topic Re: Doubt border in PowerMill Forum

Doubt border

Anonymous — Mon, 23 Nov 2020 11:57:45 GMT

Hello,

In the attached project, strategies 2 and 2_1 execute with edges with the same characteristics, but edge 13_1 is planned, observing different results, I would like to understand this situation, being that in the upper plane they are identical.
Thank you very much in advance.

Hug.

Re: Doubt border

ChristopherMarion — Mon, 23 Nov 2020 14:26:21 GMT

Hi @Anonymous

Hopefully I understand your question correctly. If not, please elaborate.

The boundary edges for boundary 13 & 13_1 are identical but are located at different heights. When PowerMill calculates toolpaths with boundaries, it calculates the toolpath normal in the Z axis towards the model. The purpose of the boundary is to localize the machining within the boundary or outside the boundary....not to stop the tool in the Z plane. If you are expecting the toolpath the stop at the boundary Z level, this will not occur. If this is the behavior you are looking for, you will need to use the Z minimum and maximum planes located in the Limits page.

Re: Doubt border

Anonymous — Mon, 23 Nov 2020 16:39:18 GMT

Hello,,

In fact, I would like to understand that, in my opinion, the two borders should have the same result in the strategy.
But due to the explanation, the height of the border also influences the result.

Would it be this?

Re: Doubt border

ChristopherMarion — Tue, 24 Nov 2020 03:59:10 GMT

Hi @Anonymous

Ok, I took another peek at this and I see the differences between the two toolpaths using essentially the same boundary. The only thing that I can see is that the selected surface boundary has been edited. One of the edits in both boundaries is an offset of -0.03mm, which causes the boundary to flatten to the mid point of the selected surface. The 2nd edit is a flatten to a Z level of -69.66. This edit only occurs in boundary 13_1.

I think this last edit is what is causing the issue.

Now, the surface is a selected surface boundary. If you want to offset the boundary slightly, you can offset this type of boundary in a 3d fashion instead of a 2d fashion (which was applied).

Hopefully this answers your question.