CNC Lathe Chuck Back Plate

Name: CNC Chuck Back Plate to Support Lathe Chuck Holding - Frigate
Price: 249.00 USD
Availability: InStock

CNC Lathe Chuck Back Plate is precision-ground to maintain tight total indicator runout (TIR), typically within ±0.005 mm, ensuring alignment between the spindle and chuck centerline. This alignment is critical for maintaining concentricity in tight-tolerance turning operations, particularly in the production of rotationally symmetric components with minimal geometrical deviation.

Material

Ductile Iron (GGG40), Steel 4140 (hardened/tempered), Aluminum 7075-T6 (for high-speed applications)

Dimensional Tolerances

Spindle Fit – H7/h6 (ISO 286); Chuck Mounting – ±0.01 mm; Overall Thickness – ±0.05 mm

Spindle Mounting

Bore Diameter – Match spindle nose (A2-6, A2-8, etc.); Taper Fit – ≤0.005 mm TIR; Thread – Precision-ground (e.g., 8TPI, Whitworth)

Chuck Mounting

Bolt Circle – ±0.02 mm position; Hole Size – +0.01/-0 mm (reamed); Threads – ISO 898-1 Class 8.8 or higher

Flatness/Parallelism

Mounting Face – ≤0.01 mm/100 mm; Chuck Side – ≤0.015 mm

Product Description

CNC Lathe Chuck Back Plate is manufactured with strict control over mass distribution and moment of inertia to meet G2.5 dynamic balancing standards. This balance is essential for high-RPM spindle systems, where unbalanced rotating assemblies can induce harmonic vibration, reduce tool stability, and impact both dimensional accuracy and surface integrity.

Concentricity/Runout

Spindle-to-Chuck Mount – ≤0.005 mm TIR (dynamic balanced)

Surface Finish

Spindle/Chuck Faces – Ra ≤0.8 µm (ground); Non-Contact – Ra ≤1.6 µm

Burr-Free Requirement

Fully Deburred (ISO 13715 compliant); Edge Radius – 0.2–0.5 mm

Balance Grade

G2.5 at max RPM, G1.0

Certification Standards

ISO 1940-1 (Balance), DIN 55027 (Spindle Noses), ASME B5.50 (Chucks)

Technical Advantages

CNC Lathe Chuck Back Plate interfaces are machined to fit standard spindle configurations such as A-type, D-type, L00, and Camlock, with high-precision H7/g6 class fits. Such dimensional control ensures full face and taper engagement, providing uniform torque transfer and eliminating axial or radial shift during interrupted or heavy-depth cuts.

CNC Lathe Chuck Back Plate is manufactured from normalized, fine-grain alloy steel with controlled thermal treatment to reduce internal stresses. Its dimensional stability under thermal cycling and load variation supports consistent performance in long-duration machining, mitigating spindle distortion and preventing displacement of the chuck-body interface.

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Industry Applications

Aerospace Shaft Machining

Supports concentric clamping for long aerospace shafts, ensuring axial alignment under thermal expansion and dynamic radial cutting loads.

Automotive Crankshaft Turning

Maintains rotational symmetry during crankshaft machining, minimizing runout and vibration in multi-axis CNC lathe configurations.

Heavy Equipment Component Production

Transfers high torque loads during rough turning of forged components like axle housings and hydraulic cylinder bodies.

Powertrain Gear Blank Processing

Enables rigid mounting for gear blanks requiring precision turning of pitch diameters and controlled face runout.

Oilfield Coupling Manufacturing

Provides stable clamping interface for threading and boring operations on long oilfield couplings and casing connectors.

Precision Bearing Housing Machining

Maintains sub-micron runout for turning of bearing bores, ensuring geometric accuracy in spindle housing components.

Interface Durability and Contact Surface Conditioning

CNC Lathe Chuck Back Plate is treated with surface engineering processes such as black oxide or manganese phosphate to enhance resistance to fretting wear and corrosion at the mounting interface. Hardening of contact zones extends interface longevity under repeated clamping cycles, preventing localized galling and surface degradation under load.

CNC Lathe Chuck Back Plate is configured with standardized bolt-hole arrays and precision pilots to support modular chuck mounting. This modularity reduces setup time during chuck replacement or process shifts, enabling consistent Z-axis referencing without repeated spindle alignment or manual calibration during part changeovers.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate ensure repeatable axial positioning for frequent chuck changes?

Frigate machines CNC Lathe Chuck Back Plates with tight-tolerance pilot diameters and precision-located bolt circles. This ensures the chuck re-seats identically each time without the need for re-indicating. The face and pilot surfaces are ground to achieve sub-10-micron flatness and perpendicularity. This repeatability reduces setup time and maintains machining accuracy during chuck swaps.

What makes Frigate's back plates suitable for interrupted cutting operations?

Frigate uses stress-relieved alloy steel with high yield strength to absorb torsional and impact loads from interrupted cuts. The CNC Lathe Chuck Back Plate is designed to distribute cutting forces evenly through the full contact area with the spindle. Fit tolerances are optimized to eliminate micro-slip at the interface. This design prevents interface fatigue and preserves spindle accuracy over time.

How does Frigate handle custom mounting pattern requirements for non-standard chucks?

Frigate provides CNC Lathe Chuck Back Plates with custom PCD bolt patterns and offset pilots based on customer-supplied chuck drawings. All custom features are machined with CMM-verified accuracy and full geometric tolerance documentation. This allows users to integrate special chucks without modifying the spindle nose. The result is a precise mechanical fit with no compromise in rigidity or alignment.

How does Frigate control parallelism between the back plate face and the spindle axis?

Frigate uses dual-surface grinding techniques to maintain strict parallelism between the mounting face and the spindle mating plane. This is critical to avoid tilt-induced angular runout during high-precision turning. CNC Lathe Chuck Back Plates are checked on certified granite inspection fixtures using dial indicators and air gauges. Each part is documented with traceable measurement reports before shipment.

How does Frigate prevent fretting corrosion in high-cycle production environments?

Frigate applies surface treatments such as black oxide or manganese phosphate to the spindle contact surfaces of CNC Lathe Chuck Back Plates. These coatings reduce metal-to-metal friction and inhibit oxidation under repeated tightening cycles. In addition, controlled surface roughness (Ra < 1.6 µm) reduces localized stress concentrations. This combination extends service life under high cycle fatigue and dynamic loading.

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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

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