Main Grinding Spindle for Optical Lens Grinding Machines

Product Specifications

Technical details and manufacturing context for Main Grinding Spindle

Definition

The main grinding spindle is the core rotating component in a precision optical lens grinding machine. It transmits power from the motor to the grinding wheel, providing the precise rotational motion required for grinding optical lenses to exact specifications. The spindle is designed to minimize vibration and maintain maximum stability during the grinding process, which is critical for achieving the required surface finish and dimensional accuracy on optical lenses.

Constructed from high-grade alloy steel and equipped with ceramic bearings, the spindle is built for durability and precision. It operates at speeds typically ranging from 3,000 to 10,000 rpm, with power ratings between 1.5 and 5.5 kW. The spindle taper conforms to ISO 7388 (ISO 40), ensuring standardized tool holding. Runout (TIR) is maintained at ≤0.002 mm per ISO 230-1, and axial stiffness is ≥200 N/µm to resist deflection under load. The spindle uses oil-air cooling for thermal stability and grease lubrication for low maintenance. It operates within a temperature range of 5–40 °C, has an ingress protection rating of IP54 per IEC 60529, and weighs between 80 and 150 kg.

These parameters serve as reference ranges for selection and verification. Actual values must be confirmed with the legal manufacturer or supplier for the specific model and application. The spindle is a component intended for integration into optical lens grinding machines; it is not a standalone product. Buyers should verify compatibility with their machine's motor, drive system, and tooling. Standards listed are procurement references, not proof of certification or compliance.

Working Principle

The spindle rotates at high speeds, typically thousands of rpm, driven by an electric motor through a belt or direct drive system. It holds the grinding wheel securely and maintains precise concentricity and minimal runout to achieve the required surface finish and dimensional accuracy on optical lenses. The high-grade alloy steel construction and ceramic bearings reduce vibration and thermal growth, while oil-air cooling and grease lubrication ensure stable operation. The spindle's stiffness and low runout are critical for precision grinding, as any deflection or eccentricity would degrade lens quality.

Common Materials

High-grade alloy steel, Ceramic bearings

Technical Parameters

Parameter	Typical range	Notes & selection driver
Spindle Speed Range	3000–10000 rpm	Higher speeds improve surface finish but reduce tool life.
Spindle Power	1.5–5.5 kW	Select based on material removal rate and wheel size.
Spindle Taper	ISO 40	Standard taper for tool holding.ISO 7388
Runout (TIR)	≤0.002 mm	Critical for lens surface accuracy.ISO 230-1
Axial Stiffness	≥200 N/µm	Higher stiffness reduces deflection under load.
Cooling Method	Oil–air	Oil-air cooling maintains thermal stability.
Lubrication	Grease	Permanent grease lubrication for low maintenance.
Operating Temperature Range	5–40 °C	Outside this range, thermal growth affects precision.
Ingress Protection Rating	IP54	Protects against dust and water splashes.IEC 60529
Weight	80–150 kg	Affects machine dynamics and installation.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Spindle Shaft Part
Main rotating element that transmits torque

Material: High-grade alloy steel
Bearings Part
Support the shaft and minimize friction during rotation

Material: Ceramic or precision steel balls
Tool Holder
Securely holds the grinding wheel in place

Material: Steel or carbide
Oil-Air Cooling and Lubrication
Feeds oil mist to the bearings and carries the heat away, which is what holds runout stable at speed.

Manufacturers of Main Grinding Spindle

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Frequently Asked Questions

What is the main grinding spindle used for?

It is the core rotating component in a precision optical lens grinding machine, driving the grinding wheel to shape optical lenses with high accuracy.

What materials are used in the spindle?

The spindle is made of high-grade alloy steel and uses ceramic bearings, as listed in the directory.

What are the key specifications to verify?

Verify spindle speed range, power, taper, runout, stiffness, cooling method, lubrication, temperature range, IP rating, and weight with the manufacturer for your specific model.

Does the spindle come with certification?

The directory lists standards like ISO 7388 and ISO 230-1 as references, but certification must be confirmed with the legal manufacturer or supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Max 0.5 MPa (5 bar) at spindle bearings
other spec:	Flow Rate: 2-10 L/min coolant, Slurry Concentration: ≤15% abrasive by weight
temperature:	+5°C to +40°C

Main Grinding Spindle

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