Re: [CAD_CAM_EDM_DRO] How Would You Design question

Afraid for what I am scheming the radial type blade is a requirement. While
a "plane" arrangement could be made to yield material that was the proper
thickness the planning action tends to damage the structure of the wood and
does not yield the proper surface finish.

It is true that for this type of resawing operation a bandsaw is more
common. After bandsawing the resulting sheets require sanding or planning to
eliminate the band saw marks. Both of these operation will not yield the
correct finish or properties. The circular type blade is the only way to go
for this specific application.

Tim
[Denver, CO]

----- Original Message -----
From: "Peter" <prenolds@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, April 24, 2002 3:09 PM
Subject: Re: [CAD_CAM_EDM_DRO] How Would You Design question


> Tim,
>
> Would it also be worth considering a "plane" arrangement where you
> eliminate the saw completely and basically just pass a 4"(actually a bit
> wider than your maximum work block) wide plane blade over the block.
> The blade would need to be rigidly mounted and on rails - kind of like a
> railway bogey which has a software controlled height control.
>
> I'm sure this would work at the .050" thicknesses but would probably
> fail at .200" due to the thickness of the blade. If it could be made to
> work - you would get a lot more yield from a block and no sawdust...
> Obviously the blade would have to be rigidly mounted.
>
> Cheers, Peter
>
> Tim Goldstein wrote:
>
> > Been thinking about creating a specific purpose CNC machine and thought
it
> > would be help to see how some of you would attack the problem. The
question
> > revolves complete around the mechanical design of the equipment and does
not
> > at all consider the electrical or software from the motors to the
computer.
> >
> > Here are the design parameters:
> > 1) The machine will be single purpose to cut sheets of wood off of
blocks
> > with a maximum dimension of 3" x 4" x 37"
> > 2) The resulting sheets need to be consistent in thickness over the
lenght
> > of the sheet + - .0025
> > 3) The thinnest sheets cut will be .050" and the thickest will be .200"
> > 4) The cutting motion travel will need to be in the speed range of 20 -
60
> > ipm with a rapid backfeed in the 200+ ipm range.
> > 5) The actual cutting equipment will be a high end table saw with very
good
> > bearings so that the spindle rigidity, run out, etc do not need to be
part
> > of the design discussion
> > 6) The designed mechinism has to fit on and be compatable with a high
> > quality table saw
> > 7) The mechanical portion of the design (not including motors, the base
saw,
> > electronics, or software) should be able to be constructed for about
$500
> > 8) Specifying expensive components that are commonly able to be found in
the
> > surplus market to meet the cost goal of #7 is acceptable.
> >
> > I think that pretty well lays out the general requirements I am trying
to
> > meet. Look forward to the various ideas that everyone may have on how to
> > accomplish this. I have some ideas in mind and it will be interesting to
see
> > if they are consistent with the group consenses.
> >
> > Tim
> > [Denver, CO]
> > http://www.KTMarketing.com/CNC.html
> >
> >
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> >
> >
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> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this as a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
>
>
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