Entry / Ramp with 2D Adaptive Clearing - Plunge Outside stock vs. Helix

[MacNite]

Hey guys,

I have a problem using 2D Adaptive Clearing in Fusion 360 regarding the entry / ramp at the start of my cut.

I have setup everything mostly correct I assume. 

But when I select the regions of the part which should be machined I get a problem. The right pocket-style feature in the bottom picture uses a helix ramp which is totally fine and theh way it should be.

The section on the left side does not. It "tries" to plunge outside the stock - which would be with me, if it would in reality plunge outside the stock, but it only plunges outside the model - if you understand my problem. The entry position is not machined yet so the endmill will just run into my aluminium stock...any suggestions how to fix this?

I'd like to use a helix ramp - that would be the easiest solution I assume. Otherwise plunge outside of stock would be fine...if there was a way to ensure the plunge happens outside the stock and not outside the model (I already tried using "entry points" without success.

Here is a link to the file in question:

https://a360.co/2J6pMS6

Max

[martin.dunschen]

Hi @MacNite 

I will take a look at your example, thank you for sharing.

What does the stock simulation show? If there is a problem with the toolpath approaching the stock from the outside this should be detected as a potential collision. Is that the case?

Martin

[MacNite]

Thanks for your help.

The simulation shows a collison of the tool with the stock, but only when moving in the z-direction. The collosion from over the length of the lead in is not detected / shown.

[seth.madore]

That's because you don't have Stock Contours turned on. 2D Contour is a "dumb" toolpath that doesn't "see" the stock. However, if you turn on Stock Contours and don't select anything, you get this for a toolpath:

Obviously not what you want. So, we can create a sketch instead to use that as stock:

Gets you this:

[MacNite]

Thank you.

I was not aware of this - I can reproduce these tool paths myself now -  and it will me help down the line. But this does not solve the problem completely.

Obviously the first picture you posted would solve my problem but is a littel bit un-convenient (at best :))

I've tried different approaches on using the sketch but it either does something similar to your 1st picture - but I alway have the one "entry" (red circled) which would plunge straight through the stock.

I just want to have the entry from the sides with the black arrows - these are the only places where my tool can plunge outside the stock.

The only solution I found to solve this prolbem outright is to make the feature an "artifical pocket" - but I don't think this is elegant or the right way to do it. Or: start with milling the contours so the obstructing material is already removed at that point.

Thanks for your help!

[seth.madore · Accepted solution]

Using the same sketches, you can now go into 3D Adaptive and use that sketch to further constrain your part. A combination of selections and stock contours should get you there