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Sheet Metal - 'Y-Branch' help


Ste1978

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Hi,

 

I am trying to model a Y-Branch piece of Duct in sheet metal. I can do this by drawing up a 280mm dia duct, then extruding/cutting a sketch across/through the tube to create the hole. However, I am interested in how other people create these, as I am not familiar with fabrication techniques, I would like to know the 'correct' way of creating a Y-Branch duct... I can create a flat pattern of my duct with the hole, but I do not think it's very practical for a plasma machine to cut this, I would like if someone with experience could upload a version?

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Extrude-Cut does not sound like a correct sheet metal operation.

Attach your *.ipt file here.

 

Hi JD,

 

I would but I cannot upload more than 500K and I need 1.15mb!

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If you go to the Flat Pattern and then Wireframe view - you will see that you have not modeled the part correctly for sheet metal.

Back in a bit.

 

I usually name the surface body file something like Y-duct Master.ipt

See attached example.

 

Y Duct.zip

 

Always check flat pattern in wireframe view to make sure there is not a double line for boundary of the flat.

Edited by JD Mather
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wow,

 

I would never have through of using a surface revolution, thanks JD - It saves me fettling the lines out of the DXFs for sure!

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Some cutting machines don't like spline curves. There is a way to fix that from Inventor if that is a problem with your machine software.

 

All sheet metal is - is a thickened surface. And by thickening a surface (when the standard sheet metal tools won't work, or are too much work) you ensure that the cut sides are perpendicular to the flat.

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