Little kids naturally understand how easily balls move around. They have a blast “swimming” through a sea of balls in a ball pit. For those of us that have not experienced that pleasure, the motion of a mass of ball is not intuitive. This is probably why it is sometimes hard to explain the benefit of creating a spherical grain structure.

Many die cast practitioners only have experience making small castings. This is because 800 ton die cast machines are what was historically found in die casting plants. Todays casting purchasers have discovered the cost advantage of combining multiple casting into one. According the castings have become larger. As always one of the challenges is getting the metal to the far end of the part before it solidifies. This is usually accomplished by rapid injection. As the fill path becomes longer it become necessary to use faster injection speeds. Faster injection speed causes flash and venting problems. I would rather use finesse. Rheocast metal with a spherical structure can be injected at 1/3 of the speed taking advantage of the way balls flow smoothly past one another. Any kid in a ball pit would understand this.