Cluster for and method of casting golf club heads

A method of casting a body of a golf club head made of titanium or a titanium alloy, the method comprising:

• rotating a casting cluster at a rotational speed of at least 550 rotations-per-minute (RPM), wherein the casting cluster comprises:
• a receptor;
• a plurality of runners coupled to the receptor and configured to receive molten metal from the receptor;
• at least twenty-eight main gates, wherein at least two of the main gates are coupled to each of the runners and each main gate is configured to receive molten metal from a corresponding one of the plurality of runners;
• and
• at least twenty-eight molds, wherein:
• at least two of the at least twenty-eight molds are coupled to each one of the plurality of runners via respective main gates of the at least twenty-eight main gates;
• each mold of the at least twenty-eight molds is configured to receive molten metal from a corresponding one of the main gates;
• each mold of the at least twenty-eight molds is configured to cast a body of a golf club head that has a volume of at least 100 cm3, a mass between 0.10 kg and 0.18 kg, a crown opening that occupies at least a majority of a crown portion of the body, and a face opening in a face portion of the body;
• and
• each mold of the at least twenty-eight molds is configured to cast a body of a golf club head that has a volume of no more than 250 cm3;
• while rotating the casting cluster, introducing a molten titanium-based metal into a casting cluster;
• while rotating the casting cluster, flowing the molten titanium-based metal through the plurality of runners, through the at least twenty-eight main gates, and into the at least twenty-eight molds;
• and
• producing a cast-product yield of at least 80%.

A casting cluster for casting a body of a golf club head made of titanium or a titanium alloy, the casting cluster comprising:

• a receptor;
• a plurality of runners coupled to the receptor and configured to receive molten metal from the receptor;
• at least twenty-eight main gates, wherein at least two of the main gates are coupled to each of the runners and each main gate is configured to receive molten metal from a corresponding one of the plurality of runners;
• and
• at least twenty-eight molds, wherein:
• at least two of the at least twenty-eight molds are coupled to each one of the plurality of runners via respective main gates of the at least twenty-eight main gates;
• each mold of the at least twenty-eight molds is configured to receive molten metal from a corresponding one of the main gates;
• and
• each mold of the at least twenty-eight molds is configured to cast a body of a golf club head that has a volume of at least 100 cm3, a mass between 0.10 kg and 0.18 kg, a crown opening that occupies at least a majority of a crown portion of the body, and an entirety of a face portion of the golf club head;
• wherein:
• each runner of the plurality of runners comprises a top surface and a bottom surface, which is opposite the top surface, and a proximal end, which is adjacent the receptor, and a distal end, which is opposite the proximal end;
• a first one and a second one of the at least twenty-eight main gates and a first one and a second one of the at least twenty-eight molds are coupled to each one of the plurality of runners between the proximal end and the distal end of the corresponding runner and coupled to the top surface of the corresponding runner;
• and
• a third one of the at least twenty-eight main gates and a third one of the at least twenty-eight molds are coupled to each one of the plurality of runners between the proximal end and the distal end of the corresponding runner and coupled to the bottom surface of the corresponding runner.