because it allows the operator to wrap his thumb
around the forefinger and effectively maximize the
strength in his right hand. This design feature affords
the operator greater control of the machine when
counteracting the effects of torque and kickback during
the digging process.
4) The Hole Digger is designed to utilize the General
Equipment Company PN 2121 Auger Pin to retain the
earth auger to the transmission driveshaft. This pin is
not intended to shear and absorb kickback related
forces when the earth auger comes in sudden contact
with a buried object. The pins are utilized for the
following reasons:
a) Such an occurrence (pin shear) would result in
extensive physical damage to the driveshaft and auger
drive hub.
b) Even if the physical damage to the Hole Digger
could be eliminated and/or minimized from the actual
process, it could require an unknown (and potentially
large) number of auger pins to complete the digging
process for any specific hole.
c) Even if the cost of replacement auger pins is not a
factor, the resulting productivity produced by the actual
process would not be deemed acceptable by industry
and/or social standards for the Hole Digger.
d) Given the infinite number of soil conditions which
could be encountered during the actual process, it is
impossible to design and supply a specific auger pin to
shear at a specific torque value which would produce
acceptable operational results for the Hole Digger.
e) Given the infinite number of potential operators and
their methods utilized during the actual process, it is
impossible to design and supply a specific auger pin to
shear at a specific torque value which would produce
acceptable operational results for the Hole Digger.
f) Given the infinite number of combinations of soil
conditions, auger diameters, auger boring head
conditions, digging depths, mechanical operating
conditions, operators and operator methods
encountered during the actual process, it is impossible
to design and supply a specific auger pin to shear at a
specific torque value which would produce acceptable
operational results for the Hole Digger.
5) For comparison purposes, it is interesting to note
that portable electric drills do not utilize any torque
limiting or clutch device to allow the drill bit to slip at
any specific torque value for drilling purposes. As with
a Hole Digger, such a device would make the drill a
useless tool because of the infinite number of potential
operating configurations and the inability to design
specific components to meet the requirements of each
operating configuration.
6) Many portable electric screwdrivers incorporate a
torque limiting or clutch device which allows the
operator to preset the torque output of the tool to a
specific value. This is especially useful and desirable
when hardware can be secured to specific torque
values according to industry published standards.
7) Portable electric drills and screwdrivers are two
separate tools designed for different and specific job
applications. The drilling process has different
requirements than the fastening process offered by
screwdrivers. The operational characteristics of
portable electric screwdrivers can not be confused
and/or substituted for the operational characteristics of
the Hole Digger.
OPERATING THE HOLE DIGGER CONTINUED.
Application: All 200 Series models.
5) Auger boring heads are designed for digging in a
wide variety of soil types and/or conditions. Each
boring head design represents a compromise in overall
digging efficiency, productivity and service life for any
given soil condition. As a general rule, pressing down
on the operator handle is not required to initiate and/or
sustain the digging process. In most soils of moderate
Proctor Densities, augers will dig at rates that will not
cause the centrifugal clutch to overload and slip. In
most soft soils of low Proctor Densities (sandy, etc.), it
may be necessary to hold up on the operator handle to
reduce the digging rate of the auger. The natural
tendency of any auger design, in low Proctor Density
soil conditions, is to dig at a rate which causes the
centrifugal clutch to overload and slip. In most hard
soils of high Proctor Densities (hard clay, etc.), it may
be necessary to press down on the operator handle to
establish and maintain acceptable digging rates.
Proper digging procedure for any given soil condition is
the accumulation of actual experience, skill and
240H ONE MAN HOLE DIGGER
FORM GOM14081201, VERSION 1.1
24
To Next Page
Loading...
