Re: [CAD_CAM_EDM_DRO] How Would You Design question

I assume that you are cutting along the 37" side.

I have seen a roller chain drive used for sheet saws before. Fast enough
and fairly cheap. You would probably want to clamp your stock to a carriage
that moved along a fence that clamped to your saw table. Unistrut would be
accurate enough and is inexpensive.

Will a table saw really do what you want? Most resaw operations are done on
band saws as the thinner kerf does not waste as much material. Kerf width
stability as the blade heats up can be an issue with table saws as well.


At 10:56 AM 4/24/02 -0600, you 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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