MACHINE GUARDING Part 1 General Machine Safety Definitions

MACHINE GUARDING Part 1 – General Machine Safety

Definitions Ø Point of operation - area of the machine where work is performed Ø Power transmission - all components of the mechanical system that transmit energy, such as flywheels, pulleys, belts, and gears Ø Operational controls – levers, buttons, and other means of controlling machine functions

Point of Operation Ø Should always be guarded. Ø Guards: • appropriately designed and sized • clean and in good condition Ø Shields must be used if the point of operation cannot be fully guarded.

Power Transmission Ø Moving parts less than 7 ft. above the floor or platform must be completely enclosed with a barrier guard Ø If a metal guard is used, it should be painted yellow to indicate caution

Power Transmission unguarded belt clip-on shield unguarded draw bar

Power Transmission

Operational Controls Ø Ø Ø Ø Easy to read Properly color-coded Include an E-stop Accessible without reaching over rotating or dangerous part. A separate set for each operator Recessed buttons reduce the risk of inadvertent activation Foot pedals must be enclosed

E-Stops Ø Easy way to shut-down a machine Ø Stop all hazardous motions immediately Ø Prevent machine restart when power is back on Ø Must be easily accessible Ø One E-stop for each operator

Power-interrupt chuck key Prevents machine operation if the plug is disconnected

Additional Safety Considerations Ø Work piece - secured to prevent fly-off Ø Electrical wiring - in good condition Ø Equipment stability – anchored to the floor Ø Other hazards - any moving parts outside the point of operation

Control of Stock & Work Piece Ø Guarded entry and exit points Ø Work table has means to secure the work piece Ø Tool rest area is present Ø Eject mechanism

Clearing Chips, Scraps & Jams Ø Ø Use tools designed for each task & machine Compressed air pressure – 30 psi or less Use only OSHA-compliant air guns Wear your safety glasses Ø Do NOT reach into a machine to clear jams!

Other Hazards Ø Eject mechanism – guarded? Ø Feed-line components – guarded? Ø Chuck key – removed? Ø Chip conveyor – guarded? Ø Unused portions of blades and wheels – guarded?

Unguarded Feedline nip point sharp edge

Guarded Feedline

no shield Light Bulbs Ø Use shatter-resistant shields Ø Avoid compact fluorescent bulbs § They break easily § Can release mercury, which is toxic

Electrical Wiring and Components Ø Properly enclosed and insulated Ø In good condition Ø Strain-relief in place where wires bend Ø Flexible electrical cords must not be used to power stationary machines

Anchoring Machines Ø Prevents tipping or falling over Ø Required for equipment designed for fixed location Bolt it to the floor!

Hazardous Energy – Lockout/Tagout Ø “authorized” employees • have special training • allowed to lockout/tagout a machine Ø “affected” employees • all other machine operators • must be informed when a machine is locked out

Is this safe? wood block NO! wood blocks compress & can explode under pressure

Questions?

End of Part 1 General Machine Safety