R 408.12761 Sanding machines.

Rule 2761. Feed rolls of self-feed sanding machines shall be protected with a semi- cylindrical guard to prevent the hands of the operator from coming in contact with the in-running rolls at any point. The guard shall be constructed of not less than 18 gauge sheet metal or stronger material, preferably metal, and shall be firmly secured to the frame carrying the rolls to remain in adjustment for any thickness of stock. The bottom of the guard should come down to within 3/8 inch of a plane formed by the bottom or contact face of the feed roll where it touches the stock.