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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.
jlm  
#2 Posted : Saturday, April 30, 2011 12:50:36 PM(UTC)
jlm

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I support Martin"s request.
In spring time...
zumer  
#3 Posted : Sunday, May 1, 2011 1:07:36 AM(UTC)
zumer

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The data fields evaluate functions, it should already be doable. Through parametric .spl import too, I'd guess.
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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Joined: 2/19/2007(UTC)
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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]
blowlamp  
#6 Posted : Monday, May 2, 2011 5:16:52 AM(UTC)
blowlamp

Rank: Senior Member

Joined: 6/28/2008(UTC)
Posts: 648

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.
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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