Subpart O Machine Guarding Basics Overview - Kevinian

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Subpart O Machine Guarding

Subpart O o o o o o o o o 1910.211 1910.212 1910.213 1910.215 1910.216 1910.217 1910.218 1910.219 Definitions General Requirements for all Machines Woodworking Machinery Abrasive Wheel Machinery Mills and Calendars Mechanical Power Presses Forging Machinery Mechanical Power-Transmission

Basics of machine safeguarding A good rule to remember is: o Any machine part; function; or process which may cause injury must be safeguarded.

Basic areas of safeguarding o The point of operation o Power transmission apparatus o Other moving parts (reciprocating, transverse, or rotating)

Motions o Rotating (including in-running nip points) o Reciprocating o Transverse

Nip points Nip point Nip point Nip point Nip point Nip point

In running nip points on rolls

Nip points A Typical nip points Nip point Nip point B Nip point C

Rotating hazards Burr Rotating shaft and pulleys with projecting key and set screw Rotating pulley with spokes and projecting burr on face of pulley Rotating coupling with projecting bolt heads

Pinch points caused by tables Table Bed (stationary)

Guarding table pinch points

Transverse motion of a belt Transverse motion of belt

Safeguarding Guards o Prevent access to the danger areas Devices o Control access to the point of operation

Actions o Cutting o Punching o Shearing o Bending

Different actions Stock Cutting tool

Guards o Fixed o Interlocked o Adjustable o Self-adjusting

Fixed guard on a bandsaw Wheel guard Blade guard Wheel guard

Fixed guard on a power press Stock entering danger zone Stock exit Transparent insert in front panel

Fixed guard enclosing belt and pulleys Inspection panel

Fixed guard on veneer clipping Guard

Fixed guard on a power squaring shear Blade guard Throat and gap guard

Ends and unused portion of press brake guarded o Power press brake (When used in a power press) o The requirements of 4123:1-5-10 o Shall be applicable to power press brakes when End of the used for other than bending operations guarded Transparent guard Mounting bolt

Adjustable guard on horizontal bandsaw Adjustment knob Guard Blade

Adjustable guard on power press Adjustable bars

Pedestal grinder Rotating wheels Adjustable stock rest Point of operation Stock Operating control (on/off switch) Note: Grinding wheels are usually enclosed as shown. Base

Portable grinders

Adjustable guard on bandsaw

Adjustable guard on table saw Crank for height adjustment Handle for extending or retracting guard over blade Saw blade Guard

Adjustable guard on wood shaper Nut for height adjustment Guard Base of shaper blade

Adjustable guard on router Adjustment nuts Guard Stock Base of router blade

Self-adjusting guard on radial arm saw Handle Guard Anti-kickback device Blade

Self-adjusting guard on circular saw Guard retracted Stock Blade Guard

Self-adjusting guard table saw First guard Second guard

Self-adjusting guard on jointer Guard in rest position Guard Stock

Awareness barrier on back side of shear Awareness barrier

Awareness barrier on stitching machine Awareness barrier

Shields on a drill press and lathe Transparent shield Lathe Drill

Devices o Presence sensing Photo-electrical Radio-frequency Electromechanical o Pullback o Restraint

Photoelectric presence sensing devices Sensing device Danger area Sensing device

Photoelectric presence sensing devices cont:

Photoelectric presence sensing device on press brake

Radio-frequency presence sensing device on press Antenna Capacitance field

Electromechanical sensing device on an eye-letter o Similar safety devices are utilized on: spot welders and riveters Rocker-arm welder Air-operated welder Probe in contact with fingers, machine will not cycle

Pullback device on a power press Danger area Pullback mechanism Wristband

Pullback device on a press brake Nylon pullback straps are attached to wristbands

Restraint device on a power press

Devices o Safety controls Safety trip control o Pressure-sensitive body bar o Safety triprod o Safety tripwire cable o Two-hand control o Two-hand trip

Pressure-sensitive body bar on rubber mill Bar

Safety triprod on a rubber mill

Safety tripwire cable on a calender Cable

Two-hand control buttons on a part-revolution clutch power press Control buttons

Two-hand trip buttons on a full-revolution clutch power press

Devices o Gates Interlocked Other o Location/distance

Horizontal injection molding machine with gate guards Gate Handle

Power press with gate guards Gate

Robot with fixed barrier guards Press Robot Stock conveyor Fixed barrier

Robot danger areas Danger area

Potential feeding and ejection methods to improve safety for the operator o Automatic feed o Semi-automatic feed o Automatic ejection o Semi-automatic ejection

Power press with automatic feed Transparent enclosure guard Stock feed roll Danger area Completed work Scrap material

Power press with chute feed Chute inclined as necessary for gravity feeding

Power press with sliding die Die stop Die slide Handle

Power press with sliding bolster Bolster in retracted position Die in stock placement or removal position (bolster in extended position)

Saw with auto indexing mechanism and traveling head Blade enclosure guards Stock Indexing mechanism

Holding tools Pliers with curved handles for two-handed usage Duckbill pliers Feeding tongs Vacuum-tongs for feeding positioning heavy formed parts Tong device used to tube or cup Right angle jaw tongs for handling flanged or cup shaped work pieces A lightweight tweeter made of steel springs Magnetic lifter “twist-off” Double magnet with release lever Double cup lifter with release button

Pushing devices Stock Push block

Five concerns on any machine o Safeguarding - guard, device, method o Controls - control reliability o Disconnect - lockable in off position o Starter - magnetic (for drop-out protection) o Covers - rotating components covered to 7ft. from floor or from working platform.

Safety blocks installed on power presses Safety block

Lockout devices required for all machines

Subpart O Machine Guarding. Subpart O o 1910.211 Definitions o 1910.212 General Requirements for all Machines o 1910.213 Woodworking Machinery o 1910.215 Abrasive Wheel Machinery o 1910.216 Mills and Calendars o 1910.217 Mechanical Power Presses o 1910.218 Forging Machinery o 1910.219 Mechanical Power-Transmission .

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One or more methods of machine guarding shall be provided to protect employees from hazards such as those created by (29 CFR 1910 Subpart O - Machinery and Machine Guarding): - Point of operation - Nip points - Rotating parts - Flying chips - Sparks Examples of guarding methods - Physical barrier guards including distance

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