Casting Study: Miter Gear Box – Hunter Douglas Venetian Blind

Major Selection Criteria: Dimensional Precision, Mechanical Properties, Net Shape
Alloy: Zamak 3 (ZL3, ZL0400, ZnAI4, alloy 3)
Application Field: Builders Hardware
Application Size: Housing - 12.7 mm sq.
Surface Finish: As-Cast
Casting Technique: Pressure Die Casting
Source: Hunter Douglas

gearbox2_photo2_caseID129A four-piece miter gear assembly utilized zinc die casting for strength and precision. Both pinion gear shafts and housing halves are die cast net-shape, achieving full functionality without a cost penalty compared to alternative designs (thermoplastic housing/gears or thermoplastic housing/metal gears). In addition, this all-metal assembly is perceived by customers as being stronger than plastic/metal assemblies.