Help with chamfered counterbore

[SGoldthwaite]

I'm trying to create a chamfered counterbore.  I have a 3/8" diameter 82 degree chamfer mill.  My hole diameter is about 0.45 inches.  I tried to use the bore toolpath and offset the hole top by the negative if the flute length (per an old NYC CNC YouTube video).  But I get an error the the hole top can't be below the hole bottom.  My chamfer height is 0.0684.  I tried the chamfer toolpath too, but without success

I attached the fusion file.  See the setup: "Jaws for Peppermills".  It's the last OP called Chamfer Counterbore.

Thanks,

Scott

[programming2C78B]

Yes, because your hole bottom is less then .180 away from the top. Once you fix the top height offset, it will generate. 

I'd just do 2D contour > chamfer, select the top line of the chamfer and set your chamfer size to 0. Adjust tip offset to where you are not cutting into the cbore walls. Ensure your lead ins are small enough to work and keep your feed low.

[SGoldthwaite]

I wish I could figure it out with the bore toolpath, but haven't been able to generate a toolpath.

I was finally successful using the 2D chamfer toolpath, but not when selecting the top of the chamfer edge.   I selected the bottom of the chamfer and set width and clearance to zero, and tip offset to 0.079.

[seth.madore]

Because your countersink is inside of a counterbore, the Bore toolpath is not going to be the proper solution. 2D Contour or Chamfer is your best bet.

[SGoldthwaite]

I was trying the bore toolpath after watching this video:

https://www.youtube.com/watch?v=sVXV4Js3vDs

[seth.madore]

Hmm. It's possible that's something changed in the last 7 years 🤔