Custom Precision Gears for CNC Machine | DD Gear

Features & Benefits

• High positioning accuracy & low backlash:
  CNC Machine Gears from DD Gear are designed for low backlash and tight pitch accuracy to support precise spindle speed control, axis feed rates and indexing operations in CNC lathes, machining centers and rotary tables.
• Optimized for spindle, feed and rotary drives:
  We supply gears for spindle gearboxes, feed gearboxes, rotary tables, indexers and auxiliary drives, taking into account speed range, torque, stiffness and NVH (noise, vibration, harshness) targets for each section of the machine tool.
• Wide range of gear types for machine tools:
  Custom spur and helical gears, internal gears, gear shafts with integral gears, bevel gears and ring gears allow flexible transmission layouts, from compact headstocks to heavy-duty rotary tables and ATC drives.
• Material & heat treatment for fatigue and stability:
  Case-hardening alloy steels, nitriding steels and through-hardened alloys are selected to provide high contact-fatigue strength, bending strength and dimensional stability under continuous loading and thermal cycles.
• Small-module precision & gear grinding capability:
  Where required, ground tooth flanks and carefully controlled runout support low noise, smooth meshing and consistent contact patterns—critical for high-speed spindles and precision rotary axes.
• Support for OEM and retrofit programs:
  DD Gear can support both new machine-tool platforms and retrofit/modernization projects, producing gears based on existing drawings or measured samples, with prototype-to-series capability and traceable quality documentation.

Technical Specifications

Final data will be defined according to the customer’s drawing and sample.

Applications

CNC machine gear from DD Gear can be configured for:

• Spindle gearboxes of CNC lathes and machining centers – Spur and helical gears for multi-range spindle speed selection, balancing high speed capability with torque at low speeds.
• Feed gearboxes and axis drives – Gears that transmit motion to ball screws, rack-and-pinion systems or intermediate shafts in X/Y/Z and rotary axes, with low backlash and smooth running.
• Rotary tables and indexers – Precision ring gears and pinions or bevel gear sets for positioning and continuous rotary axes.
• Tool magazine and ATC drives – Spur and helical gears for tool magazine rotation, tool arm motion and indexing mechanisms in automatic tool changers.
• Auxiliary drives – Gears for pallet changers, coolant pumps, chip conveyors and other auxiliary systems integrated into CNC machines.

Gear Manufacturing Process

Every CNC machine gear is produced under a controlled gear manufacturing route designed for precision and durability. A typical process flow is:

1. Forging or bar cutting of shaft blanks

2. Lathe machining of shaft diameters and reference surfaces

3. Hobbing or shaping of gear teeth

4. Drilling, milling, and other CNC machining operations

5. Heat treatment (such as carburizing, quenching, tempering, nitriding)

6. Shot blasting and stress relief as required

7. Finish machining and grinding of journals and critical surfaces

8. Gear grinding (profile or worm grinding) where accuracy demands it

9. Cleaning and rust prevention treatment

10. Final inspection and packaging for shipment

Precision Gear Customization Process

To support custom CNC machine gear projects, DD Gear follows a clear, eight-step customization process:

Step 1 – Requirement Collection
Customers provide design requirements, 2D drawings, 3D models, or physical samples, together with basic duty cycle information (torque, speed, life, installation).

Step 2 – Drawing Design & Optimization
Based on the provided drawings or samples, DD Gear prepares or optimizes detailed manufacturing drawings and shares them with the customer for confirmation.

Step 3 – Quotation
After the drawings and technical points are confirmed, we issue a precise quotation covering tooling, piece price, lead time, and quality requirements.

Step 4 – Tooling & Fixture Preparation
Once the price is confirmed, we arrange tooling and fixture production. Any tooling cost is agreed with the customer in advance and can be offset or refunded after mass orders, according to the commercial agreement.

Step 5 – First Sample Approval
After tooling and fixtures are ready, we manufacture the first sample batch—typically within about 30 days—and ship it to the customer for testing.The customer inspects and validates the samples in their gearbox or test bench and provides feedback on dimensions, performance, and any required adjustments.

