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Berco ACZ-71

Industrial cylinder boring and surface milling machine
Production period: 1970s–1980s, heavy-duty industrial design
The Berco ACZ-71 is a high-precision cylinder boring and surface milling machine designed primarily for the reconditioning and oversize boring of internal combustion engine cylinders. The machine belongs to Berco’s classic industrial series of engine reconditioning equipment, featuring a robust cast-iron chassis and a high-rigidity spindle assembly.
The equipment is suitable for the precision boring of engine blocks, cylinder liners, and industrial cylinders. The stable T-slotted worktable and the long stroke capacity enable the machining of large-scale engine blocks. The machine features a multi-speed mechanical spindle drive and a precision feed system, ensuring consistent and uniform bore quality.

Key Technical Specifications:

• Minimum boring diameter: approx. 31 mm
• Maximum boring diameter: approx. 180 mm
• Spindle speed range: approx. 155–873 rpm (multi-stage)
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• Feed rates: approx. 0.04 – 0.076 – 0.128 mm/rev
• Main motor power: approx. 1 HP
• Longitudinal table travel: approx. 1000 mm
• Cross table travel: approx. 100 mm
• Effective table dimensions: approx. 1100 × 400 mm
• Vertical head travel: approx. 700 mm
• Maximum boring depth: approx. 480 mm
• Maximum working height on table: approx. 820 mm
• Distance from spindle centerline to column: approx. 305 mm
• Machine weight: approx. 1500 kg
• Heavy-duty cast-iron chassis and precision guideways