Rapid collision with stock

[michael.buschmannXK37K]

Hello,
I am trying to mill out a cube from a raw material using 3D Adpative Clearing.

I know that 3D Adpative Clearing might be a bit overkill for this application, but I'm looking for something completely different. I am concerned that no matter in which project I use 3D Adaptive Clearing during the simulation the error "Rapid collision with stock" always occurs multiple times.

As in this example, it often happens that the error occurs when the cutter first dips into the stock. The milling cutter changes from "Rapid" to "Lead-in" too late. But why?

I'm pretty sure I have the treble set correctly.

Does anyone have any idea what the problem is? In this case it may not be that bad but as mentioned before I have the problem everywhere I use 3D Adaptive Clearing. I am really trying to understand what is causing this problem so I can avoid it completely in the future.

Below are a few more screenshots showing the rest of the settings.

[a.laasW8M6T]

That's because you have defined a boundary  and told it to stay inside.

You should leave the Machining Boundary as "none"

3d adaptive knows where the stock starts as defined in your setup, boundaries are really used to stop the tool going places you don't want, in this case you would be fine without a boundary.

[michael.buschmannXK37K]

I set Machine Boundary as none. But still the same problem. Nothing changed...

[a.laasW8M6T]

Ok, can you upload your file here?

It's pretty hard to diagnose from pictures

[michael.buschmannXK37K]

Okay, thank you.

[a.laasW8M6T]

Ok, problem solved, you just need to turn stock contours on with the selection set as nothing, this will pick the extents of the stock from the setup.

[michael.buschmannXK37K]

Thank you very much for your help. Unfortunately, this does not solve the problem.

If I do it as you say, the problem no longer occurs, but that's only because the cutter now dips into the stock not from above but from the side. Now the milling cutter also cuts the entire stock.

It must be possible to use 3D Adaptive Clearing with Machine Boundary so that the entire stock is not cut. Or not? Isn't that what the Machine Boundary option is for?

[HughesTooling]

Adaptive is not the right tool for what you're trying to do. 2d contour with a ramp would work better

Another option is to enable stock profiles so the plunge is outside of the stock

Or you'll need to drill a hole to start in. Would be nice id 2d contour had a helical start option so it could bore a hole to start in.

[HughesTooling]

See attached file. I created a folder with a bore then 2d contour, try selecting the folder and simulating. Some cam systems can do this in a single op. I've also left the ramp and plunge outside of stock options. 

[michael.buschmannXK37K]

Thank you for your efforts. Unfortunately, this does not really help me. I am aware that there are better functions for my example. But I deliberately chose a simple example to show what kind of problem I have in general with the 3D Adaptive Clearing function. The stock collisions occur even more often with more complicated objects, where 3D Adaptive Clearing is justifiably used.

I would like to explore in this post why the error occurs with 3D Adaptive Clearing even with such simple geometries and how I can avoid this error. I don't want to find the best function for my example in this post.

[guilherme.awv]

People have been trying to help you but if you don't provide enough details it is not possible, share a real situation or what exactly you're facing.

I have been using 3d adaptative with no problems, even for more complex stuff other than a square

[a.laasW8M6T]

Hey, I think I have a better Idea of what your after, yes you can use boundaries, the problem you were running into was having stock contours turned off.

Check out this screencast

https://autode.sk/3wFQUh9 

[HughesTooling]

So you want to pocket a channel around your part in stock that's a lot bigger than you parts?

These settings will do that.

[HughesTooling]

You can also do this without any sketch boundaries using silhouette. Note the additional offset needs to be big enough to allow for the helical diameter and minimum radius settings.