Jeff, Andrew etal:

   1.  I vaguely recall this subject coming up 10 or more years ago, with the 
conclusion that a tool called a "bypass lopper" beat saws.  This Amazon ad

http://www.amazon.com/True-Temper-Pruning-Solutions-2342530/dp/B000EM2SSQ/ref=pd_bxgy_lg_text_y

shows at least 3 companies producing tools that seem to be about $15 per inch 
of wood material to be sliced (1.5 up to 3 inch).  Mainly designed for use in 
the field, but clamping on a bench should be fairly easy for many, and it might 
do double duty.

   2.  I really know nothing on this topic - just repeating earlier dialog.

Ron



On Dec 31, 2013, at 7:23 PM, Jeff Davis <[email protected]> wrote:

> Hi AJH,
> 
> Don't bother sending me anything. In time I'll find something and if need be 
> I'll just flame cut a disc from flat plate. I checked out one of our local 
> farm supply places looking for a flat disk blade but now that it's winter all 
> of those types of things are gone or put away. Impossible to find anything 
> outside with all this white stuff on the ground. Looks like I have enough 
> scrap for the frame.
> 
> 
> Jeff
> 
> 
> On 12/31/2013 06:46 AM, [email protected] wrote:
>> [Default] On Mon, 30 Dec 2013 06:53:17 +1300,Doug
>> <[email protected]> wrote:
>> 
>>> 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.
>> 
>> AJH
>> 
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