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Logarithmic Spiral (#3735)
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blowlamp  
#1 Posted : Saturday, April 23, 2011 4:28:52 PM(UTC)
blowlamp

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I'd like to see this option added to allow spirals (and helices if possible) of a constantly changing pitch.
Also, please make the current spirals terminate at their centre point.


Martin.
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jlm  
#2 Posted : Saturday, April 30, 2011 12:50:36 PM(UTC)
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I support Martin"s request.
In spring time...
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zumer  
#3 Posted : Sunday, May 1, 2011 1:07:36 AM(UTC)
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The data fields evaluate functions, it should already be doable. Through parametric .spl import too, I'd guess.
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blowlamp  
#4 Posted : Sunday, May 1, 2011 4:32:30 AM(UTC)
blowlamp

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Originally Posted by: zumer Go to Quoted Post
The data fields evaluate functions, it should already be doable. Through parametric .spl import too, I'd guess.


Hi zumer.
The more I use ViaCAD the more I find it's hidden powers, so I bet it can be done, but unfortunately my maths skills aren't up to much and I thought that a slide-bar plus a data-entry field would be the way to go to alter the rate of change of the pitch.

Here's a pic of what I'd like, for those that didn't realise they'd already seen one.

Martin.
blowlamp attached the following image(s):
Logarithmic_spiral.png (61kb) downloaded 4 time(s).

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billbedford  
#5 Posted : Monday, May 2, 2011 2:04:57 AM(UTC)
billbedford

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You can do it already, just import a suitable spline file. The tutorial is [URL="http://www.csi-concepts.com/Demo/tutorials/ImportingSplinesTutorial.pdf"]here[/URL]
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blowlamp  
#6 Posted : Monday, May 2, 2011 5:16:52 AM(UTC)
blowlamp

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Originally Posted by: billbedford Go to Quoted Post
You can do it already, just import a suitable spline file. The tutorial is [URL="http://www.csi-concepts.com/Demo/tutorials/ImportingSplinesTutorial.pdf"]here[/URL]


Hi Bill.
I was hoping the feature could be added to VC and Shark to produce these curves, without us having to resort to doing the maths, or importing from other programs.

Martin.
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lebeau  
#7 Posted : Friday, May 6, 2011 6:48:57 PM(UTC)
lebeau

Rank: Member

Joined: 2/21/2007(UTC)
Posts: 47
Here is an excel spreadsheet someone shared with me to create log spirals. You have to play around with importing into Shark/via cad. I can't remember the exact steps but it was very successful.

You enter the angle and it changes the spiral.

Mark
File Attachment(s):
spirals.xls.zip (5kb) downloaded 7 time(s).

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