When I do an extrude cut at a 45 degree taper it results in a random curved corner not shown in the preview.

gabe_nelson
Participant Participant
449 Views
14 Replies
Message 1 of 15

When I do an extrude cut at a 45 degree taper it results in a random curved corner not shown in the preview.

gabe_nelson
Participant
Participant

gabe_nelson_0-1699936908508.pnggabe_nelson_1-1699936928604.png

What is up with this? Why does it do this?

0 Likes
Accepted solutions (1)
450 Views
14 Replies
Replies (14)
Message 2 of 15

g-andresen
Consultant
Consultant

Hi,

Please show with a screenshot what you want to achieve in the end.

 

Please share the file.

File > export > save as f3d on local drive  > attach to post.

 

günther

0 Likes
Message 3 of 15

gabe_nelson
Participant
Participant

What is missing from the screenshots I already posted?

0 Likes
Message 4 of 15

TheCADWhisperer
Consultant
Consultant

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

Can you reproduce this behavior in a new dummy file?

0 Likes
Message 5 of 15

gabe_nelson
Participant
Participant

.

0 Likes
Message 6 of 15

Warmingup1953
Advisor
Advisor

There will be a work around...This is via delete face but there should be a more elegant way!Tee.jpg

 

 

 

T2.jpg

0 Likes
Message 7 of 15

gabe_nelson
Participant
Participant

how do you use the delete face feature to do that?

Nevermind I figured that part out. My next question is, how do I apply a tangent constraint to two curves. I can do this in onshape but not in Fusion. How can I make this work? This is the same file but on the "e" now. I want to apply a tangent constraint between the two curves at the top left of the e. The one's I've zoomed in on in the screenshot.

gabe_nelson_0-1700277811155.png

 

 

0 Likes
Message 8 of 15

davebYYPCU
Consultant
Consultant

All the black and blue fillets in the sketch are already Tangent. 

You can't change the purple curves unless you break its link to the source.

sfatdb.PNG

You might add modelling fillets to the problem faces.

 

 

Might help,,,,

 

 

0 Likes
Message 9 of 15

gabe_nelson
Participant
Participant

In that example the curve is made tangent to the flat line at the top since I couldn't tangent it to the curve. However that causes the extrusion to fail. In another cad software I was able to solve that extrusion failing by making the curve tangent to the curve as in this example 

gabe_nelson_0-1700289780520.png

However I can't get fusion to replicate this behavior.

0 Likes
Message 10 of 15

davebYYPCU
Consultant
Consultant

Should be no failures, in that area, except the purple corner is open.

 

sfatd1b.PNG

 

Blue / black fillet curves must be tangent, and coincident to the endpoints if applicable.

0 Likes
Message 11 of 15

gabe_nelson
Participant
Participant

I have an update since the file I posted originally was in disarray from me trying things. As you can see in this file I can't tangent the upper left curve of the e to another curve nearby. I can tangent it to the straight line at the top but if I do that then the -45 degree taper extrusion off that shape fails.

0 Likes
Message 12 of 15

davebYYPCU
Consultant
Consultant
Accepted solution

Extrude taper cut was self intersecting, Fusion's biggest no no. Wider profile allows for deeper cut.

 

thcwdb.PNG

 

The profile was too narrow, and I widened it by 1 mm, put the outside top curve tangent to top line.

 

Might help....

0 Likes
Message 13 of 15

gabe_nelson
Participant
Participant

Thanks, I was able to get something that will work by making things wider. Is there really no way to tangent to a curve in Fusion? That seems like a pretty serious oversight.

0 Likes
Message 14 of 15

davebYYPCU
Consultant
Consultant

You were never going to those 2 curves tangent, the projected one is a spline

Spline tangency is not implemented. 

Serious oversight or known limitation, can't say.

 

Might help....

0 Likes
Message 15 of 15

gabe_nelson
Participant
Participant

It shouldn't be a spline, I don't know how that happened. It works fine if I change it back to an arc. Thanks for catching that.

0 Likes