plastic part dimensions control

[CNC-ERIC]

Hi,there,

 

I am macining a PET-P plastice part on a VMC,profile size is 193x50mm, there is pocket inside, 162.5x32mm depth of 37mm. my question is that after machining the pocket the profile dimension changed to 193.28 at the top position,50mm changed to 49.82, how to control them.

 

thanks very mcuh

 

Eric

[Matthew Hajicek - Singularity]

You may need to rough machine and then finish machine it to let the material move where it wants to. Of course you know that with plastic your tools should be razor sharp.