Long Bar Grinding Automation

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High-Precision Long Bar Centerless Grinding Automation

Model: 18S + Long Bar Grinding Automation System

The 18S Centerless Grinding Machine with Long Bar Grinding Automation is engineered for continuous, high-precision production of long shafts, rods, and bars. This automated centerless grinding solution is ideal for automotive, aerospace, tooling, hydraulic, and precision machinery applications that require tight tolerance control and stable mass production of long workpieces.

Workpiece Capacity

Bar diameter range: Ø10 mm – Ø30 mm
Bar length: Up to 3,000 mm (3 meters)
Grinding mode: Continuous / automatic centerless grinding for long bars

These specifications make the system suitable for long bar grinding, guide rods, piston rods, motor shafts, transmission shafts, and precision tooling blanks.

Precision & Process Capability

1. Size Precision (Overall Tolerance Control)

Achieves < 0.01 mm total size variation along the full bar length during standard automatic grinding.
Full-length grinding accuracy is maintained even when both ends of the bar are included in the measurement.

Keyword focus: high-precision centerless grinding, long bar grinding accuracy, precision shaft grinding

2. Dimensional Control After Auto Dressing & Compensation

After automatic wheel dressing and in-cycle compensation, the machine can hold < 0.002 mm size repeatability.
This is ideal for stable mass production with strict diameter consistency.

Why this matters: Automatic dressing and automatic compensation reduce human error and keep the grinding wheel in optimal cutting condition for consistent tolerance, even in long production runs.

Keyword focus: automatic compensation, auto dressing, precision diameter control, production grinding stability

3. Selective Measurement Zone (Excluding Ends)

When the head and tail (first 50 mm and last 50 mm) are excluded from inspection, the machine can maintain diameter accuracy within 0.002 mm on the effective working area.
This meets typical OEM shaft requirements where clamping or cutting allowances exist at both ends.

Keyword focus: long shaft grinding, precision rod grinding, centerless grinding for hydraulic shafts

4. Straightness Control

Under optimized setup and process control, the system can achieve ≤ 0.1 mm per meter straightness.
Stable support and controlled feeding reduce bar deflection during grinding of long parts.

Keyword focus: straightness control for long bars, precision guide rod grinding, long bar support system

5. Cylindricity / Roundness

Cylindricity can be controlled below 0.005 mm under controlled grinding conditions.
This is critical for applications such as hydraulic cylinder rods, high-speed shafts, and bearing-fit surfaces.

Keyword focus: cylindricity control, roundness tolerance, high-precision centerless grinding machine

Production Performance

6. Positioning Reservation

Positioning reservation is controlled at 0.15 mm per job, ensuring stable stock removal and predictable finish size.

This allows consistent setup and repeatable grinding in automated production cells.

7. Cycle Time / Throughput

Typical operating speed is about 120 seconds per piece (per bar).
The automation minimizes manual handling, improves takt time, and reduces operator fatigue for long-bar grinding.

Keyword focus: centerless grinding automation cycle time, automated shaft grinding productivity

Key Advantages of the 18S + Long Bar Grinding Automation

1. Full-Length Precision Grinding for Long Bars
Designed specifically for long workpieces up to 3 meters, this centerless grinding system delivers consistent diameter control across the entire shaft.

2. Stable Mass Production
Automatic dressing, in-process compensation, and controlled feeding make it suitable for unattended or low-operator-load production.

3. Consistent Micron-Level Tolerance
Dimensional stability within 0.002 mm (after auto dressing & compensation) supports high-end applications such as hydraulic components, motion systems, precision mechanical shafts, and linear motion elements.

4. Improved Surface Integrity
Centerless grinding provides superior surface finish and roundness, reducing secondary machining and polishing.

5. Reduced Rejection Rate
High straightness (≤0.1 mm/m) and cylindricity (<0.005 mm) improve assembly fit, bearing life, sealing performance, and dynamic balance.

Typical Applications

Hydraulic cylinder rods / piston rods
Automotive transmission shafts
Linear motion guide bars
Motor shafts and spindle blanks
Long tool blanks and alloy rods
Precision steel bars for machining centers and automation equipment

Keyword focus: hydraulic rod grinding, shaft grinding automation, precision bar grinding equipment

Why Choose Automated Long Bar Centerless Grinding?

Traditional grinding of long shafts often struggles with bending, vibration, and inconsistent size over long lengths. The 18S Long Bar Grinding Automation solves these problems with:

Rigid support during grinding of 1–3 meter bars
Controlled infeed and stable bar guidance
Intelligent size compensation after wheel wear
Repeatable tolerance without manual adjustment

This results in lower cost per part, higher throughput, and more reliable quality for high-precision bar production.

Summary of Technical Highlights (Quick Spec)

Diameter Range: Ø10–Ø30 mm
Max Length: 3,000 mm
Full-Length Size Precision: <0.01 mm
After Auto Dressing & Compensation: <0.002 mm
Excluding 50 mm from both ends: ≤0.002 mm on working length
Straightness: ≤0.1 mm / meter
Cylindricity: <0.005 mm
Positioning Reservation: 0.15 mm / job
Production Speed: ~120 sec / piece

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