Step 6 – Mass Production
When the sample is approved, we start mass production according to the agreed production plan and quality standards.

Step 7 – Finished Product Inspection
After production, we inspect hardness, dimensions, runout, tooth accuracy, and other critical characteristics to ensure full compliance with the drawing and standards.

Step 8 – Shipping Arrangement
Once inspection is passed and shipment is approved by the customer, we arrange booking, packaging, and delivery to the specified destination.

Quality Assurance & Inspection

DD Gear applies the same quality philosophy to CNC machine gear and all precision gears:

• Quality management systems based on ISO 9001 and IATF 16949

• Process control from incoming material to final inspection, including:

  • Material certification and chemical composition checks

  • Hardness and case depth verification after heat treatment

  • Gear measurement for profile, lead, pitch, and runout

  • Surface roughness testing on gear flanks and journals

  • Dimensional inspection with calibrated gauges and CMMs

• Traceability for each batch with inspection records and reports

• Optional documentation such as PPAP/FAIR packs on request

Packaging

Usage & Installation Notes

• Ensure housing and shaft alignment are within design tolerances; misalignment increases noise, wear and can degrade machining accuracy.
• Observe specified fits, tightening torques and mounting procedures for gears, gear shafts and ring gears; avoid forcing components beyond tolerance limits.
• Use the recommended lubrication type, viscosity and filtration level; clean, properly filtered oil is critical for long gear and bearing life in CNC gearboxes.
• Monitor noise, vibration, temperature and backlash changes during maintenance intervals; abnormal trends are a signal to inspect gear contact patterns, lubrication condition and bearing health.
• Protect gears from contamination and corrosion during storage and handling prior to assembly, especially for ground-tooth gears used in precision spindles and rotary tables.

Company Strength – DD Gear

• Specialized in small module, high-precision gears and shafts for EVs, humanoid robots, AGVs, and intelligent automation.

• Integrated manufacturing from forging and machining to heat treatment and gear grinding.

• Quality systems aligned with automotive standards, with experience supporting OEM and Tier 1 projects.

• Engineering support covering concept feasibility, DFM reviews, and failure analysis feedback.

• Global export capability with experience serving customers in multiple countries.

Q1: What information do you need to quote CNC Machine Gears?
We typically need: machine type and function (spindle, feed, rotary table, ATC, etc.), 2D drawings and preferably 3D models, gear type (spur/helical/bevel/internal/ring), module and tooth data, material and heat-treatment requirements, shaft arrangement, speed and torque, duty cycle, target accuracy/noise level and annual volume.

Q2: Can you achieve high gear accuracy suitable for CNC machine tools?
Yes. Within the limits of our process capabilities and your design, we can manufacture gears to defined ISO/DIN/AGMA cylindrical gear accuracy classes and agreed bevel/ring-gear tolerances. The required grade will be agreed based on application (spindle, feed, rotary) and cost/performance balance.

Q3: Should I use spur or helical gears in CNC gearboxes?
Spur gears are simpler and cost-effective and can be suitable where noise and vibration are less critical. Helical gears provide smoother engagement, higher contact ratio and generally lower noise and better load distribution, but introduce axial thrust that must be accommodated in the bearing design. The final choice depends on your noise, speed and stiffness requirements.

Q4: Do you supply complete machine-tool gearboxes or only gears and shafts?
DD Gear acts as a precision gear and shaft supplier. We manufacture gears, gear shafts and related components based on your drawings. Complete gearboxes, spindle units and CNC machines are designed and assembled by the machine-tool OEM or system integrators.

Q5: Can you support retrofit or replacement gears for existing CNC machines?
If you can provide accurate drawings or samples that can be measured, we can usually produce replacement gears for existing gearboxes and rotary tables, helping support retrofit, upgrade and service programs. Final fit and performance validation remains the responsibility of the machine owner or integrator.