Abstract: An adjustable gage cutter scraper system is provided to clear a path through fallen rock and muck in a tunnel invert. The scraper system protects the gage cutters from recutting or regrinding the rock and muck and thus prevents or retards excessive wear of the gage cutters. Scraper blades are positioned proximate the periphery of the rotary head immediately preceding the gage cutters. Retaining members on the rotary head restrain movement of the scraper blades in all directions other than radially from the central axis of the rotary head. Driver members on the rotary head are selectively used to move the scraper blades radially. The driver members adjust the position of the scraper blades relative to the tunnel wall, thereby compensating for blade wear and maintaining effective protection for the gage cutters.