How to draw a logarithmic spiral

[Anonymous]

I'm trying to draw a logarithmic spiral using the equation curve button.

The equation of the curve i need to input is r(t): 2.718281828^(0.24*t)

Theta (t) can just be set to = t

I'm using Parametric and polar coordinates.

as soon as i do any function with ^t the text goes red. i think it's because it is getting unexpected units, but i dont know how to fix this...

I'm running 2015 

[Anonymous]

I'm trying to draw a logarithmic spiral using the equation curve button.

The equation of the curve i need to input is r(t): 2.718281828^(0.24*t)

Theta (t) can just be set to = t

I'm using Parametric and polar coordinates.

as soon as i do any function with ^t the text goes red. i think it's because it is getting unexpected units, but i dont know how to fix this...

I'm running 2015 

[swalton]

Inventor is unit-aware.  You will need to make sure that your equation produces the units that the parameter is expecting.  Sometimes I will do an unit analysis of the equation before I input it into Inventor.

For example, say r(t) is in inches and "t" is in radians.  Use an equation something like this:

r(t): (2.718281828 in)^(0.24*t/(1 radian)) 

[swalton]

Inventor is unit-aware.  You will need to make sure that your equation produces the units that the parameter is expecting.  Sometimes I will do an unit analysis of the equation before I input it into Inventor.

For example, say r(t) is in inches and "t" is in radians.  Use an equation something like this:

r(t): (2.718281828 in)^(0.24*t/(1 radian)) 

[Anonymous]

yes, that's what i thought, but it still doesn't work.

Does it work on your machine?

[Anonymous]

yes, that's what i thought, but it still doesn't work.

Does it work on your machine?

[johnsonshiue]

Hi! Unfortunately, Inventor equation does not support logarithmic equations like this (variable in power).

Many thanks!

[johnsonshiue]

Hi! Unfortunately, Inventor equation does not support logarithmic equations like this (variable in power).

Many thanks!