Multiple gates often are preferable and are necessary for large parts.
Gates should feed into thick sections of castings.
A fillet should be used where a gate meets a casting; this feature produces less
turbulence than abrupt junctions.
The gate closest to the sprue should be placed sufficiently far away so that the gate
can be easily removed.
The minimum gate length should be three to five times the gate diameter, depending
on the metal being cast.
Curved gates should be avoided, but when necessary, a straight section in the gate
should be located immediately adjacent to the casting.