Lead-screw post hole digger

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(→'''List of Parts''')
(→'''List of Parts''')
Line 127: Line 127:
| style="text-align: center;" | 13
| style="text-align: center;" | 13
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| U-bolt
 
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| style="text-align: center;" | 2
 
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| style="text-align: center;" | NA oz
 
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| Bolts down the ''crank'' to the ''base plate''
 
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| T 6061 Aluminum
 
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| Upset forging
 
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| [[Image:Complex_post_hole_digger_small_washer.jpg|100px]]
 
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|-
 
-
 
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| style="text-align: center;" | 14
 
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| Base plate
 
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| style="text-align: center;" | 1
 
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| style="text-align: center;" | NA oz
 
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| Provides a location to rigidly attach ''lead screw'' to operating mechanism so a turn of the ''crank'' will produce linear motion of the ''central rod'', as well as bolting down the ''crank'' using the ''U-bolts''
 
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| T 6061 Aluminum
 
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| Stamping
 
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| [[Image:Complex_post_hole_digger_small_washer.jpg|100px]]
 
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|-
 
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| style="text-align: center;" | 15
 
| Shovel pivot bolt
| Shovel pivot bolt
| style="text-align: center;" | 1
| style="text-align: center;" | 1
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|-
|-
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| style="text-align: center;" | 16
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| style="text-align: center;" | 14
| Shovel link bolt
| Shovel link bolt
| style="text-align: center;" | 2
| style="text-align: center;" | 2
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|-
|-
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| style="text-align: center;" | 17
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| style="text-align: center;" | 15
| Central rod bolt
| Central rod bolt
| style="text-align: center;" | 1
| style="text-align: center;" | 1
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|-
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| style="text-align: center;" | 18
 
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| Hairpin cotter pin
 
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| style="text-align: center;" | 1
 
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| style="text-align: center;" | NA oz
 
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| Connects ''lead screw'' to ''base plate''
 
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| Steel
 
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| Extrusion/Bending
 
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| [[Image:Complex_post_hole_digger_connecting_bolt.jpg|100px]]
 
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|-
 
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| style="text-align: center;" | C11
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| style="text-align: center;" | 16
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| Bushing
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| Link bushing L
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| style="text-align: center;" | 1
+
| style="text-align: center;" | 2
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| style="text-align: center;" | 0.7 oz
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| style="text-align: center;" | NA oz
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| Used to align two Connecting arms and create a low friction surface for Connecting arms to pivot about
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| Bushing for ''shovel link bolt'' to maintain correct spacing between ''shovel link'' and ''shovel'' in the large gap
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| Brass
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| Plastic (PTFE)
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| Roll forming
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| Injection molding
| [[Image:Complex_post_hole_digger_bushing.jpg|100px]]
| [[Image:Complex_post_hole_digger_bushing.jpg|100px]]
|-
|-
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| style="text-align: center;" | C12
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| style="text-align: center;" | 17
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| Plastic spacer
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| Link bushing S
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| style="text-align: center;" | 1
+
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| style="text-align: center;" | 0.05 oz
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| Placed concentric with Bushing between two connecting arms to provide low friction surface and prevent the arms from wearing against one another
+
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| Plastic
+
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| Injection molding
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| [[Image:Complex_post_hole_digger_plastic_washer.jpg|100px]]
+
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|-
+
-
 
+
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| style="text-align: center;" | C12
+
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| Scissor pin bolt
+
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| style="text-align: center;" | 1
+
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| style="text-align: center;" | 0.3 oz
+
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| Joins two handle assemblies together, passes though Bushing to create main joint around which handles pivot
+
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| Steel
+
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| Upset forging
+
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| [[Image:Complex_post_hole_digger_scissor_pin.jpg|100px]]
+
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|-
+
-
 
+
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| style="text-align: center;" | C13
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| M10 washer
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| style="text-align: center;" | 1
+
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| style="text-align: center;" | 0.1 oz
+
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| 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
+
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| Steel
+
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| Stamping
+
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| [[Image:Complex_post_hole_digger_large_washer.jpg|100px]]
+
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|-
+
-
 
