Peg 90 - Grinding valve seats from 40 to 90 mm Ø
Compression seal is one of the main factors which determine the efficiency of internal combustion engines. This makes the valves and their seats of fundamental importance and if they are worn the efficiency of the engine is reduced. PROPER RECONDITIONING SHOULD RESTORE SHAPE AND SYMMETRY, MAINTAINING THE ORIGINAL LOCATION OF THE VALVE IN ITS SEATING, ELIMINATING DRAG AND GUARANTEEING PERFECT SEAL DURING THE PROGRESSIVE WEAR OF THE ENGINE PARTS. THIS MAKES IT ESSENTIAL TO RESTORE:
ROUNDNESS : The seating must be perfectly round FLATNESS : All the contact surface points must be equally level ANGLE : The connection angle must be perfect
CONCENTRICITY : the seating must be concentrical to the axis of its guide and the shaft to the valve head VERTICLITY : the seating top must be vertical to the axis of the guide
precision : there must be maximum precision in the location of the valve in the seat, maintaining the specified tolerance and the original cone
To simplify these operations PEG Srl has patented a valve seat grinder which works by means of a BEVEL SYSTEM: THREE COMBINED SIMULTANEOUS GRINDING MOVEMENTS ON A SINGLE AXIS (pilot pin/valve guide) which ensures proper alignment.
The surface to be ground is then smoothed by a spring that turns on itself at high speed but that working tangentially.
Contemporary to the rotary motion, the whole system performs an eccentric movement. The grinding wheel to tap all points of the valve seat.
The pendulum movement, automatically creates the convergence angle between the valve and valve seat, as in a new engine.
The machine is built with high precision parts, reducing to a minimum errors due to slack in the connection of the components. The eccentric shaft is housed inside the motor shaft and has fixed eccentricity. Its supports are ground and the pilot pin hole is precision bored. The rotating parts are accurate by balanced and loaded to prevent axial or radial play on the bearings. The set of globoid screw gears is situated in the upper part of the machine with the micrometic feed register above it. The grindwheel spindle is ground. Strict control and testing are carried out to ensure that each machine is precision built to a high standard. To make provision for the range of engines currently available the regrinding system comprises a number of models to meet all requirements. Each machine is provided with a wide range of self-centering pilot pins and grindwheels complete with a dressing device. Each set is supplied in a metal box.PEG REGRINDING MACHINES ELIMINATE THE NEED FOR FINAL POLISHING OFF.
|Grinding wheel speed||8.000 Giri/Min.|
|Relative Motion||18 Giri/Min.|
|Eccentricity fixed||3 mm|
|Motor power||600 Watt|
|Phase voltage (Unless otherwise required)||220 Volt|
- Grinding Peg 90
- Protractor device support with diamond and diamond
- N° 4 pilots chuck in high alloy steel, foam, hardened, tempered, tempered, with surface hardness of 60 HRc
- Ø mm 9-10-11-12
- N° 8 grinding wheels with hub
- Ø mm 52,56,63,70,80,90