How can I stop a Fillet from going too far along a part?

john_smith077

Hello

I have a problem. I want to stop a Fillet from going too far.

I suspect that the problem is that I Extruded too much at once(!) And now when I come to Fillet I need to find a way to stop the fillet.
At present, if I select one small edge at the far end of my part and then when I apply the fillet, the entire side of the part gets filleted at once!

In this case I want area C. and D. to be filleted but not areas A. and B. :



The only way I that I found whereby I could achieve this was to extrude areas "A." and "B." on a temporary basis as this seems to put the filleting off(!). And then extrude using remove back to where it was.

Although this does seem to work... is there not a better way? e.g. Is there any way you can just draw on the part to stop the Fillet from going any further?



Many thanks

J

brucebartlett

Hey John, If you share a public doc url (copy and paste from the browser) we can take a closer look. 

jakeramsley

It's possible it is tangent propagation.  With that option on, fillet looks for edges that are tangent to it and applies the same fillet to it.

john_smith077

I've made rather a mess of the document since posting the above but here is another example problem (in the same document)



As you say if "Tangent Propagation" is switched on, it fillets the big circle below it. 
But if I dont have Tangent Propagation switched on then it doesnt seem to fillet at all !

Fwiw, my cunning scheme to apply an extrusion where I want the propagation to stop isn't very clever because it wont let me Extrude with Remove back to where it started !

Anyhow here is the URL 
https://cad.onshape.com/documents/f08cf9fe372f41b5a331512f/w/dd46f3348064476e8acbba79/e/416c3409f0f44a95a6ec2383
Which I can leave public for 3 days or so only. 

In this case there would be other ways to remove the material (e.g. with an Extrude Remove) but in other situations doing a partial fillet it may not be so easy...(!)

Many thanks

jakeramsley

If you want to have it end at that point, I would do a sweep -> remove with the section you want to remove.

1. Sketch on the end face and draw an arc and two lines creating an enclosure.  Set the lines coincident with the edge and their shared vertex coincident with the end vertex.  Then set the arc to be tangent to both edges.  Add a dimension for what the value of fillet you want.


2. Start a sweep.  Select the sketch profile as the profile to sweep and then pick the edge for the path.  Set the type to be remove.

3dcad

john_smith077 said:

..

Fwiw, my cunning scheme to apply an extrusion where I want the propagation to stop isn't very clever because it wont let me Extrude with Remove back to where it started !

..

On depth defining to fillet I agree with Jake.

For your workaround I would use 'move face' so that first move say 20mm out then same value back in. If you wan't high end, create a variable and use that as value for both directions.