Surface grinding machine ETLS-250600NC

for large workpiecescolumn typewith magnetic clamping

Structure
High-strength cast iron (HT300) with tempering treatment forms the machine bed and double-column door frame to ensure rigidity, stability and long-term geometric stability. The fixed cross-beam integrates beam and columns into a single rigid assembly to minimise deformation under load.

Movements
Twin large V-ways on the base and worktable provide stable table travel and optimal alignment. Vertical and longitudinal movements of the grinding heads are driven by high-precision ball screws and Baldor AC servo motors (PNC type) for accurate positioning and micron-level feed control. Cross travel uses high-density S55C steel rails with ultra-precision linear roller bearings for smooth, rigid motion. Vertical head swivel is driven via AC servo on a worm shaft with numerical angle input to 0.1° accuracy for precision angular grinding.

Spindle & Motor set
Cartridge-type spindles assembled in-house use six super-precision CP4 angular contact bearings with permanent lubrication for low noise, low thermal growth and sustained accuracy. High-torque V3-grade spindle motors (Japanese brand) are dynamically balanced and coupled directly to the spindle for maximum torque transmission and reduced vibration.

Lubrication
Force-feed lubrication delivers oil from upper to lower railways to avoid pulsation effects and ensure consistent lubrication. A sensor monitors oil pressure and disables table motion if lubrication pressure is abnormal to protect the rails.

Hydraulic system
Precision electrical control governs a proportional hydraulic valve. Table speed can be adjusted from the operator panel to optimise cycle time. Hydraulic oil temperature is stabilised by a Habor coolant system to maintain hydraulic performance and protect components during long runtime.

Control System (PNC type)
DSC-based NC integrates machine functions on a single control panel. AC servo motors control vertical and cross feeds. LCD panel with digital inputs allows straightforward operation across grinding tasks; the system is designed for ease of use without complex programming.

Technical table

• Main item: Twin heads double column type surface and slideway grinder (Models: 200400/250600 ; 200800/250800)
• Electromagnet table size (x*y) (mm): 4000/6000 x 2000/2500 ; 8000 x 2000/2500
• Left and right X-axis travel (mm): 4200/6200 ; 8200
• Max center of wheel to table (mm): 650
• Two column passed maximum workpiece size (mm): 2560/3060
• Worktable maximum loading capacity (kg): 8000/9000 ; 10000
• Worktable feed speed (m/min): 5-30
• Table T-slot specification (mm*n): 18 x 8 / 18 x 10
• Surface grinding wheel max (mm): OD500 x 203 x 50-75
• Surface spindle motor (HP*P): 25 x 4
• Surface grinding wheel speed (RPM, 50Hz): 1450
• Slideway grinding wheel max (mm): 350 x 127 x 40
• Slideway rotation angle: Left 90°, Right 90°
• Slideway spindle motor (HP*P): 7.5 x 4
• Option: Positive and negative rotation (RPM): 0-1500
• Machine height (mm): ≈3500 / 3900
• Floor space (mm): 12000 / 15000 x 5000 ; 18100 x 5000
• Weight (kg): ≈42000 / 70000 ; ≈73000 / 83000