Valve Seat Milling Cutter:
The valve milling cutters are used for manual re-facing and milling the seats of valves of engines, steam engines and pneumatic machines. This re-facing and milling is done during replacement or re-grinding of valves.
Bodies of the milling cutters are provided on one side with taper of 90 deg. (bevel of 45 deg.) with cut teeth, number of which varies according to diameter of cutter body The other side of the cutter body is straight and also provided with cut teeth. In the middle, the cutter body has a bore of 14 mm diameter (tolerance H7j, allowing the cutter to be slid in the ways of the guide. The guides of the valve milling cutters are provided on one side with a shank of different diameters and on the other side with hexagonal head of 17 mm for spanner, ways for cutter body of 14 mm diameter and thread M10 for screwing on of spanner.
The cutter bodies are made from tool steel. After cutting of teeth, the bodies are hardened to 58—62 HRc and sand blasted. The teeth are sharpened and periphery of the body ground. The guide sand spanner are machined and polished.