mod 1.0 Flashcards
safeguarding any machine part that may cause injury
machine safety
machine accidents is cause by? (4)
-unwated contact with the machine
-something flying with the machine
-machine malfunction
-workpiece movement
effects of machine related accidents (4)
-can result to severe injuries
-loss of trained employees
-loss in productivity
-damage equipment
where mechanical hazards occur? (3)
-point of operation
-other moving parts
-power transmission
that point where work is performed on the material, such as cutting, shaping, boring, or forming.
point of operation
all components of the mechanical system that transmit energy to the part of the machine performing the work.
power transmission apparatus
these components include flywheels, pulleys, belts, connecting rods, couplings, cams, spindles, chains, cranks, and gears.
power transmission apparatus
turning around on an axis or center
rotating
the back and forth movements of a machine part
reciprocating
continuous straight line motion of a machine element in either direction
traversing
in-running nip ponts draw objects in and the effect is —————?
crushing or shearing injury
between rotating part and tangentially moving part
pinch points
cutting hazards from rotating parts (3)
-caught by
-flying particles
-sparks
during the back-and-forth or up-and-down motion, a worker can be struck by a moving part of caught between a moving and a stationary part. these are normally referred to as ——————————–?
pinch points or caught-between hazards
this motion is hazardous due to continuous straight line action and in-running nip points.
traversing motion
methods o machine safeguarding (guards) -3
-fixed
-interlocked
-adjustable
2 types of adjustable
-manually adjustable
-self-adjusting
methods of machine safeguarding (devices) -4
-presence sensing device
-pullback device
-restraint device
-safety control devices
3 type of safety control devices
-tripwire cable
-two-hand control
-emergency stop button
are barriers that prevent entry of an individual’s hands or other body parts into a hazard area.
guards
this type of guard is attached to a fixed surface and encloses the hazard.
fixed barrier guard
when in place, it prevents anyone from going over, around, under, or through it to the hazard. the principal advantage of the fixed enclosing guard is that it always prevents access to the hazard area.
fixed barrier guard
this type prevents machine motion until the guard is moved into place.
movable guards with interlocking switches
this type This type of guard can be positioned to accommodate a variety
of operations or work and when properly adjusted provides
adequate protection from the hazard at the point of operation.
adjustable guard
Provides a barrier which moves according to
the size of the stock entering the danger area.
self-adjusting guard
Requirements for Machine Guards
Safeguards must meet these minimum general requirements: -6
•Prevent employee contact with hazardous moving parts
•Secured and durable
•Prevent falling materials into moving parts
•Create no new hazards
•Must not interfere with worker productivity
•Should allow for proper and safe lubrication
Any mechanical or electrical devices designed to
protect a worker’s hands or other body parts from
coming into contact with a hazardous motion of a
machine.
safety devices
are cable and wristlet systems tha t
attached to an operator’s hands and to the machine’s moving
slide or ram, or to a fixed object away from the point of
operation. They are usually used on machines having
reciprocating motions.
pullbacks and restraint devices
are operator controls that require an
operator to hold both controls down during the hazardous
portion of the machine’s stroke.
two-hand control
These are designed, constructed, and arranged to create a
sensing field, area, or plane that will detect in its field the
presence of an opaque object.
presence sensing devices
Provides some protection from flying
particles, splashing cutting oils or coolants
protective shields
The standard for the control of hazardous
energy sources which covers maintenance
of machines in which the unexpected start
up of machines or release of stored
energy could cause injury to employees.
lock-out / tag-out system or loto
the uncontrolled current
and voltage in electrical circuits
electrical
exposed crushing or
cutting parts of equipment or loose
parts
mechanical
such as steam or due to
chemical reaction
thermal
stored energy that may be
due to gravity, hydraulics, pneumatics,
vacuum or springs
potential
A device that utilizes a positive means such as a lock
either key or combination type, to hold an energy isolating
device in the safe position and prevents the energizing of a
equipment
lockout devices
nIncluded are blank flanges
lockout devices
nA warning device, such as a tag and a means of attachment
tagout devices
nCan be securely fastened to an energy isolating device in
accordance with an established procedure to indicate that
the energy isolating device and the equipment being
controlled can not be operated until the tag is removed
tagout devices
sequence of lockout -6
-notify
-identify
-deactivate
-application
-dissipated
-verify
removal of lockout -4
-ensure
-check
-notify
-remove
