Error. Combine - Cut bodies.

[fundamental4]

Hello,

I need help, please. I don't know what's wrong here. 

How can I Combine-Cut (Body 22 - Body 31)?

File:

http://a360.co/2EF5gmR

[jeff_strater · Accepted solution]

the problem here is that some faces of these two bodies are coincident.  If you have coincident faces that are not just simple planes or cylinders, Combine is going to have a hard time succeeding.  One way around this is to move one of the bodies so that there is a more clear overlap, if your design constraints will allow that.  I found by moving just 0.005mm, I can get Combine to work:

Jeff

[fundamental4]

Hello Jeff,

thank you for your quick reply.

I did as you said, I had to move it 0.5 mm in order to be cut, but I obtained a weird base for new body.

Body 22 is a support for body 31 to 3d printed, so it has fairly freedom to be designed, as long as it was small, and its base must be smaller (or iqual) than 0.4 mm. because it will be "hinged broken" at this point.
In principle it can only be modified with this Sketch19 +Sweep (Body23) to be Cutted.
So, my goal is a Body 31 with a base 0.4mm (+-0.1).