Calculated Functions?

[pyrodenis]

Is there a way to place a command in a file that increases Proportion Z, as the distance in X increases?

[Gary Campbell]

In one move such as an "M3" move or to have z increase proportionally as X is positioned in the positive direction?

[pyrodenis]

Yes. In fact, I'd like to use a file that I enter a Proportion X as well.

[Gary Campbell]

I believe you can add proportion in the "FP" fill in sheet (or in an "FP" command. It may not pop up by default, and I forgot how to toggle it back on, but there is a way.

[pyrodenis]

Thanks for your time Gary, but I must not have explained the challenge condition adequately. I need proportion Z to be dynamic, as X increases and decreases during the cutting. It would be using a function to accomplish what simple shimming would. Shimming is not practical in my case.
I am crowning deck boards. I'll give a few other details, for those interested. I'm using Kentucky Coffee wood, the edges are undercut 7degrees (except at joist locations), and hidden fastening with biscuit joiner. The underside has flutes for stress relief and circular holes cut with dovetail bit to receive nova chuck jaws, which are bolted to my Powerstick at 24" centers. I'm using a 2.25" dia, 1.75"r Amana Crown bit, as a "bullnose". I have a Bosch GCL 2-160 laser level mounted to the side of my spindle, which helps with alignment.
The agonizingly slow process: (I can't believe my wife is still speaking to me, after a summer with no deck!)
Each board (4.75" finish width) is crowned 1/8" on center in its width, with 1/16" radius edges. I created a 3D model in Aspire and running raster X with the crown in Y direction. I made my X length 10", and enter a Proportion X for the various lengths of the boards. (Proportion X = 9.6; X=96")
Because I can't resist torturing myself (and my wife), some of the boards are 12' long. But, max Powerstick is 8'. So, I have to flip boards end for a second run. My challenge is reconciling Z height. For some boards, I need Proportion Z = 1.0 at one end of the new cut, and Proportion Z = 1.xx at the other end.
So, is there a function that will dynamically adjust Proportion Z, using the X as the multiplier/variable?
Thanks,
Denis