cart creation problem

[massiG82]

Hello, can you explain why sw gives me this problem?
I would like to create the seat for a hydraulic piston that backs before the separation of matrix and punch.

to say it with other words, is it not a simple cutting-extrusion function? using this function I can in fact get the seat for my piston, but I thought the cart function was more indicated...but sw tells me precisely that I create more bodies. .
Thank you.

 

[Oldwarper]

If you see well, you're creating two trolleys.

you have to limit the creation of trolleys to one cart at a time.

 

[massiG82]

Okay, but then, given the deform, how do I make sure that the hole in the matrix and the hole in the punch exactly correspond? I try to explain better:
I create the cart in the matrix with a sform of 0.5°: starting from a d=25.2 mm with the sform of 0.5°, at the end of the thickness of the matrix this will be narrowed of a tot... at that point how can I be sure that the next cart that I will create instead on the sting has a diameter equal to the diameter previously shaped on the matrix? should I simply measure it and start with that measure?

I attach an image to clarify well how they are made matrix and punch