First We need to know what material you would like to mold. The Shrink is based on that. As I remember Aluminum shrink was .022 inch per inch but I need to confirm that before using it.
I sample modeled a rim and got a weight of .5 KG so that size is quite small from my design. Gates add size very quickly so don't forget this in your caculations.
Water lines... this is quite the subject, In short you want to cool the part by adding evenly spaced lines around the entire cavity. NONE closer or FURTHER away from the cavity, even consistent distance is a simple key in water lines. After this and again simple explanation here, you want to cool the mass of the mold steel in your case H13 "Steel". Most mistakes are to try to cool the molded part or to get the water closer to the cavity and away from the steel. If you get closer or further from any wall of the cavity you are molding you are going to have problems.
H13 is a excellent steel for fairly long runs, I would first cut into "REN-wood" untill you get a good tool path, because of costs.  |