How to create a spiral in Inventor with a variable pitch

[jwillieinventor]

Hello All,

I am having difficulties creating a spiral with vairable pitch using sweeping or the coil function in inventor. I am told that the Equation Curve option works but i do not know the equation for this spiral. What I have is the the length/height of each segment that makes up the spiral and the pitch of the spiral. In addition, i have the profile coordinates in (x,y) in excel.

Does anyone know how I can go about this?

Thanks!

Jimmy

[CCarreiras]

Hi!

Place the files and we will give it a try...

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[brendan.henderson]

This might help.

http://cadprosystems.blogspot.com.au/2011/11/variable-pitch-auger-creation.html