CNC Turning Parts for Motion Control - Rollyu

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CNC Turning Parts for Motion Control

Material:AISI 304 Stainless Steel

Finish:As Machined

This custom spindle is precision turned from AISI 304 stainless steel, offering excellent corrosion resistance, strength, and durability. Designed for high-performance rotational applications, it features tight concentricity, fine surface finish, and precision-threaded sections for seamless assembly.

Rollyu Precision manufactures custom AISI 304 stainless steel spindles, using advanced CNC lathe turning and mill-turning processes to meet the precision requirements of modern motion control systems. This spindle (Part No. RY-H009) features a precision ground finish, ±0.01mm tolerance, and strong corrosion resistance, making it well-suited for servo drives, linear and rotary stages, automation equipment, and robotic assemblies.

Engineered for demanding environments, this part performs reliably in drive control, axis positioning systems, and automated machinery, as well as in vacuum applications such as UHV chambers, vacuum gauges, and microscopy platforms including motorized stages and goniometers.

We support multiple material options—including stainless steel, aluminum, brass, and high-performance plastics—and ensure compliance with RoHS/REACH standards. All parts are manufactured under ISO 9001:2015 and ISO 13485:2016, with full documentation and strict NDA protection of customer data and designs.

Whether you’re developing a prototype or scaling up for production, Rollyu Precision provides reliable CNC machining services with consistent quality and fast turnaround.

Need a custom spindle for your motion control system?
Contact us today for a quote or send your design files in SolidWorks, AutoCAD, PRO/E, UG, or PDF — we’re ready to support yo

CNC Lathe Turning, CNC Mill-Turning, Lathe, Turning, CNC Cutting, CNC Drilling, Tapping

Raw Material Selection & Preparation High-purity AISI 304 stainless steel bar stock is selected based on required diameter, length, and mechanical specs.
Bars are cut to length using precision saws (cold saw or band saw).
Ends are faced and cleaned for concentric clamping in turning machines.
CNC Lathe Turning Operations Performed on high-precision CNC lathes with live tooling if secondary milling is needed.
Rough Turning
Material is cylindrically turned down close to final dimensions.
Achieves a uniform outer diameter and removes surface scale or irregularities.
Finish Turning
Final passes are made to achieve tight tolerances (±0.005 mm – ±0.01 mm).
Surface finish is controlled to meet Ra ≤ 1.6 µm (or as specified).
Critical spindle features such as shaft steps, shoulders, or journal fits are machined.
Grooving, Threading, or Chamfering (if required)
Threads, O-ring grooves, or locking features are lathe-turned as per customer drawing.
Chamfered or radiused edges ensure smooth fit and ease of assembly.
Secondary Machining (If Applicable) If spindle has flats, keyways, or cross-holes, the part may undergo:
Milling (3-axis or 5-axis CNC)
Gun drilling or deep-hole boring
Broaching or EDM for key features
Surface Treatment (Optional) Passivation: Enhances corrosion resistance by removing surface contaminants
Polishing or Grinding: Achieves mirror-like surface or sub-micron accuracy for journal bearings
Bead blasting: For matte, non-reflective finishes in sensor applications
Inspection & Quality Control Dimensional checks using micrometers, CMMs, and runout testers
Concentricity, roundness, and shaft diameter measured to ensure smooth rotation
Surface roughness testing if required by drawing
✅ Spindles used in motion control must rotate smoothly, align precisely, and withstand dynamic loads.
Packaging & Documentation Protective packaging to avoid scratches during transport
Supplied with material certificates, RoHS/REACH compliance, and full inspection reports
Serialized if needed for traceability in regulated industries (e.g., medical, aerospace)

Engineered for Motion Control, Robotics & High-Precision Automation Systems

Custom lathe-turned spindles made from AISI 304 stainless steel play a pivotal role in high-performance motion systems across industries such as robotics, semiconductor, medical, and photonics. Designed for tight tolerances, smooth rotation, and corrosion resistance, these spindles support dynamic positioning and actuation in cleanroom and harsh environments alike.

