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Pin Grinding Machine for Crankshaft

-- Steady & Reliable Manufacturer --

Intro

This pin grinding machine is specified around the tolerances that matter on a crankpin: throw (stroke) accuracy, phase angle between pins, pin-to-main-journal parallelism, and the shoulder faces and fillets either side of the pin. Roundness alone is rarely the problem buyers are trying to solve.

Core Capability

A CNC C-axis indexes each pin to its programmed phase angle, while an angular wheelhead option grinds the pin diameter and its shoulder face in one plunge. That keeps pin width and shoulder position consistent across a batch without a second pass or a separate face-grinding step.

Premium Materials and Components

Materials and components are the most critical elements to affect the performance of the equipment.

We use high-quality raw materials and branded components to ensure that our high-performance machines have a long service life and short downtime.

  • External grinding wheel chuck
  • Flat grinding wheel chuck
  • Φ 400 or Φ 600 balance frame
  • M7130-5006 front bearing
  • Rapid advance and retreat cylinder
  • Pressure valve plate assembly
  • Feed box assembly
  • Overflow valve
  • Table control box
  • Grinding head box
  • Control panel assembly
Design for High Performance

The performance of a machine is the result of the combined effect of all its components.

Our technical team consists of experienced engineers and technicians who are not only proficient in the operation and maintenance of grinders, but also have a deep understanding of material properties and processing technology. This enables us to provide customers with customized solutions to meet their specific processing needs.

By deeply studying the design and manufacturing process of precision grinding machines and paying great attention to configuration and construction from the beginning, our R&D team is able to provide high-performance equipment.

Specification

ItemValue
ModelMQ8260-P (pin grinding series)
Crankpin diameter rangeØ30–120mm
Crankpin width range20–90mm
Throw radius range10–120mm
Throw (stroke) accuracy±0.01mm
Pin phase angle accuracy±0.05°
Pin parallelism to main axis≤0.005mm per 100mm
Pin roundness≤0.003mm
Wheelhead optionsStraight, or angular (approx. 30°) for pin plus shoulder face
Grinding wheel sizeØ600–750mm
CNC systemSiemens 828D / Fanuc 0i-F
Machine weightapprox. 10 tons

Send the pin dimensions, throw, phase angles and shoulder/fillet requirements from your crankshaft drawing so we can confirm the wheelhead option and fixturing.

Pin Features Covered

Pin diameter, pin width, both shoulder faces and the fillet or undercut radius are all ground from the same program. Typical work is automotive, motorcycle, compressor and small marine crankshafts in forged steel or ductile iron.

What Drives Pin Accuracy

Throw accuracy depends on the work-head's eccentric positioning and thermal stability, while phase angle depends on C-axis resolution and how the crankshaft is located at the start of the cycle. Both are checked on a full crankshaft before shipment, not on a single pin in isolation.

Core Functions

  • CNC C-axis indexing to programmed phase angles for each pin
  • Orbital pin grinding with programmable throw radius
  • Angular wheelhead option for pin diameter plus shoulder face in one plunge
  • Profiled wheel dressing for fillet and undercut radii
  • In-process gauge for pin diameter with automatic wheel wear compensation
  • Dynamic balance correction for the eccentric mass at grinding speed

Quality Control

  • Throw, phase angle and pin parallelism verified on a full sample crankshaft
  • Shoulder face position and fillet radius checked against the drawing
  • Roundness and surface finish measured on every pin of the test shaft
  • Gauge calibration cross-checked against CMM measurement
  • ISO9001-certified manufacturing with documented warranty terms

FAQ

  • Q: What phase angle accuracy can be held between pins?
  • A: Typically ±0.05° with the CNC C-axis, verified on a complete sample crankshaft rather than calculated from component specifications.
  • Q: Can the pin and its shoulder faces be ground in one operation?
  • A: Yes, with the angular wheelhead option the pin diameter and one shoulder face are ground in a single plunge, which keeps pin width consistent from part to part.
  • Q: Does it grind fillet radii as well?
  • A: Yes, a profiled wheel dressed by the rotary diamond dresser grinds the fillet or undercut radius; share the radius and relief requirements from your drawing to confirm.
  • Q: How is this different from your crank grinder machine page?
  • A: The same machine family covers both, but this page is for buyers specifying pin-level tolerances such as throw, phase angle and shoulder position, which usually decide whether a machine is suitable.
  • Q: What is the typical lead time?
  • A: Standard configurations usually ship in 75–95 days; an angular wheelhead or added gauge points may extend this to 95–120 days.

Equipment Configuration

  • High-resolution C-axis drive with direct encoder feedback
  • Orbital work-head with servo-controlled eccentric positioning
  • Hydrodynamic or hydrostatic wheel-spindle bearings
  • Rotary diamond dresser capable of fillet profile dressing
  • Hydraulic steady rests with positions set per crankshaft length

Where It Is Used

  • Automotive and motorcycle crankshaft manufacturers
  • Compressor and generator crankshaft producers
  • Crankshaft remanufacturers regrinding worn or damaged pins
  • Small marine and agricultural engine crankshaft suppliers

Automation Options

  • Custom throw-radius range and pin-width capacity for non-standard crankshafts
  • Angular wheelhead configuration matched to your shoulder geometry
  • Pin-by-pin gauge points for throw and phase angle verification
  • Program development from your crankshaft drawing before delivery
  • Robot loading integration for repeat production batches
  • 35000 m²+
    Total Factory Area
  • 2003
    Was Founded In
  • 210+
    Precision Equipment
  • 45+
    Exporting Countries & Regions
Zhejiang Quanshun Machine Tool Co., Ltd.

Zhejiang Quanshun Machine Tool Co., Ltd.

Zhejiang Quanshun Machine Tool Co., Ltd. is a professional manufacturer of precision grinding machines. It is located in Zhuji, Zhejiang Province, the main economic development area of the Yangtze River Delta. It is 65km away from Hangzhou, 180km away from Shanghai, 60km away from Hangzhou International Airport, and 60km away from expressways such as Hangjinqu, Zhuyong, and Shaozhu, with convenient transportation and unique geographical location.

The company covers an area of 35000 square meters and a building area of 32000 square meters. Zhejiang Quanshun Machine Tool Co., Ltd. is a professional wholesale Pin Grinding Machine for Crankshaft Manufacturers and Pin Grinding Machine for Crankshaft Factory. It has a machine tool production base and a hydraulic parts production base. The main products are various specifications of ordinary (CNC) cylindrical grinding machines, CNC end face cylindrical grinding machines, automatic loading and unloading CNC (end face) cylindrical grinding machines, composite grinding machines，high-precision ordinary (CNC) cylindrical grinding machines, and we can design and develop various kinds of non-standard special grinding machines according to the needs of users and provide relevant technology, software, training services and automation solutions. Our company has complete product research and development capabilities, passed IS09001-2015 quality system and CE safety certifications, and was named "National High-tech Enterprise".In 2021, it was rated as a specialized and new small and medium-sized enterprise in Zhejiang Province. We also have self-export qualifications. Our company adheres to the concept of "quality first, reputation first, service first", so that our products have a good reputation in the market. At present, our products have been exported to more than 20 countries, such as the United States, Germany, Japan, and Southeast Asia.

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Certificate

Believe In Our Strength

Zhejiang Quanshun Machine Tool Co., Ltd. has more than 20 years of industry experience, we specialize in the manufacture of high-quality precision grinding machines.
  • Advanced manufacturing procedures.
  • Full quality management system.
  • Thoughtful after-sales service.

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