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Basic Scrubbing
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MIT Guide to Lockpicking
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Mechanical Skills
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Basic Scrubbing
At home you can take your time picking a lock, but in the
field
,
speed
is always
essential
. This
chapter
presents a
lock picking
technique
called
scrubbing
that can quickly
open
most locks.
The slow step in basic picking (
chapter 4
) is locating the pin which is binding the most. The force diagram (
Figure 5.1
) developed in
The Pin Column Modelchapter 5
suggests a fast way to select the
correct
pin to
lift
.
Assume
that all the pins could be characterized by the same
force
diagram
. That is, assume that they all bind at once and that they all
encounter
the same
friction
. Now consider the
effect
of running the
pick
over all the pins with a
pressure
that is great enough to
overcome
the
spring
and friction forces but not great enough to
overcome
the
collision
force of the key pin hitting the hull. Any
pressure
that is above the flat portion of the force graph and below the top of the
peak
will work. As the
pick
passes over a
pin
, the pin will
rise
until it hits the
hull
, but it will not enter the
hull
. The collision
force
at the
sheer line
resists
the
pressure
of the
pick
, so the pick rides over the pin without pressing it into the hull. If the proper
torque
is being applied, the
plug
will
rotate
slightly
. As the pick leaves the
pin
, the
key pin
will fall back to its initial position, but the
driver pin
will catch on the edge of the plug and stay above the
sheer line
. In theory one
stroke
of the pick over the pins will cause the
lock
to
open
.
In practice
,
at most
one
or two pins will
set
during a
single
stroke
of the
pick
, so several
strokes
are necessary. Basically, you use the pick to
scrub
back and forth over the pins while you adjust the amount of
torque
on the plug. The exercises in
chapter 8
will teach you how to choose the correct
torque
and
pressure
.
You will find that the
pins
of a
lock
tend to set in a particular order. Many factors effect this order (see chapter 9), but the primary cause is a
misalignment
between the
center
axis
of the
plug
and the
axis
on which the holes were drilled. If the axis of the
pin
hole
s is skewed from the center line of the plug, then the pins will set from
back
to
front
if the
plug
is turned one way, and from front to back if the plug is turned the other way. Many locks have this
defect
.
Scrubbing
is
fast
because you don't need to pay attention to
individual
pins. You only need to find the correct
torque
and
pressure
. Below, the steps of picking a lock by scrubbing are summarized. The
exercises
will teach you how to
recognize
when a pin is set and how to apply the correct
force
s. If a lock doesn't open quickly, then it probably has one of the
characteristic
s described in chapter 9 and you will have to
concentrate
on individual pins.
Insert the pick and torque wrench. Without applying any torque pull the pic out to get a feel for the stiffness of the lock's springs.
Apply a light torque. Insert the pick without touching the pins. As you pull the pick out, apply pressure to the pins. The pressure should be slightly larger than the minimum necessary to overcome the spring force.
Gradually increase the torque with each stroke of the pick until pins begin to set.
Keeping the torque fixed, scrub back and forth over the pins that have not set. If additional pins do not set, release the torque and start over with the torque found in the last step.
Once the majority of the pins have been set, increase the torque and scrub the pins with a slightly larger pressure. This will set any pins which have set low due to beveled edges, etc.
printable version
chaos
Mechanical Skills
MIT Guide to Lockpicking
The Pin Column Model
Bouncing the Pick
shower
individual
surface wash
Concentrate
Basic Picking and the binding defect
e
Absinthe
Identifying Set Pins
Cream of the Cool
carbonation
Pick
characteristic
Clean Coal Technologies
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