Creating Beveled Edges

liam_boyle

So I'm working on designing out a modern version of an antique blade.



I need the handle and interior area to have a thickness of 6 mm and then symmetrically taper out to the exterior edge.


I did a symmetrical extrude to the correct thickness, now I need to bring the material out in a wedge to the outer spline curve.  My apologies for the noob question but I didn't see quite how to do this in the help or the videos.  If it is there could you all pleade point me in the right direction.

matthew_menard

I was coincidentally thinking about almost this exact same situation the other day, so I gave it a try.  Here's my (in my opinion) fairly terrible take on what you started:



https://cad.onshape.com/documents/56d4a9afe4b02da21ba11c9f/w/9f61de78675dd80f47144111/e/1f2ae805e0176896e58240fe

The main thing I did was make a surface loft from the upper surface inner portion of the blade to the midpoint outer edge of the blade.  That is where I started running into trouble.  I would usually just split the bodies using this surface, but I think it didn't like the fact that the back side of the blade is a non planer surface.  I ended up thickening the surface and then splitting it and then deleting the bodies I didn't want.  Finally, I added a triangle to your base sketch to trim out a small residual surface defect that resulted from Booleaning  the previous operations together.  Hopefully somebody more familiar with Onshape's surfacing capabilities will come up with a better solution.

_Ðave_

If you share a link to your public document I'm sure that someone would be glad to show you how to loft this.

liam_boyle

I just made it a public document "Yataghan 3" not sure how to generate the links yet.

_Ðave_

Just cut and paste from your browser address.

Here's the LINK for anyone interested.

Thanks

_Ðave_

Below is my attempt at your knife edge ask if there's still any questions.

Link

 HTH
_Dave_

liam_boyle

Thank you.  

matthew_menard

I was coincidentally thinking about almost this exact same situation the other day, so I gave it a try.  Here's my (in my opinion) fairly terrible take on what you started:



https://cad.onshape.com/documents/56d4a9afe4b02da21ba11c9f/w/9f61de78675dd80f47144111/e/1f2ae805e0176896e58240fe

The main thing I did was make a surface loft from the upper surface inner portion of the blade to the midpoint outer edge of the blade.  That is where I started running into trouble.  I would usually just split the bodies using this surface, but I think it didn't like the fact that the back side of the blade is a non planer surface.  I ended up thickening the surface and then splitting it and then deleting the bodies I didn't want.  Finally, I added a triangle to your base sketch to trim out a small residual surface defect that resulted from Booleaning  the previous operations together.  Hopefully somebody more familiar with Onshape's surfacing capabilities will come up with a better solution.

liam_boyle

So, after reading the posted answers, I created two three point planes at either end of the area in question and sketched in some bevel triangles.  I then did a surface loft from the edge of the interior spline curve to the exterior curve and then repeated the process on the other side.  The result is below.

_Ðave_

+1 Nice 

liam_boyle

Thanks _Dave_ I did the same thing for the triangular area above the spine.  Now I just have to add the pin holes to the tang (handle area) section and add some grooves near the spine to reduce weight.

Then I can move on to the rest of the pieces and final assembly.