Table 4.2: Individual Components of Complex Post Hole Digger
Part Number | Name | Qty. | Weight | Function | Material | Manufacturing Process | Image
|
1
| Shaft
| 1
| NA oz
| Constrains inner parts of tool and handles physical stresses of digging, etc.
| T 6061 Aluminum
| Extrusion
|
|
2
| Guide bushing
| 2
| NA oz
| Constrains central rod to maintain linear motion within shaft
| T 6061 Aluminum
| Lathe???
|
|
3
| Central rod
| 1
| NA oz
| Transmits rotational motion of lead screw into translational motion, forcing shovels closed
| T 6061 Aluminum
| Extrusion
|
|
4
| Lead screw
| 1
| NA oz
| Transmits rotation of handle into translation of central rod
| Steel
| Automated CNC lathe/threading machine
|
|
5
| Lead screw nut
| 1
| NA oz
| Constrains lead screw
| Brass
| Automated CNC milling
|
|
6
| Lead nut bushing
| 1
| NA oz
| Constrains lead nut and locates it within shaft
| T 6061 Aluminum
| Lathe???
|
|
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
|
|