NCM-4.0 Internal Combustion Switch Rail Grinder Railway Turnout Rail Profile Grinding Machine

Category： Track Maintenance Equipment
Model: NCM-4.0
Engine Power: 6.5 HP (4.8 kW)
Fuel Consumption: Approx. 1.4 L/h
Grinding Wheel Size: φ254 × φ30 × 35 mm
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NCM-4.0 Internal Combustion Switch Rail Grinder Railway Turnout Rail Profile Grinding Machine

1. Overview

NCM-4.0 internal combustion switch rail grinder (commonly known as turnout grinder) is mainly used for grinding the top and side fat edges of switch rails, frog center rails and wing rails in turnout switch assemblies. It can also grind the top and side fat edges of various types of standard rails. Featuring superior performance, reasonable structure and reliable quality, it greatly improves efficiency and reduces labor intensity, making it an essential machine for track maintenance in railway public works departments.

2. Key Applications

• Grinding of railway turnouts (switch rails, frog rails, wing rails)

• Removal of fat edges on various steel rail surfaces and sides

• Routine track maintenance and rail profile finishing

3. Technical Specifications

Item	Details
Model	NCM-4.0
Abbreviation	Turnout Grinder
Engine Type	4-stroke gasoline engine
Engine Model	GX160
Engine Power	6.5 HP (4.8 kW)
Engine Speed	3600 rpm
Fuel Tank Capacity	1.8 L
Fuel Consumption	Approx. 1.4 L/h
Fuel Requirement	92# pure gasoline
Grinding Head Inclination	±40° adjustable
Grinding Wheel Size	φ254 × φ30 × 35 mm
Net Weight	100 kg
Overall Dimensions	1680 × 900 × 900 mm

4. Main Structure

Component	Description
Main Composition	Travel wheels, grinding carriage, gasoline engine, grinding head, grinding head swing device, lifting device, front-rear feeding device
Travel Frame	Rectangular telescopic frame, adjustable according to on-site gauge; equipped with 4 insulated iron travel wheels
Grinding Carriage	Main body of the machine; powered by 4.8 kW gasoline engine; driven by belt and gear transmission for swing, lifting and feeding movement

4. Working Principle

The grinder is placed on the track at the position to be ground and can run along the rail. The grinding carriage moves transversely on the travel frame to position at any point of the turnout. The height of the grinding head is adjusted via a lead screw handle to align with the target area. The machine is manually pushed along the rail to perform continuous grinding operation.

5. Operation Instructions

Stage	Steps
Pre-operation Preparation	1. Check fuel and engine oil levels; do not overfill fuel to avoid spillage during inclined operation. 2. Inspect belt wear, fastener tightness and spindle radial clearance. 3. Verify grinding wheel model, check for cracks and firm installation; ensure grinding wheel guard is intact. 4. Check transverse and longitudinal travel wheels for damage.
Machine Operation	1. Set the main machine to a horizontal position. 2. Open fuel valve, close choke, set throttle to low speed; pull recoil starter to start engine; set stop switch to ON; after startup, return choke to original position and idle warm-up before increasing speed for grinding. 3. Wear required safety protective equipment during operation. 4. Adjust the grinding feed amount slowly to avoid the grinding wheel hitting the rail; stop the machine immediately if there is abnormal noise, and resume operation only after troubleshooting.
Shutdown	1. First reset the grinding wheel, adjust the engine to a horizontal position, then push the throttle handle to low speed, set the stop switch to OFF position, and close the fuel valve. 2. If refueling is needed midway, stop the machine first and take fire prevention measures.