+
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| style="text-align: center;" | C14
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| M10 lock nut with nylon insert
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| style="text-align: center;" | 1
+
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| style="text-align: center;" | 1.3 oz
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| Threads onto scissor pin bolt and tightened to join connecting arms together. Nylon insert prevents nut from loosening
+
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| Steel
+
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| Forging
+
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| [[Image:Complex_post_hole_digger_large_locknut.jpg|100px]]
+
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|-
+
-
 
+
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| style="text-align: center;" | C17
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| Digging head pivot bolt
+
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| style="text-align: center;" | 1
+
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| style="text-align: center;" | 0.8 oz
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| Connects two digging heads together, creates pivot point around which digging heads open and close
+
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| Steel
+
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| Upset forging
+
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| [[Image:Complex_post_hole_digger_center_pin.jpg|100px]]
+
-
|-
+
-
 
+
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| style="text-align: center;" | C18
+
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| Large plastic spacer
+
| style="text-align: center;" | 2
| style="text-align: center;" | 2
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| style="text-align: center;" | 0.1 oz
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| style="text-align: center;" | NA oz
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| Placed on pivot bolt to align two digging heads and protect pivot bolt
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| Bushing for ''shovel link bolt'' to maintain correct spacing between ''shovel link'' and ''shovel'' in the small gap
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| Plastic
+
| Plastic (PTFE)
| Injection molding
| Injection molding
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| [[Image:Complex_post_hole_digger_large_plastic_spacer.jpg|100px]]
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| [[Image:Complex_post_hole_digger_bushing.jpg|100px]]
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|-
+
-
 
+
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| style="text-align: center;" | C19
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| Small plastic spacer
+
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| style="text-align: center;" | 1
+
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| style="text-align: center;" | 0.05 oz
+
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| Placed on pivot bolt to align two digging heads and protect pivot bolt
+
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| Plastic
+
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| Injection molding
+
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| [[Image:Complex_post_hole_digger_small_plastic_spacer.jpg|100px]]
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|-
|-
|}
|}

Revision as of 00:44, 1 December 2008

List of Parts

Table *****: Individual Components of Redesigned 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 T 6061 Aluminum Extrusion
2 Central rod 1 NA oz Transmits rotational motion of lead screw into translational motion, forcing shovels closed T 6061 Aluminum Extrusion
3 Crank 1 NA oz Turned by user to close shovels T 6061 Aluminum Extrusion
4 Shovel 2 NA oz Contain dirt when digging Steel Stamping
5 Shaft handle 2 NA oz Provides gripping location for ground penetration strike and location for applying counteractive moment to shaft when turning crank to close shovels T 6061 Aluminum Extrusion
6 Shaft peg 4 NA oz Allow user to force tool into the ground using his/her foot T 6061 Aluminum Extrusion
7 Guide bushing 2 NA oz Constrains central rod to maintain linear motion within shaft T 6061 Aluminum Extrusion
8 Lead screw 1 NA oz Transmits rotation of crank into translation of central rod Steel Automated CNC lathe/threading machine
9 Lead screw nut 1 NA oz Constrains lead screw Brass Automated CNC milling
10 Lead screw nut bushing 1 NA oz Constrains lead screw nut and locates it within shaft T 6061 Aluminum Lathe???
11 Inline ball joint 1 NA oz Translates rotation of lead screw to translation of central rod and connects the two parts Steel  ???
12 Shovel link 2 NA oz Connects central rod to shovels T 6061 Aluminum Extrusion
13 Shovel pivot bolt 1 NA oz Joins center of the two shovels, allowing them to pivot about it as a central axis Steel Upset forging
14 Shovel link bolt 2 NA oz Joins each respective shovel to its shovel link Steel Upset forging
15 Central rod bolt 1 NA oz Joins central rod to the two shovel links as a loosely pinned connection Steel Upset forging
16 Link bushing L 2 NA oz Bushing for shovel link bolt to maintain correct spacing between shovel link and shovel in the large gap Plastic (PTFE) Injection molding
17 Link bushing S 2 NA oz Bushing for shovel link bolt to maintain correct spacing between shovel link and shovel in the small gap Plastic (PTFE) Injection molding
Retrieved from "http://wiki.ece.cmu.edu/ddl/index.php/Lead-screw_post_hole_digger"
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