High-Precision CNC Machine Turret Components

Compatibility / Customization: Built to OEM specs or custom engineering drawings (Sauter, Duplomatic, or proprietary interfaces).

Primary Materials: 42CrMo4 (EN 1.7225 / AISI 4140), 20NiCrMo2 (EN 1.6523 / AISI 8620), 17-4PH.

Product Overview

Precision-machined structural and indexing sub-components for CNC lathe turrets. Engineered to sustain dynamic shock loads during heavy roughing and maintain positioning repeatability over >=3,000,000 indexing cycles.

Core Scope: Turret discs (plates), Curvic/Hirth couplings (teeth ring pairs), index cams, worm shafts, and sealed housings.

Execution Basis: Customer CAD/STEP/PDF drawing + GD&T tolerance specs.

Typical Batch Size: 5 to 200 units (Prototype phase available).

Technical Specifications

Parameter	Standard Grade / Capability	Tight Tolerance / Precision Grade	Verification Method
Material Composition	42CrMo4 / 20NiCrMo2	Custom vacuum-melted alloy steel	Mill Test Certificate (3.1/2.2)
Tooth Flank Hardness	HRC 58-62 (depth 0.8-1.2 mm)	HRC 60-63 (nitrided/case-hardened)	Leeb/Rockwell hardness tester
Coupling Indexing Accuracy	+-3 arcsec	+-1.5 arcsec	Optical autocollimator / 3D CMM
Surface Flatness / Parallelism	0.01 mm / 300 mm	<=0.005 mm / 300 mm	Zeiss CMM / Laser interferometer
Interface Datum Runout	<=0.015 mm TIR	<=0.008 mm TIR	Rotary table + dial indicator / CMM
Surface Finish (Ra)	0.8 um (mounting faces)	0.2 um (ground coupling teeth)	Stylus profilometer

Key Features

Zero-Backlash Curvic Interface: Crowned tooth flank geometry ensures 3-dimensional self-centering and load distribution across >=60% tooth surface contact under axial clamping force.

Thermal Stress Relief: Sub-critical annealing and cryogenic stabilization (-80°C sub-zero treatment) executed prior to final finish-grinding to eliminate residual machining distortion.

Controlled Case Depth: Plasma nitriding or carburizing profile verified via micro-hardness cross-section analysis per batch.

Mounting Interchangeability: Dowel pin hole patterns and bolt circle (PCD) tolerance held within +-0.008 mm relative to center bore datum.

Applications

Turning Center Turret Retrofit: Replacement of worn indexing plates causing turret misalignment or index error alarms.

Multi-Axis Live Tooling Blocks: Structural interface bodies absorbing milling spindle torque (Nm ratings per customer specs).

Special-Purpose Rotary Indexers: Rotary transfer tables requiring high axial/radial rigidity under intermittent milling/drilling.

Customization (OEM/ODM Workflow)

Engineering Review (24-48h): DFM feedback on draft angles, undercut relief, and heat-treat distortion risks.

Material Traceability: Heat number stamping and EN 10204 3.1 material cert provided standard.

Interface Modification: Custom bolt patterns, coolant-through-turret ports, or sensor dog notches machined per redline revision.

IP Protection: NDA signed upon request prior to file upload.

Manufacturing & Internal Quality Control

Machining Cell: 5-axis DMG MORI / Mazak turning-milling centers + Reishauer/Jingda gear grinding for Curvic teeth profiling.

Heat Treat Control: In-house/controlled-partner vacuum furnaces with computerized carbon-potential atmosphere logging.

Inspection Gate:
• 100% dimensional check on critical interface bores and PCD.
• 100% magnetic particle testing (MT) on carburized Curvic coupling teeth to screen micro-cracks.
• Deliverable per lot: Full CMM report + Material Test Report (MTR 3.1) + Contact pattern photo record upon request.

Packaging & Delivery

Corrosion Protection: VCI anti-rust film wrap + silica gel desiccant inside sealed multi-layer HDPE bag.

Mechanical Protection: Custom high-density EPE foam cavity boxes or fumigation-free plywood crates (preventing tooth edge impact during transit).

Lead Time:
• Prototypes: 15-20 working days post-drawing freeze.
• Batch production: 25-35 working days.

Shipping Terms: FOB / CIF / DDP (Air Express for urgent breakdown spares, Sea/Rail for batch orders).

FAQ

Q: Can you machine Curvic couplings without a physical sample, strictly from a STEP/PDF file?

A: Yes, provided pressure angle, number of teeth, mean diameter, convex radius, and axial clamping force parameters are defined in the drawing notes. Otherwise, mating interface geometry must be confirmed.

Q: How do you control distortion on 42CrMo4 turret discs after hardening?

A: We leave 0.20-0.35 mm grinding allowance per side post-heat-treat, followed by creep-feed face grinding and dedicated Curvic tooth profile grinding. Free-state inspection fixtures are used if thin-wall deflection occurs.

Q: What is your MOQ for custom turret discs?

A: Minimum order quantity starts at 1 unit for prototype/emergency validation, with full unit-cost economics achieved at batches of >=10 pieces.

Q: Do you supply OEM brand-labeled replacement parts for Sauter/Duplomatic?

A: Supply is 100% form-fit-function compatible aftermarket components manufactured to material/tolerance specs, not branded OEM surplus.

Request a Quote (RFQ)

Submit technical data for a 24-hour engineering feasibility & cost review.
Required Attachments: STEP / IGES / PDF drawing with GD&T (or redlined OEM manual page).
IT Compliance / Secure Transfer:
Mandatory Parameters to Specify in RFQ Note:

• Annual quantity / Batch size target

• Target hardness / Material grade preference (if deviate from standard 42CrMo4 / AISI 4140)

• Required surface treatment / Coating (if applicable)

• Destination port / Delivery urgency (Breakdown vs. Scheduled production)

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