Nippei Heavy-Duty Gap Grinder (Strut Grinder) – Aerospace-Grade Precision
The machine has is currently dismantled for transport, we will mock assemble in our facility
This Nippei Gap Grinder, also known as a Strut Grinder, is a large-capacity precision grinding machine specifically designed for machining long, heavy cylindrical components such as aircraft landing gear struts and other aerospace-grade parts.
Built mainly for the aerospace industry and other heavy industrial applications, the Nippei Gap Grinder features a wide open-frame (or "gap") design that allows for easy loading and precise grinding of oversized workpieces that exceed the capacity of traditional cylindrical grinders.
Key Features:
Heavy-duty open-frame structure accommodates long or bulky parts such as landing gear struts, actuator bodies, and aerospace shafts
Precision grinding spindle for tight tolerances and high-quality surface finishes
Robust machine bed and part supports to ensure stability and reduce vibration during heavy grinding operations
Integrated coolant and filtration system to maintain temperature control and prolong grinding wheel life
Custom fixturing available for handling complex geometries and high part weights
Typical Applications:
Aircraft landing gear struts
Hydraulic cylinders and actuators
Long or heavy-duty industrial shafts
Components requiring high accuracy and fine surface finish
As a trusted name in precision grinding, Nippei has engineered this machine to deliver the performance, durability, and accuracy required in demanding aerospace environments. It's an ideal solution for OEMs, MRO facilities, and precision machining shops working with high-value components.
NIPPEI Universal Grinder 1984
Gap-Grinder
Swivel wheel-head 180 degrees
B/C up to 3metres x 0.0330mm.
Swing over table 840 mm
Swing over Gap 2700mm
I.D grinding range 30mm to 250mm x 1250 depth.
Machine Specifications
Grinding Capacity
Internal Grinding Range:
Ø30 mm to Ø250 mm x 1250 mm deep, up to 3000 mm max
Length Between Centers: 2000 mm - 3000 mm
Max. Work Size: Ø330 mm x 2000 mm length
Distance Between Chuck & Centre: 200 mm to 1000 mm
In-Gap Capacity: Up to 2700 mm
Swing Capacities
Swing Over Table: 840 mm max
Swing in Gap: 2700 mm max
Workpiece Handling
Max. Mass Held Unsupported in Chuck:
400 kg (including chuck)
Wheel Head
Wheel Size:
Ø610 mm (outer diameter) x 75 mm (width) x Ø304.8 mm (inner diameter)
Spindle Speeds:500, 630, 780 rpm
Wheel Head Travel:270 mm
Wheel Head Swivel:±180°
Carriage
Carriage Traverse:2300 mm
Traverse Speed:50 to 2000 mm/min
Traverse Rate per Revolution of Handwheel:10 mm
Traverse Rate per Revolution of Traverse Stopper Adjust Handwheel:0.3 mm
Headstock
Distance Between Chuck and Centre (in Gap): 1000 mm
Cross Travel: 300 mm
Headstock Swivel: ±10°
Spindle Speed Range: 8 to 180 RPM
Spindle Taper: No. 5 Morse
Face Plate Outer Diameter: Ø1300 mm
Tailstock
Spindle Taper: No. 5 Morse
Wheel Feed
Automatic Diameter Feed at Table Reversal:
0.002 mm to 0.01 mm on work diameter
Fine Feed Adjustment: 0.002 mm on work diameter
Motors Wheel Head Motor:7.5 kW, 4P
Internal Grinding Motor:3.7 kW, 2P
Headstock Motor:3.7 kW DC
Hydraulic Pump Motor:3.7 kW, 4P
Main Coolant Pump:0.75 kW, 2P
Sub-Tank Coolant Pump:0.75 kW, 2P
Machine Dimensions
Height to Centre (from Floor): 1740 mm
Machine Weight: Approx. 24 tons
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