Helix that gets less tight as it spirals in toward center.

[plutoniumsalmon]

Hello.

I was wondering if someone could talk me through creating a spiral that gets less tight as it moves towards the center. I want to create a part where a ball endmill would progressively go down in z towards the center as it spirals in while maintaining the same spacing in the cusps between its passes. For this I need to create spiral that grows. Thank you

 

[JohnRBaker]

If you can write an equation to describe the path, that equation can be used to define what they call a 'Law Curve', that is a curve driven by a formula. So, look for 'Law Curves'.

John R. Baker, P.E. (ret)
Irvine, CA
Siemens PLM:

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It's finding someone you can't live without

 

[plutoniumsalmon]

The equation is going to be a problem. I am terrible at this. I will try

 

[Bleaker]

You can try the Helix command first, it might cover some basic cases (such as linear size and cubic pitch rules) without needing to resort to a formula.

 

[Toost]

NX has "Trochoidal cutting", doesn't this do what you are looking for ?
Else, can you explain in detail how that helix should be ?
should it be conical and vary in pitch ?
I think ? this is the engage we are talking about ?

Regards,
Tomas

The more you know about a subject, the more you know how little you know about that subject.