3D duct work

[christopherr]

Hiya guys

I need some help with modelling some duct work.

I have 2 bits of vertical duct, 1 600mm dia & the other 1200mm. They are also offset from each other horizontally.

I need to join them together with a single piece of duct and without the use of bends.

So basically it is a bit of duct the moves horizontally, vertically and tapers all at the same time.

As yet i have been unable to model this in 3D. Is there anyone that has any idea how to go about this.

Im using AutoCAD 2004 by the way

Thanks in advance

[jaberwok]

Hi Chris.

One way is to create the circles that represent the ends of the transition and break each into 2 or 4 arcs then use Rulesurf to create the mesh that joins them. M2S.lsp will create solids from the meshes so that the solids can be unioned into a single object.

BTW, it's not essential to break the circles into arcs but it does give you better control.

HTH

[christopherr]

Thanks John, thats brilliant

I did need to break the circles as the rulesurf command only works with open meshes, but the m3s.lsp didnt seem to work as intended.

However, i am more that happy with leaving it as a 3D mesh for now.

[jaberwok]

Hi Chris. Glad to help.

To use M2S.lsp your UCS needs to set so that, in plan, the narrow end of the transition appears closer to you than the wider end.