Beginner Chamfer

gene_russell

I want to chuck a piece of hex stock in a lathe and cut a 45 chamfer on the end so that the chamfer just creates an included circle of the hex. I can't get Onshape to recreate this operation in a simple way. It seems simple so it should be simple? What am I missing?

PeteYodis

@gene_russell Have you tried a revolved remove using a sketch for the remove profile and the center of the hex as the revolve axis?  This would simulate a lathe cutting operation.  

PeteYodis

@gene_russell Have you tried a revolved remove using a sketch for the remove profile and the center of the hex as the revolve axis?  This would simulate a lathe cutting operation.  

gene_russell

Thanks Pete, It took four hours but I finally got the revolve to work. It took a sketch on each end of the hex part to create the included circle with a reference line from the corner of the part to  the circle. And a sketch on a plane through the axis of the part to draw  45 triangles for the revolves. This all seems clumsy. What is going to happen to my regen times when I create an assembly of 50 or so of these parts all with two revolves?

owen_sparks

If you post up a link to your document I'm sure somebody will show you a simple method. This should be a 30 seconds feature to design unless I'm missing something.

gene_russell

Here is the document.
https://cad.onshape.com/documents/3330421f58ac4065082414da/w/ac41a903de11d46be636b621/e/5f5e42dd88479dafac2bdf61

dick_van_der_vaart

@gene_russell
Is this what your looking for?
https://cad.onshape.com/documents/4ea2ecac9c27656ba22bd03e/w/375fc9562635f07173bc8bdb/e/4671e6cc67df9ca75520bc67

gene_russell

Thank you Diick,
The mirror certainly improves the simplicity. I am confused by sketch4. How did you derive the .039 dimension? If I resize the original extrusion doesn't the fixed nature of the dimension break the correctness of the chamfer?
When I started this adventure I expected that some option in the chamfer command would handle this situation. Nearly every part that comes off of a lathe is going to have this type of edge break and it seems very cumbersome to represent each instance with a revolve remove.

dick_van_der_vaart

Hello Gene,
I made a change to sketch4 the dimension is now an angle.
As you can see in the configuration panel, now you can change the basic dimension to what ever you like without breaking something.
Good luck

gene_russell

Okay. Thanks everyone for helping me grope my way through this.

dick_van_der_vaart

@gene_russell
Forgot to to put in the document
https://cad.onshape.com/documents/4ea2ecac9c27656ba22bd03e/w/375fc9562635f07173bc8bdb/e/4671e6cc67df9ca75520bc67