4.4.5 Types of Machine Guards
There are 4 general types of machine guards: fixed, interlocked, adjustable, and self-adjusting.
| Type | Safeguarding Action | Advantages | Issue |
| Fixed | Provides barrier | May be customized according to requirement Can be fabricated in-plantUsually provides maximum protectionNeeds lesser maintenanceSuits to high production, repetitive operations | May block worker visionCan be limited to specific operationsAdjustment/repair often require its removal, thereby necessitating other means of protection for maintenance personnel |
| Interlocked | Shuts off or disengages power and prevents starting of machine when guard is open | Usually provides maximum protectionAllows access to machine for removing jams without removing fixed guards | Requires careful adjustment and maintenanceJams may be easy to disengage |
| Adjustable | Provides a barrier that may be adjusted according to requirement | Can be constructed/adjusted to suit many specific applications | Hands may enter danger areaOften require frequent maintenance/adjustmentMay block worker vision |
| Self-adjusting | Provides a barrier that moves according to the size of the stock entering the danger area | Off-the-shelf guards are often commercially available | Does not always provide maximum protectionMay block worker visionUsually needs frequent maintenance and adjustment |
(Source: OSHA)