From DDL Wiki

Contents 1 Executive Summary 2 Customer Needs and Stakeholders 3 Product Function/Evaluation 4 Assembly 5 DFMA 6 FMEA 7 DFE 8 Mechanical Analysis

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 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 conecting 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

DFMA

FMEA

DFE

Mechanical Analysis