3D Model Cavity Help

[m32kurt]

Can anyone provide any help into 3D toolpaths?
I created a 3D model in Mastercam 2023. I want to cut out a cavity of this model out of a basic rectangle stock. 
 

I am struggling to find a 3D toolpath that can accomplish this. The ones I’ve tried want to take away all stock and leave my model as the finish. 
I want the inverse of this: my model to be the cavity. 
 

Any tips or recommended 3D toolpaths for me? 
I have exclusively worked in 2D toolpaths in the past and I can’t find any great reference material. Thanks

[Jake L]

You may be better off creating a solid with your model carved out of it then programming it the "normal" way. You can accomplish this by using the Solids > Create > Impression tool. 

Another option is to create surfaces on the model you have and flip the normals. Surfaces > Create > Surfaces from Solids --- then --- Surfaces > Normals > Change.

I'm sure there's other ways as well, just a couple off the top of my head, many ways to skin a cat in Mastercam.

Once you have the "inverse" of your model, the 3D toolpaths will function a lot better for you.

[AHarrison1]

Do you have a file to share so others can play along? Difficult to help without seeing what you are seeing.

Barring that, I suggest reviewing some training material.

This site offers some training material for free.

 

[#Rekd™]

19 hours ago, m32kurt said:

I want to cut out a cavity of this model out of a basic rectangle stock. 

I created a video for you showing how to create a cavity from a solid model.

https://www.dropbox.com/scl/fi/hk066mbfanw9r8e3fx53a/CreateMoldCavity.mp4?rlkey=bfu7st9uro7iveufb543cvsfw&dl=0