Lead-screw post hole digger

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Revision as of 20:24, 28 November 2008

Table 4.2: Individual Components of Complex Post Hole Digger

Part Number	Name	Qty.	Weight	Function	Material	Manufacturing Process	Image
C1	Grip	2	2.2 oz	Provides comfortable surface for gripping the tool, protects end of fiberglass handle	Plastic	Extrusion
C2	End cap	2	0.05 oz	Stiffens open end of fiberglass handle, provides surface area for grip to attach over	Plastic	Injection molding
C3	Fiberglass handle	2	11.9 oz	Allows user to operate tool	Fiberglass with protective coating	Pultrusion
C4	Wooden handle insert	2	4.2 oz	Reinforces fiberglass handle where handle attaches to connecting arm	Wood	Automated CNC turning
C5	Connecting arm	2	28.1 oz	Extends length of handle to digging head, bent to particular shape to allow for compound lever action for opening and closing digger heads	Steel	Roll forming, swaging, and bending
C6	Spacing bracket	1	1.9 oz	Maintains spacing of handles when the handles are pushed together	Steel	Stamping
C7	Handle bolt	4	0.7 oz	Attaches Fiberglass handle to Connecting arm	Steel	Upset forging
C8	Handle washer	6	0.2 oz	Increases surface area over which compressive force of Handle bolt is applied, protects Fiberglass handle from damage that would caused by tightening/rotating nut or bolt	Steel	Stamping
C9	M8 x 1.25 Lock nut with nylon insert	7	0.1 oz	Threads onto bolt and tightened to join parts together. Nylon insert prevents nut from loosening	Steel	Forging
C10	M8 washer	3	0.05 oz	Increases surface area over which compressive force of the tightened bolt and nut is applied, placed between nut and surface and/or bolt head and surface to prevent damage to surface when nut is tightened	Steel	Stamping
C11	Bushing	1	0.7 oz	Used to align two Connecting arms and create a low friction surface for Connecting arms to pivot about	Brass	Roll forming
C12	Plastic spacer	1	0.05 oz	Placed concentric with Bushing between two connecting arms to provide low friction surface and prevent the arms from wearing against one another	Plastic	Injection molding
C12	Scissor pin bolt	1	0.3 oz	Joins two handle assemblies together, passes though Bushing to create main joint around which handles pivot	Steel	Upset forging
C13	M10 washer	1	0.1 oz	Increases surface area over which compressive force of the tightened bolt and nut is applied, placed between nut and surface and/or bolt head and surface to prevent damage to surface when nut is tightened	Steel	Stamping
C14	M10 lock nut with nylon insert	1	1.3 oz	Threads onto scissor pin bolt and tightened to join connecting arms together. Nylon insert prevents nut from loosening	Steel	Forging
C15	Digging head	2	26.3 oz	Provides means of digging into dirt, sizing the hole, and removing dirt	Steel	Stamping
C16	Digging head connecting bolt	2	0.8 oz	Joins connecting arm to digging head, allows connecting arm and digging head to pivot	Steel	Upset forging
C17	Digging head pivot bolt	1	0.8 oz	Connects two digging heads together, creates pivot point around which digging heads open and close	Steel	Upset forging
C18	Large plastic spacer	2	0.1 oz	Placed on pivot bolt to align two digging heads and protect pivot bolt	Plastic	Injection molding
C19	Small plastic spacer	1	0.05 oz	Placed on pivot bolt to align two digging heads and protect pivot bolt	Plastic	Injection molding