I Beam Making

[2herds]

Being new to this it may be a simple question but I can't seem to figure out what to do next to make an "I-Beam".

First attempt: I made a rectangle and sized it. Then made another rectangle the size of the lower portion of an I-Beam and used "cut" to remove the material. That did remove the lower material forming 1/2 of a beam.

I could have made a second removal rectangle for the top I beam cut out, but figured if I made a rectangle of the correct size external to the Beam I could copy it and move it twice to the upper and lower cut areas of the proposed I-Beam. I was successful in this but could not get it cut.

Guess I must be thinking of this wrong, but I am at a loss. It should not be that difficult to make a simple I-Beam.

[JDMather]

I would do three simple rectangles and then Extrude.

Then add the Fillets.

[2herds]

Used your suggestion to create an I-Beam that looked ok. But I got in trouble with the fillets. For some reason one side (say the right) top and bottom made fillets ok but the other left side simply would not. It kept curving inward instead of filling a fillet.

I checked and attempted to insure all 3 sides were joined, that still didn’t help with the fillet problem.

However, I did get much farther this time, so Thanks for the idea 🙂

Tom Herd
2herds@rap.midco.net

[JDMather · Accepted solution]

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@2herds wrote:
.... It kept curving inward instead of filling a fillet.

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When in doubt - File>Export your *.f3d file to your local drive and then Attach the file here.  Otherwise you are shooting in the dark.

It sounds to me like you have multi-body solid rather than a single solid body -

- either make sure you have all three rectangles selected when doing a single Extrusion

- or make sure you are doing Join with multiple Extrusions

- or do Combine if multiple solid bodies.

Attach your file here and end all doubt.

Next step - you can do the dimensions as Parameters and then simply select the W-size that you need.

[TrippyLighting]

It sounds to me lie your there rectangles were not perfectly adjacent to each other and formed separate bodies.

Have you checked the bodies folder in your I-beam component ?

[2herds]

Found the problem, only 2 of the 3 sides were joined. Once all were joined I was able to fillet the 4 corners by rotating the model accordingly.
I did notice in Render the fillets did not show up. I remember that on threads a box has to be checked, but I will have to go back and see where something is missing.
Again thanks for your help.

Tom Herd
2herds@rap.midco.net

[2herds]

Found the problem, only 2 of the 3 sides were joined. Once all were joined I was able to fillet the 4 corners by rotating the model accordingly.
I did notice in Render the fillets did not show up. I remember that on threads a box has to be checked, but I will have to go back and see where something is missing. (I have sent this response to another member who also answered me.)

Thanks for your help.

Tom Herd
2herds@rap.midco.net

[TheCADWhisperer]

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@2herds wrote:
. I remember that on threads a box has to be checked, but I will have to go back and see where something is missing.
Again thanks for your help.

Tom Herd
2herds@rap.midco.net

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The way I connected the 3 rectangles was with the Midpoint constraint.

You are really hindering yourself by not attaching your file here.

On a wild guess -

the thread model vs this Fillet problem are entirely different issues.

I am guessing that you had a Sketch fillet rather than a Feature fillet.

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

[Anonymous]

Why not draw the I then extrude?

[TheCADWhisperer]

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@Anonymous wrote:

Why not draw the I then extrude?

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You have replied to an old thread.

Fusion 360 changes over time.

When this thread was started - Thin Feature Extrusion did not exist in Fusion 360.