Possible Bug?: 2D Pocket for Countersunk Holes Doesn't Take Off All Material in Simulation

[jschmidt1340]

Hello, all.

First, please bear with me. I am brand new to the Manufacturing space in F360 and also to CNC/CAM in general.

I'm designing some simple parts to be cut with some countersunk holes. Here is a screenshot of the hole feature parameters and the resulting model:

I apologize for the order in which the screenshots are shown. But, below are screenshots of the setup and tool path as well as the simulation. 

In the simulation, you can see the problem. Maybe it's just a rendering issue? But, it leaves part of the material. Maybe I'm misunderstanding how to set up the tool path for these holes.

Any assistance is much appreciated!

Jonathan

[seth.madore]

I prefer to skip right past the screenshots and download the offending file, but there isn't one attached. Can you share the file?
File > Export > Save to local folder, return to thread and attach the .f3d file in your reply

[hollshwanderc]

Hello Jonathan,

I suspect it is probably a rendering issue with the simulation.  I have seen similar things when I am working on my home laptop that does not have a really good graphic card.  What seemed like material that wasn't fully cleared in the simulation, when running git on the laptop, did not show up when i ran the same simulations on my CAD/CAM workstation at the office.  I did a quick hole pocket operation on a .500" OD hole with a .125" endmill with the settings similar to what you showed in your screenshots, and the hole came out clear with no issues.

If you post your model I can take a look at it, or I ma sure others on the forum would have suggestions.

Another option you have is use a cuter that is slightly larger than the radius of the holes you are trying to pocket out.  For example if you wake .500" counterbores, you could use a .3125" dia. cutter.  That way you are sure that center material in the pocket will indeed be cleared out.

Chris

[jschmidt1340]

Apologies. I should have attached the model. Here it is. I really appreciate the assistance! In case it isn't obvious, it's a a modular spoilboard that leaves spaces for the T-track on my CNC machine.

[a.laasW8M6T · Accepted solution]

The issue is likely related to how you have selected the contour for 2d pocket

If you select the FACE fusion assumes that the bolt hole is already there and doesn't need to machine that material away.

If you select the EDGE of the bottom of the counterbore you should get the result you are looking for

[hollshwanderc]

I am stumped on why the simulation was showing the way it was.  As  a.laasW8M6T mentions, it can have to do with the geometry selection.  I was getting the same thing in the simulation when I first looked at the file.  I couldn't see anything that was an issue in the programming strategy.  But I did notice under the geometry tab that the area to machine had an unshaded area over the secondary thru hole. But you had selected the edge of the counterbore at the bottom of it.  So I just unselected the geometry and reselected the bottom of the the counterbore.  Starting with the first hole nearest the X axis.  Then re-simulated the operations and it seemed to "cut" just fine.  Except that the counterbore pocket operations are starting at the middle hole, not in the order that I selected the geometry.  Again, stumped on this one.  But this file should get you the result you are looking for.  See the attached file that has my reselection of the geometry.

Chris

Seth may be able to shed some more light on this.

[a.laasW8M6T]

The thing is if you select the face it shows up as a chain selection, there is no real identifier that tells you whether you have selected the face or the edge other than like you say the shaded area and how the toolpath behaves.

There is a tool tip which explains the selection differences if you hover over pocket selections, but it can catch people out.

[jschmidt1340]

Thank you to everyone for their help! Selecting the edge geometry as opposed to the face looks like it simulates correctly!