Designer needs to know the expected sales volume per year, so that he can
figure in the economies of scale in developing prices.
Best wishes,
Kevin
----- Original Message -----
From: Paul Anderson
To: Mark Ludlow ; [email protected] ; 'energiesnaturals' ; 'Discussion
of biomass cooking stoves' ; 'Bob Fairchild' ; 'Ron Vanetten'
Sent: Saturday, January 04, 2014 4:07 PM
Subject: Re: [biochar] Re: [Stoves] Chaff cutters and wood choppers
Mark,
I am not good at estimating price points, and the number of variations
(feeder rollers, flywheel, thickness of sticks) are so numerous that to say a
price without specifying all the rest might not be very realistic. So, as a
NON-engineer, I request assistance from other readers about price vs features.
Even if I purchased one for where I live (Illinois, USA), my usage would be
limited, and not related to amounts like tons. And to export from Mexico to
Africa would be in the same league as importing cutters from India, meaning:
difficult.
I would like to know what could be accomplished at different price points.
Is that a reasonable place to start? (I hope others will comment. And maybe
something can be accomplished.)
Mark, where are you in Mexico, and when did you move there? Greetings to
your wife.
Paul
Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: [email protected]
Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.comOn 1/4/2014 2:23 AM, Mark Ludlow wrote:
Hi Paul,
It would be useful if you could state a price point that would make
equipment like this realistic. The machine Rolf describes is typical, but I
appreciate the fact that limbs and trunks are fed at an angle. Shearing at an
angle reduces the shear force required and thus increases the output per unit
of power input. I could build a no-frills (except for safety systems) chipper
like the one Rolf describes, here in México, at cost, if you are interested.
México is the productivity-adjusted, lowest-cost producer in the world, as of
2014. Yet many are unemployed.
If you tell me some number, say $/MT of green input, this gives us a target
to design against. I think that energy-storage (flywheel) to accommodate
impulse loading may work, but the amount of energy required is easily
calculated and is reflected in the nominal hourly-input rating.
I will support development costs (as a non-profit) if you will tell me
there is a market for XXX Machines at XXX Cost on the horizon.
Buen Viajo en Africa!
Mark
From: [email protected] [mailto:[email protected]] On Behalf Of
Paul Anderson
Sent: Friday, January 03, 2014 11:29 PM
To: energiesnaturals; Discussion of biomass cooking stoves; Bob Fairchild;
Ron Vanetten; [email protected]
Subject: [biochar] Re: [Stoves] Chaff cutters and wood choppers
Rolf, Crispin and all,
Very good reports.
It would be very nice to have a summary of the manufacturers and models
(with price and cutting attributes).
ASSUMING that some one or a few of these devices (and not toooo expensive)
can do the stick and small branch cutting, we need to get some of them into
action in places where we can use the fuel for the stoves.
Any assistance to accomplish this would be appreciated.
Paul
Doc / Dr TLUD / Prof. Paul S. Anderson, PhD Email: [email protected]
Skype: paultlud Phone: +1-309-452-7072Website: www.drtlud.comOn 1/3/2014
1:19 AM, energiesnaturals wrote:
The Jensen Buschhacker is a kind of disc chopper wth only 1 blade
sopported in front of the actual disc and thus free to let up to 12 cm enter
the space between fixed counter knife and the rotating blade. The wood enters
horizontally, but at that 30 or so angle to the disc's plane. The cutting
length is given by the speed of the advance rollers/cylinders vs. the
rotational speed of the disc as usual.
These devices are no toys, the biggest of them cut nearly 20 cm of oak
branches!
My 60 y.o.Buschhacker munches through 15 cm of softwood and 12 cm of
extremely hard dry GREENOAK (quercus ilex) and wild olive. And this is the
middle model of 3.
Of course you wouldnn't want to lift these branches high up to insert
them into a garden chipper type, thus the horizontal cutting angle.There must
be a series of photos on the bioenergy list somewhere, but i cannot find it
from where i am right now.
Rolf
Enviado desde Samsung tablet
CPP GMail <[email protected]> escribió:
When the blade impacts the wood/branches are they pointed downwards? That
would tend to pull the feedstock in as well as provide the bevel cutting
effect.
Thanks
Crispin
--------------------------------------------------------------------------
From: "energiesnaturals" <[email protected]>
To: "[email protected]" <[email protected]>
Sent: 3 January, 2014 12:54 AM
Subject: Re: [Stoves] Chaff cutters and wood choppers
Nail trimmers indeed, but only if you intend it.I have worked with them
time ago and as long as you put the alfalfa/hay/straw right on the conveyor
chain and let the advance cylinder in front of the cutting wheel do it's job,
there is not much danger to get caught...
Btw, they still build them in Spain as i inquired for Christa some month
ago.
The same principle applies to the Jensen Buschhacker i described earlier.
Not only has it 35deg angle between advance rollers and disc plane, but
the blade position in the disc cuts much like you would cut through aloaf of
bread with a knife.
This enables the Jensen to perform very well with only 12-15 hp tractors
on the pto.
My Laimet Hp 21 also saves energy cutting, but we strongly miss the
advance rollers.
We are actually busy implementing them together with a pickup system for
prunings and forest slash for the Laimet and two modern Jensens.
Guess for what!
Rolf
Enviado desde Samsung tablet
[email protected] escribió:
The one at the link above is really advanced
when it comes to safety which is good
because this sort of machine was responsible for more lost fingers
than any other piece of farm equipment.
Impressive piece of machinery and EXACTLY my immediate reaction--- Nail
trimmer extreme!!!
M Trevor
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