Higher grade polynomial and law curve 1

[FrankP68]

Hi everybody,

I'm curious if anybody can help me with the following problem.

I want to create a law curve or helix that is driven in the Zt direction by a 7th grade polynomial (in attached picture the zt is just defined to have a height of 50 mm).

The 7th grade polynomial looks like: -346440.03*t^7+704560.56*t^6-555866.89*t^5+214712.97*t^4-42523.485*t^3+4276.0711*t^2-320.74256*t+73.858905. When entering the polynomial for Zt, NX prompts an error

Does anybody know how to create this curve?

Next I want to cut out along this law curve, see 2nd picture where I used a constant pitch just to get an example.

Thanks in advance.

 

[Ehaviv]

Try putting the coefficients in parenthesis

Maybe it's confusing the system

 

[cowski]

In the expressions dialog, the t parameter needs to be created as a number:constant type variable rather than a number:length type variable. As it is written now, the system is trying to add a value with mm^7 units with a value with mm^6 units (+ mm^5 + mm^4 etc) and it can't add them because the units do not match.

www.nxjournaling.com

 

[FrankP68]

Hi Cowski,

Thanks a lot, that little change in variable type worked fine. Now the helix follows nicely the higher order polynomial.