topic Re: FIXC Card in Netfabb Forum

FIXC Card

mario.sercer — Sat, 02 Apr 2022 15:16:14 GMT

Hello,

I have a question to Example 3 - Advanced Part Scale Modeling.

Why the substrate was fixed at point 55,55 (as shown on the images https://ibb.co/0jNSZR9 and https://ibb.co/7VKCTvP) and not somewhere in the middle of the substrate?

Does it matter where the position of the FIXC is or that point can be anywhere inside the substrate?

How can I simulate the bolt release fixture (for example build plate in the EOS 290 machine)? Should I set up four fixed points in a specific location?

Thanks for help,

best regards

Mario

Re: FIXC Card

michael.gouge — Mon, 04 Apr 2022 19:45:20 GMT

Hey Mario,

The coordinates for the circular fixture for this example is arbitrary. It was chosen to show the use of the *FIXC card rather than illustrating best practices. For your own simulations you should mimic exactly.

As for simulating bolt release unfortunately there are no combinations of cards which allow both user specified boundary conditions using any of the *FIX?, *FiX, *FiSR etc cards and *FSUB which turns on substrate release simulations, so you have to choose between simulating your constraints exactly, or simulating bolt release. However, for commercial machines like an EOS 290, the pre-programmed *FSUB option has been shown through dozens of experimental studies to capture post process distortion accurately - just don't forget to also enable part-scale plasticity, via the *PPLA card, otherwise the simulations will end up with some very large predictions for build plate distortion after bolt release.

Re: FIXC Card

mario.sercer — Tue, 05 Apr 2022 11:11:41 GMT

Hello Michael,

thank you very much for the very precise explanation,

best regards

Mario