Industry Applications Application Examples
Core Applications Linear Motion Guide Spindles Used in motorized stages and actuator assemblies to ensure accurate translation in axis-based motion systems.
Rotary Motion Spindles & Pivot Shafts Support smooth, repeatable movement in goniometers, rotary stages, and motorized rotary modules.
Medical Imaging & Lab Automation Equipment Provide structural alignment and rotational stability for scanners, specimen platforms, and automated optical inspection units.
Robotic Joint Components & Drive Pivots Deliver reliable performance in multi-axis robotic arms, end effectors, and articulated automation solutions.
Precision Mechatronics & High-End Consumer Devices Enable motion-critical features in advanced mechanical assemblies, including camera gimbals, smart optics, and motion-enabled instruments.
Integrated Motion Control System Applications Servo Motion Control Systems
Axis Control and Positioning Modules
Automation & Robotics Control Platforms
Factory Motion Control Systems
Linear & Rotary Motion Actuators
High-Speed Drive Control Systems		  Ideal for OEMs and integrators building dynamic positioning, stabilization, or handling systems.
Specialized Use Cases Motorized Linear & Rotary Stages For lab instrumentation, wafer handling, and photonics alignment
Goniometers Angular motion control in precision optics and X-ray positioning
Automated Microscopy Platforms Smooth spindle-based motion for imaging and scanning
Vacuum & UHV Applications Stainless steel performance under low outgassing and high cleanliness requirements
Semiconductor, Laser, and Photonics Equipment High-precision rotational support in fabrication and alignment tools

Part number: RY-H009

Materials Available: Stainless Steel, Steel, Aluminum, Brass, Plastic, etc.

Tolerance: ±0.01mm

Material Certificates: Available

MOQ:1 piece

Drawing Accepted: PRO/E, Auto CAD, SolidWorks, UG, CAD / CAM / CAE, PDF

RoHS/REACH Report: Available

Certificate: ISO9001:2015, ISO13485:2016

Non-disclosure agreement: Strictly sign a confidentiality agreement NDA to give you peace of mind

Other CNC Parts

Email Us: mitani@rymachining.com

FAQ

Why is AISI 304 stainless steel suitable for motion control system spindles?

AISI 304 offers a strong balance of mechanical strength, corrosion resistance, and machinability, making it ideal for spindles operating in motion control systems. It performs reliably in cleanroom, automation, and humid environments, ensuring long-term durability and minimal maintenance.

What are the key performance requirements for CNC-turned spindles in motion systems?

Precision spindles must meet strict criteria for:

  • Dimensional accuracy(typically ±0.01 mm or better)
  • Concentricity and roundness
  • Smooth surface finish (Ra ≤ 0.8 µm)
  • Axial and radial load tolerance
    These characteristics ensure stable rotation, minimal vibration, and accurate linear or rotary motion.
Do you provide custom spindle designs with features like threading, cross-holes, or keyways?

Yes. We manufacture fully custom spindles with optional features such as:

  • Internal/external threading
  • Cross-drilled holes
  • Milled flats or keyways
  • Custom flange or shaft ends
    Each spindle is machined to exact specifications using multi-axis lathes and live tooling setups.
What surface treatments or finishing processes are available for these spindles?

To enhance corrosion resistance and performance, we offer:

  • Passivation (ASTM A967 / AMS 2700)
  • Electropolishing for ultra-smooth surfaces
  • Grinding and polishing for tight-tolerance shafts
    These finishes are critical for smooth motion, bearing fitment, and surface wear reduction.
What quality controls are in place for motion control spindles?

Each spindle undergoes:

  • 100% dimensional inspection using CMM and micrometers
  • Concentricity and runout checks
  • Material certification (304 SS, 303SS, etc)
  • ISO 9001 and ISO 13485-compliant manufacturing processes
    Optional PPAP and SPC data are available for OEM clients in automation, robotics, and motion control industries.

Outstanding Achievements and Partnerships

We take pride in our outstanding achievements and strong partnerships. Our commitment to great communication, service, and integrity has led to excellent results.
Join us as a valued partner, and together, we can make a positive impact on CNC.
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  • info@rollyu.com
  • +86-15219497088
  • 3/F Building/9, 98 Industrial Park, Wanfeng Community Center Road, Xinqiao Street, Baoan District, Shenzhen City, China
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