If you have the CNC machining skills or access to CNC machine service, you can start with these blank or pre-machined sample molds.
Dimensions: 4.8"W x 6.0"H x 2.0"D. Alignment pins are included.
In order to design the mold successfully, there are some design guidelines to follow.
When you design a mold for more than one parts (multi-cavity), the part distribution should be so balanced that each part is placed at equal distance to the sprue. That allows the mold flow smooth and consistent.
Runner and Gate Design
The runner should be thick enough to carry high amount of plastics without early premature cool down. The gate should be thin enough to have a smooth plastic flow into the cavity.
Wall thickness and design determine if a part would have a sink or wrap after the injection molding or not. Uneven mold wall thickness is always a problem. Certain materials should also have a minimum thickness for a perfect mold-ability.
Draft Angle and Corners
2-3 degrees draft is required for mold-ability of the parts. The angle should be large enough to allow to eject the part out of the mold. The corners should NOT be too sharp. Otherwise sink marks may occur.