Lead-screw post hole digger
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List of Parts
Table *****: Individual Components of Redesigned Post Hole Digger
Part Number
Name
Qty.
Weight
Function
Material
Manufacturing Process
Image
Dimensioned Drawing
Vendor Info
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
Steel
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
Transmits 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
18
1/4" Nylon Lock Nut
3
NA oz
Nut for both
shovel link bolts
and the
central rod bolt
Steel
Upset forging
19
5/16" Nylon Lock Nut
1
NA oz
Nut for
shovel pivot bolt
Steel
Upset forging
Quality Function Deployment
Insert QFD here
Mechanical Analysis
Include both new and old Mechanical Analysis.
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