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Scale Inconsistencies (#3866)
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blowlamp  
#1 Posted : Thursday, July 14, 2011 4:29:55 PM(UTC)
blowlamp

Rank: Senior Member

Joined: 6/28/2008(UTC)
Posts: 648
Someone on another website posed the problem of how to 'tangent fit' an ellipse into a parallelogram, so I thought I'd give it a go with ViaCAD, using an example that was put forward by a chap there.

His technique was to differential scale a circle into an ellipse, but it doesn't seem to be something that can be done as easily as it should be for us.

I've included a video to try and show how the behaviour of the Scale tool varies when used on curves compared to surfaces.

In short, I would have liked to scale one axis of the circle along the orientation path of the Gripper/Workplane, .

Martin.

http://screencast.com/t/9sJzWOAsV
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billbedford  
#2 Posted : Friday, July 15, 2011 1:18:55 AM(UTC)
billbedford

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Joined: 2/19/2007(UTC)
Posts: 186
Originally Posted by: blowlamp Go to Quoted Post
In short, I would have liked to scale one axis of the circle along the orientation path of the Gripper/Workplane, .

Can't you just turn off 'uniform scaling' in the gripper inspector?
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blowlamp  
#3 Posted : Friday, July 15, 2011 1:37:57 AM(UTC)
blowlamp

Rank: Senior Member

Joined: 6/28/2008(UTC)
Posts: 648
Originally Posted by: billbedford Go to Quoted Post
Can't you just turn off 'uniform scaling' in the gripper inspector?


It is turned off in the video. The problem is that curves aren't scaled to align with the workplane/Gripper when is either is rotated.


Martin.
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billbedford  
#4 Posted : Saturday, July 16, 2011 2:12:42 AM(UTC)
billbedford

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Joined: 2/19/2007(UTC)
Posts: 186
The gripper works as expect as soon as it s realised that the circle is a special case of a circular arc, i.e. it has start and end points.

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Tim Olson  
#5 Posted : Monday, July 18, 2011 3:57:25 PM(UTC)
Tim Olson

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United States

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>>In short, I would have liked to scale one axis of the circle along the >>orientation path of the Gripper/Workplane, .

Martin, thanks for the heads up. Fixed.

Tim
Tim Olson
IMSI Design/Encore
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blowlamp  
#6 Posted : Tuesday, July 19, 2011 10:39:33 AM(UTC)
blowlamp

Rank: Senior Member

Joined: 6/28/2008(UTC)
Posts: 648
Thanks for sorting it out, Tim - it's much appreciated.


Martin.
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