Hello, I am making an injection molding machine for fun. There is a lack of available information regarding the details of how the process works. There is something call the Lyman extruder that uses a wood auger bit as the injection screw. This auger is shaped much differently than the injection screws selling on alibaba. 1. How does the screw purge air? 2. How does the mold purge air without creating flash clogging the vent? 3. How do I calculate the needed pressure to fill a mold? (using melt flow index, gate size, and temperature) 4. How do I calculate the pressure a screw can generate on a fluid? (given X torque) Thank you for your help! *Disclaimer: this project is for fun, I know there's easier ways to do it like a plunger or 3d printer or resin casting. I currently do resin casting and 3d printing and such but I am obsessed with having an automated injection molder even if it can only make tiny parts and doesn't work very well.