Adjustable Guard
An adjustable guard is a physical barrier machine guard whose opening or position can be manually set to suit a particular operation and then remains fixed during that operation, preventing worker contact with hazardous moving parts. Recognized by OSHA as a primary guard type, it accommodates varying stock sizes while ensuring workers cannot reach the hazard under normal operation.
On the shop floor, adjustable guards are used on machines like band saws, table saws, drill presses, and milling machines where stock size or shape varies frequently. Operators or set-up personnel adjust the guard to the minimum opening needed for each job, securing it so it remains fixed during operation. These guards are often adjustable without tools, but require training and procedures to ensure safe use. Regular inspection for looseness or damage is critical, as vibration can cause settings to drift. In compliance programs, adjustable guards are tracked in safeguarding inventories with specific regulatory references and linked to training records and inspection checklists.
How do adjustable guards fit into OSHA 1910.212 requirements?
OSHA 1910.212(a)(1) requires machine guarding to protect operators from hazards like nip points and rotating parts. Adjustable guards are recognized as one of four guard types, provided they prevent bodily access to the hazard during normal operation, are securely attached, and are maintained so protection is complete at all times. Compliance requires that in its adjusted position, the guard meets the same performance requirement as any guard: no reachable exposure in normal use.
What does CSA Z432-16 expect from adjustable guards?
CSA Z432-16 requires adjustable guards to be designed so workers cannot reach hazardous zones during regular operations. If guards are adjustable or removable without tools, additional risk mitigation is expected, including operator training on correct adjustment, visual indicators for safe positions, and procedural controls like documented set-up steps and authorization for changes.
How does WorkSafeBC define 'guard' and treat adjustable guards?
WorkSafeBC's OHS Regulation Part 12 defines a guard as a physical barrier preventing a worker from reaching over, under, around, or through to a moving part or point of operation. While no separate definition for adjustable guard exists, guidance treats adjustable as a guard category that must be adjustable without tools while maintaining effective protection, always satisfying the requirement that workers cannot reach the hazard when in use.