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#1 Posted : Monday, August 17, 2020 5:16:04 PM(UTC)

Rank: Junior Member

Joined: 11/21/2014(UTC)
Posts: 2
United States

Hello! I've been away from my work for a couple of years and now I'm trying to go back to work on some old projects and I find that I've forgotten a lot of what I knew about ViaCad. I'm using ViaCad Pro v12 with PowerPack.

This is an embarrassing question to have to ask but I simply cannot remember how I used to do this. Any help would be greatly appreciated.

I need to make a simple funnel with these particulars:

180mm diameter at top
25mm diameter at bottom
100mm total height

The funnel needs to be a surface, so that I can use the PowerPack "unroll surface" feature to turn the funnel into a flat shape that can be laser cut out of thin styrene and rolled up to form a physical funnel.

So, here's what I've done so far- I vaguely remember using this procedure to make funnels but I cannot remember how to complete the operation:

-Create one circle (curve) that's 180mm in diameter
-Create another circle (curve) that's 25mm in diameter
-Ensure the circles share the same centerpoint
-Move the 25mm circle down the Z axis 100 mm
-These two circles now represent the top and bottom rims of the funnel-to-be

You can see these two circles arranged as I've described in the attached image.

What I need next is to build a surface which represents the funnel wall. I need to do this without capping the top or bottom of the funnel with a surface, though.

So, which is the correct tool to use?

Also, if this is just the wrong approach to building what I'm describing, I'm open to hearing about a better approach.

Thanks, everyone.

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#2 Posted : Monday, August 17, 2020 5:52:20 PM(UTC)

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Joined: 9/24/2014(UTC)
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Powerpack doesn't require a surface, it unrolls faces of solids too. A funnel is a cone, a suitable cone can be made as primitive or revolve, your funnel is truncated, so easily lofted as skin surface or skin solid. That's all you've left to do, either of those tools between your profiles, then unroll the surface/face.
PunchCAD also lofts between a circle and a point, and if it were entirely consistent, a face made that way would unroll too, but it protests and says that wires aren't all open or closed, so I'm thinking that points must be Schrodinger's cat-type objects, neither open nor closed.
#3 Posted : Sunday, August 23, 2020 3:48:57 PM(UTC)

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180 deg x 180 mm (bigger diameter) / L (side length from "cone top" to base). Enjoy.

Edited by user Sunday, August 23, 2020 4:13:44 PM(UTC)  | Reason: Not specified

thanks 2 users thanked luk72 for this useful post.
MPSchmied on 8/24/2020(UTC), a.wieneke on 8/27/2020(UTC)
#4 Posted : Thursday, August 27, 2020 11:07:26 AM(UTC)

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Location: Köln ( Cologne )

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thank you, luk72, very much for this video
viele Grüße

SharkCad pro 14
OS X 14.0
L. Banasky  
#5 Posted : Sunday, August 30, 2020 2:34:28 PM(UTC)
L. Banasky

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Joined: 2/16/2007(UTC)
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Another method for a funnel pattern. this is the 'Old Way', dividers and a flexible metal rule.
For laser cutting, I've had good results using an R-12 Autocad .dxf, or Ver.12 CorelDRAW .cdr.
seems the older versions work the best.
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