DESIGN DATA ON PRODUCTION METHODS 



269 



Fillets: 



Avoid sharp corners if possible. 

 Finishes : 



Alumilite finish best on alloy 218. Colored alumilite best in darker shades. May be plated with common plating 

 metals if desired. 

 Design to aid trimming: 



Design part so that flashes will be in or parallel to main parting plane. 

 Cast threads: 



Internal threads — best to cast threaded insert. 



External threads — can be cast and need only light chasing to finish. 



* Through the use of a low-temperature annealing treatment, alloy 23 can be made virtually stable in dimensions, 

 t Dies for casting the low melting point alloys are least expensive and have longest life. 



} Includes polishing and buffing expense as well as ease of applying all types of commercial finishes, both electro- 

 deposited and organic. 



§ Based on die, material, and fuel costs, production speed, and machining and finishing costs. 



