ZG-31 Electric Rail Drilling Machine – 0.75kW, 31kg Portable, ±0.5mm Accuracy

Product Overview

The ZG-31 is a portable electric rail drilling machine designed for railway maintenance teams and contractors working in tunnels, urban areas, depots, and workshops. It operates without engine noise or exhaust emissions, making it suitable for environments with strict air quality and noise regulations.

Powered by a 0.75 kW electric motor, the ZG-31 drills holes from Φ9.8 mm to Φ36 mm in under 30 seconds with a diameter tolerance of ±0.5 mm. Its 31 kg lightweight design and quick-clamp system enable one-person setup in under 2 minutes, supporting both scheduled maintenance and emergency rail repairs.

ZG-31 electric rail drilling machine in use

Close-up of ZG-31 rail drill motor and chuck

ZG-31 Electric Rail Drill – Technical Specifications

Parameter	Specification
Motor Power	0.75 kW
Voltage Options	220V / 380V (Single or Three Phase)
Spindle Speed	200 RPM
Drill Diameter Range	Φ9.8 mm – Φ36 mm
Time per Hole	≤ 30 seconds
Hole Accuracy	±0.5 mm diameter, ±1 mm position
Machine Weight	31 kg (Portable Design)
Dimensions (L×W×H)	695 × 230 × 395 mm

Key Advantages

✅ Zero Emissions & Low Noise – Electric operation eliminates exhaust fumes and reduces noise levels, meeting safety requirements in tunnels and urban rail zones.
✅ Fast Drilling Performance – Drills a standard Φ31 mm hole in ≤30 seconds using hollow-core bits, significantly faster than manual or hydraulic alternatives.
✅ High Positioning Accuracy – ±0.5 mm hole diameter tolerance ensures reliable bolt fit for splice plates and signal brackets, reducing long-term rail stress.
✅ Lightweight & Portable – Weighs only 31 kg with an integrated handle; can be carried and operated by one technician.
✅ Flexible Power Supply – Compatible with standard 220V single-phase or 380V three-phase power sources commonly available at rail depots and construction sites.

Operation Guide

Clamp Setup: Slide the fixture onto the rail and hand-tighten the front screw until the pressure pad makes full contact with the rail head.
Height Adjustment: Loosen the side bolts, rotate the vertical adjustment screw to align the drill bit perpendicular to the drilling point, then re-tighten.
Coolant Application: Fill the spray bottle with cutting fluid and apply during drilling to reduce bit wear and improve hole finish.
Power Connection: Use a grounded 3-pin plug. Do not force the drill-apply steady downward pressure and allow the motor to complete the cut.
Drilling & Cleanup: Start the motor, feed gently until breakthrough, then retract the bit. Remove metal swarf immediately to prevent corrosion.

> ⚠️ Safety Note: Always disconnect power before changing drill bits or performing maintenance. Do not operate in wet conditions or explosive atmospheres.

Maintenance & Safety

✅ Before Use: Check the power cord, switch, and plug for damage. Replace if insulation is cracked or frayed.
✅ Carbon Brushes: Inspect regularly; replace when worn below 5 mm (typically after 500 operating hours).
✅ Drill Bits: Resharpen or replace when drilling time increases or excessive sparking occurs.
✅ Storage: Clean the machine after use and store in a dry, ventilated area away from corrosive chemicals.
✅ Power Cord Handling: Never pull the machine by the cord. Keep it away from oil, heat sources, and sharp edges.

Typical Applications

🔧 Routine Track Maintenance – Drilling holes for splice plates, insulated rail joints, and signal brackets during scheduled work windows.
🚨 Emergency Rail Repairs – Rapid deployment for broken rail replacement or post-derailment track restoration.
🏗️ New Rail Construction – Batch drilling for pre-assembly of rail segments in large-scale track-laying projects.
🏭 Workshop Fabrication – Pre-drilling rail sections off-site to accelerate on-track installation.

Frequently Asked Questions

Q: Can the ZG-31 be used on curved rails?: A: Yes. The clamp system accommodates standard rail profiles with a minimum curve radius of 50 meters.
Q: What is the warranty period?: A: 12 months for the motor and gearbox. Consumables such as drill bits and carbon brushes are not covered.
Q: Is operator training available?: A: Yes. We provide video tutorials and optional on-site training (fees apply).
Q: Can I order a 110V version?: A: Custom voltage configurations are available upon request during quotation.
Q: How is the machine shipped?: A: Shipped in a wooden crate via sea or air freight with tracking. Delivery time is 7–25 days depending on destination.