Post hole digger

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Contents

Executive Summary

Customer Needs and Stakeholders

Product Function/Evaluation

Assembly

Part Number Name Qty. Weight Function Material Maunfacturing Process Image
S1 Wooden handle 2 33.1 oz Allows user to operate tool Wood (Pine) Automated CNC turning
S2 Carriage Bolt 4 0.7 oz Attaches wooden handle to digging head Steel Upset forging
S3 Large washer 4 0.1 oz Prevents carriage bolt head from being embedded in wooden handle Steel Stamping
S4 Digging head 2 22.5 oz Provides means of digging into dirt, sizing the hole, and removing dirt Steel Stamping
S5 Pivot bolt 1 0.8 oz Joins two handle/digging head assemblies Steel Upset forging
S6 Sleeve 1 0.2 oz Protects pivot pin Steel Roll forming
S7 M8 washer 5 0.05 oz Increases surface area over which compressive force of the tightened bolt and nut is applied, placed between nut and and surface to prevent damage to surface when nut is tightened Steel Stamping
S8 M8 x 1.25 Lock nut with nylon insert 5 0.1 oz Threads onto bolt and tightened to join parts together. Nylon insert prevents nut from loosening Steel Forging
Part Number Name Qty. Weight Function Material Maunfacturing 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 surafce area for grip to attach over end of otherwise hollow handle Plastic Injection molding
C3 Fiberglass handle 2 -- Allows user to operate tool Fiberglass with protective coating  ?
C4 Wooden handle insert 2 -- Reinforces fiberglass handle where handle attaches to connecting arm Wood Automated CNC turning
C5 Connecting arm 2 -- oz Extends length of handle to digging head, bent to particular shape to allow for compund 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 tool is in the closed position 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

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Mechanical Analysis

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