logo
NOTICE:  This is the new PunchCAD forum. You should have received an email with your new password around August 27, 2014. If you did not, or would like it reset, simply use the Lost Password feature, and enter Answer as the security answer.
Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error
Logarithmic Spiral (#3735)
Options
Go to last post Go to first unread
Previous Topic Next Topic
blowlamp  
#1 Posted : Saturday, April 23, 2011 4:28:52 PM(UTC)
blowlamp

Rank: Senior Member

Joined: 6/28/2008(UTC)
Posts: 648
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.
Back to top
jlm  
#2 Posted : Saturday, April 30, 2011 12:50:36 PM(UTC)
jlm

Rank: Senior Member

Joined: 2/18/2007(UTC)
Posts: 1,252
Man
France
Location: Paris & Frankfurt

Thanks: 217 times
Was thanked: 164 time(s) in 101 post(s)
I support Martin"s request.
In spring time...
Back to top
WWW
zumer  
#3 Posted : Sunday, May 1, 2011 1:07:36 AM(UTC)
zumer

Rank: Senior Member

Joined: 11/4/2007(UTC)
Posts: 515

Was thanked: 1 time(s) in 1 post(s)
The data fields evaluate functions, it should already be doable. Through parametric .spl import too, I'd guess.
Back to top
blowlamp  
#4 Posted : Sunday, May 1, 2011 4:32:30 AM(UTC)
blowlamp

Rank: Senior Member

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

You cannot view/download attachments. Try to login or register.
Back to top
billbedford  
#5 Posted : Monday, May 2, 2011 2:04:57 AM(UTC)
billbedford

Rank: Senior Member

Joined: 2/19/2007(UTC)
Posts: 186
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]
Back to top
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.
Back to top
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).

You cannot view/download attachments. Try to login or register.
Back to top
Users browsing this topic
Guest
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Powered by YAF.NET 2.1.2 | YAF.NET © 2003-2024, Yet Another Forum.NET