SUPREMA-P Pneumatic Valve Seat Milling Machine -

The pneumatic valve seat milling machine is used to machine and recondition valve seats in engine cylinder heads. The SUPREMA-P works with seats from Ø0.7 to 2.4 inches (Ø18 to 60mm), using pneumatic motor of 20-80 RPM with compressed air at 87 PSI (6 Bar). It's essential in engine rebuilding to ensure perfect sealing between valve and seat, preventing compression loss and valve burning. It replaces manual boring work, delivering superior precision and finish.

The pneumatic boring machine SUPREMA-P accepts cylinder heads up to 45.3 x 17.7 inches (1,150 x 450 mm) maximum length and width on the fixture table. The distance between cylinder head support base and chuck is 9.1 inches (230 mm), allowing work with considerable height cylinder heads. The chuck has maximum 12° inclination, handling cylinder heads with inclined base. These dimensions cover most automotive engines, from passenger cars to medium trucks.

The milling machine allows milling valve seats from Ø0.7 to 2.4 inches (Ø18 to 60mm) diameter. It comes with 3 specific tool holder capsules: N°2000 for Ø0.7-1.2 inches (Ø18-30mm), N°2001 for Ø0.9-1.6 inches (Ø22-40mm) and N°2002 for Ø1.5-2.4 inches (Ø38-60mm). It also includes 6 seat milling tools and 11 hardened pilot shafts in diameters from 0.275 to 0.432 inches (6.98 to 10.97mm). This range covers intake and exhaust valves from most engines, from motorcycles to medium industrial engines.

The pneumatic boring machine like the SUPREMA-P offers smoother and more constant torque control, ideal for fine finishing of seats. It works with compressed air at 87 PSI (6 Bar), generating less vibration than electric motors. The variable speed of 20-80 RPM allows precise adjustment according to material and tool. Electric machines have more raw power, but less fine control. For professional seat rebuilding, the pneumatic system offers better finish quality and tool life.

The process uses pilot shaft that enters the valve guide to center the tool. The cutting tool rotates at 20-80 RPM by pneumatic motor, milling the seat with manual feed of 0.6 inches (15mm) stroke. The magnetic system fixes the tool holder shaft with 0.024 hp. The machine includes tool sharpener with Ø2.8 inches (Ø70mm) diamond wheel. Compressed air at 87 PSI (6 Bar) ensures constant rotation and precise finish, removing damaged material and creating new sealing surface.

Basic maintenance includes daily cleaning of pneumatic system, air pressure verification at 87 PSI (6 Bar) on installed regulator, and pilot shaft cleaning after use. Tools must be regularly sharpened on integrated sharpener with diamond wheel. Periodically check the 0.024 hp magnetic system and replace vacuum pump seals as they wear. Pneumatic motor consumes 26.5 CFM (0.75 m³/minute) and has long service life if clean, dry air is maintained. Pneumatic lubrication according to manual.

The SUPREMA-P is quoted on demand, and pricing varies with each customer's needs, including accessories, tooling and optional features. With in-house technology developed by Chinelatto in Brazil since 1962, you can count on responsive support from our technical team. Spare parts: many are kept in stock and the others are manufactured within a reasonable lead time. Request a quote at chinelatto.com.br/contact — our sales team will contact you very soon.