Lead-screw post hole digger

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(→'''List of Parts''')
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| style="text-align: center;" | C2
 
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| End cap
 
| style="text-align: center;" | 2
| style="text-align: center;" | 2
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| style="text-align: center;" | 0.05 oz
+
| Guide bushing
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| Stiffens open end of fiberglass handle, provides surface area for grip to attach over 
+
| style="text-align: center;" | 2
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| Plastic
+
| style="text-align: center;" | NA oz
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| Injection molding
+
| Constrains central rod to maintain linear motion within shaft
 +
| T 6061 Aluminum
 +
| Lathe???
| [[Image:Complex_post_hole_digger_handle_end_cap.jpg|100px]]
| [[Image:Complex_post_hole_digger_handle_end_cap.jpg|100px]]
|-
|-
-
| style="text-align: center;" | C3
+
| style="text-align: center;" | 3
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| Fiberglass handle
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| Central rod
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| style="text-align: center;" | 2
+
| style="text-align: center;" | 1
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| style="text-align: center;" | 11.9 oz
+
| style="text-align: center;" | NA oz
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| Allows user to operate tool
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| Transmits rotational motion of lead screw into translational motion, forcing shovels closed
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| Fiberglass with protective coating
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| T 6061 Aluminum
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| Pultrusion
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| Extrusion
| [[Image:Complex_post_hole_digger_fiberglass_handle.jpg|100px]]
| [[Image:Complex_post_hole_digger_fiberglass_handle.jpg|100px]]
|-
|-
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| style="text-align: center;" | C4
+
| style="text-align: center;" | 4
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| Wooden handle insert
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| Lead screw
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| style="text-align: center;" | 2
+
| style="text-align: center;" | 1
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| style="text-align: center;" | 4.2 oz
+
| style="text-align: center;" | NA oz
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| Reinforces fiberglass handle where handle attaches to connecting arm
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| Transmits rotation of handle into translation of central rod
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| Wood
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| Steel
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| Automated CNC turning
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| Automated CNC lathe/threading machine
| [[Image:Complex_post_hole_digger_wooden_handle_insert.jpg|100px]]
| [[Image:Complex_post_hole_digger_wooden_handle_insert.jpg|100px]]
|-
|-
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| style="text-align: center;" | C5
+
| style="text-align: center;" | 5
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| Connecting arm
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| Lead screw nut
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| style="text-align: center;" | 2
+
| style="text-align: center;" | 1
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| style="text-align: center;" | 28.1 oz
+
| style="text-align: center;" | NA oz
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| Extends length of handle to digging head, bent to particular shape to allow for compound lever action for opening and closing digger heads
+
| Constrains lead screw
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| Steel
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| Brass
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| Roll forming, swaging, and bending
+
| Automated CNC milling
| [[Image:Complex_post_hole_digger_connecting_arm.jpg|100px]]
| [[Image:Complex_post_hole_digger_connecting_arm.jpg|100px]]
|-
|-
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| style="text-align: center;" | C6
+
| style="text-align: center;" | 6
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| Spacing bracket
+
| Lead nut bushing
| style="text-align: center;" | 1
| style="text-align: center;" | 1
-
| style="text-align: center;" | 1.9 oz
+
| style="text-align: center;" | NA oz
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| Maintains spacing of handles when the handles are pushed together
+
| Constrains lead nut and locates it within shaft
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| Steel
+
| T 6061 Aluminum
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| Stamping
+
| Lathe???
| [[Image:Complex_post_hole_digger_spacing_bracket.jpg|100px]]
| [[Image:Complex_post_hole_digger_spacing_bracket.jpg|100px]]
|-
|-

Revision as of 21:31, 28 November 2008

List of Parts

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
Retrieved from "http://wiki.ece.cmu.edu/ddl/index.php/Lead-screw_post_hole_digger"
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