Extruded Thin Ribs

[dgschaefer]

Creo 2, M040

I swear I remember seeing that there was an enhancement in WF5 or maybe Creo 1 to allow you to sketch a series of lines, multiple open sections, and extrude that as a thin feature.  They showed it creating a network of ribs in a plastic part.

I’m trying to do this in an internal sketch (a simple T) in an extruded thin and Creo 2 is giving me the same old ‘ multiple loops must be closed’ error.  I tried again with an external sketch and got ‘Intersecting entities encountered in the section’ and Creo refused to use the sketch.

Am I dreaming about these extruded ribs?  If not, how do I do this?

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[Dale_Rosema]

I remember that at a SW users group meeting recently, but not on Pro/Creo.

[VladimirPalffy · Accepted solution]

Do you need to create the new feature - Trajectory Ribs

You can find other video tutorials here: http://learningexchange.ptc.com/tutorials/by_product/product_id:1

Regards,

Vladimir

[dgschaefer]

That's it, but it seems limited in that ribs cannot terminate at an open edge of the part.  In my case there is no side wall and the feature fails.

[VladimirPalffy]

Hi Doug,

... yes it is true - do you need to create side walls for Trajectory Rib feature.

For your example, you can create closted shell and then you can use Solidify feature (create cut by plane/surface)

Regards,

Vladimir

[BrianMartin]

You could use a normal profile rib for the open ended section and then use trajectory rib for the rest. Trajectory rib has some very, very nice features. It may be asking a bit much for the feature to know where you want it to end automatically but it's fantastic for most internal rib applications.

[rohit_rajan]

there is an option in draft tool.."extend intesect surfaces"....may be this option can be put in the trajectory rib tool as an enhancement request!

[dgschaefer]

After playing with this tool I find it quite useful, but rather specific in application.

The open end points of your sketch have no bearing on the end of your ribs.  Proe / Creo is going to extend or trim them at the side wall of the part.  So, a 1” long line inside a 10” wide part produces a rib across the full 10”.  Conversely, a 10” long line over a 1” long part produces a rib only inside the 1”.

That explains why my sketch above wouldn’t work.

[Dale_Rosema]

Thanks for sharing.

[VladimirPalffy]

Vote for new IDEA - Trajectory Rib feature for open geometry

Regards,

Vladimir