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Valve Cut Off Machine Valve Cut Off Machine

Engine valve cut off machine is used for cutting off the stem of engine valve and to control the total length. Using CBN Wheel to cut. High precision with high efficiency

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Product Description

Engine valve cut off machine is special purpose machine for engine valves. Using CBN high speed wheel to cut the stem of engine valve in order to control the total length of engine valve. Ranging from Stem diameter: 5-8 mm, Head diameter: 20-50 mm, overall length: 80-150 mm. Valve cut off machine can be single production and also can be connection production. As a professional cut off machine suppliers in China, Our equipment is continually upgraded with latest technologies in processing engine valve.

Main Features


Mechanical spindle

6000rpm high-speed spindle adopts Germany FAG precision bearing. High accuracy and easy to maintenance and replacement;

One year warranty.

control system

Control system

Adapts Mitsubishi PLC control system, Mitsubishi motion system and Mitsubishi touch screen;

All parameters can be set and display on the touch screen;

Can store more sets program, you can choose according to different process technology.

Head face positioning

Grinding wheel

Engine vavle cut off grinding machine's grinding wheel is bronze and CBN sintered grinding wheel;

Long life span from Japan.

loading system

Loading & unloading system

The rails can meet different size valves and easy to adjust;

The rest actions should carry out with grinding except for loading & unloading system;

Loading & unloading system has proper protection measures and doesn't affect the operator to change the fixture, wheel, and other toolings.

If the loading & unloading system is out of control, the machine will ring and stop the cycle.

Positioning way

Feeding way and positioning way

Feeding way: Precision sliding table composed of linear guide. Moving according to air cylinder.

Positioning way: Head face of engine valve positioning.

Technical Parameter

Before Processing 
Processing rangeHead diameter: 20-50 mm, stem diameter: 5-8 mm, overall length: 80-150 mm 
Raw Material21-4N, 4Cr10Si2Mo, WNB, Imported: SUH:3, SUH:35; Hardness: 25-45 HRC

Grinding allowance 0.5-5 mm ( it is up to grinding wheel )
After Processing 
Processing accuracy Length accuracy Within ±0.03 mm, Sampling and using special inspection tool to meausre 50 pieces, CPK≥1.33
Square stem end- stem Within 0.03 mm, Sampling and using special inspection tool to measure 50 pieces, CPK≥1.33
Surface treatment Within Ra 2.5, CPK≥1.33
Cycle time 6s/piece ( according to the valve size ) 
Wheel size 
CBN Wheel 380*160*1.8 mm
Wheel speed m/s 80-140


cut off

Valve Cut off Machine is the special-purpose machine for engine valves. 

It is used for cutting off the stem of engine valve and to control the total length.

It is used to process engine valves (inlet valves and exhaust valves) in cars, motorcycles, trucks, and other engine valves.



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