Textile Machine Doffer Shaft

Name: Doffer Shaft for Yarn Extraction in Spinning – Frigate
Price: 249.00 USD
Availability: InStock

Textile Machine Doffer Shaft performance is critically dependent on maintaining strict axial and radial alignment. Deviations in shaft straightness or runout beyond ±10 microns can result in asynchronous contact with doffer rollers, causing inconsistent yarn removal and leading to drafting tension fluctuations. These shafts are manufactured using cylindrical grinding and in-process laser alignment to meet sub-micron concentricity, ensuring repeatable performance across high-speed spindle frames.

Overall Length

1000–4000 mm (±0.5 mm/m), Custom lengths up to 6000 mm (±1 mm/m)

Shaft Diameter(s)

30–150 mm (±0.02 mm), Stepped – ±0.05 mm per transition, Taper – 0.03 mm/100mm

Material Specification

4140 Alloy Steel (QT, 28–32 HRC), 17-4PH SS (H900, 40–45 HRC), or EN24T (AISI 4340)

Runout Tolerance (TIR)

≤0.05 mm/m (Static), ≤0.1 mm/m (Dynamic at max RPM)

Surface Finish

Bearing Journals – Ra ≤0.4 µm, General – Ra ≤0.8 µm, Keyways – Ra ≤1.6 µm

Product Description

The Textile Machine Doffer Shaft undergoes continuous torsional cycles due to repeated engagement during yarn transfer. Substandard metallurgy often leads to crack initiation at spline roots or keyway corners. Each shaft is produced from quenched and tempered high-strength alloy steels (typically 42CrMo4 or EN24) and validated through torsional fatigue simulation using finite element analysis. Resulting fatigue limits exceed 10⁶ load cycles at application-specific stress ranges.

Keyway/Spline/Gear Interface

Keyway – DIN 6885 (h9 tolerance), Spline – DIN 5480 (H7/h6), Gear – AGMA 2000-C95 (Class 8)

Bearing Journal Specifications

Diameter – h6/g6 tolerance, Hardness – 50–55 HRC (if hardened), Roundness – ≤0.005 mm

Hardness (Heat Treatment)

Bearing Zones – 50–55 HRC (induction hardened), Body – 28–35 HRC (for shock absorption)

Dynamic Balance

G2.5 (ISO 1940-1), ≤1.5 g·cm residual unbalance (for >1500 RPM)

Certification Standard

ISO 9001, ASTM A322 (Alloy Steel), DIN 17200 (Case Hardening), ISO 1940-1 (Balance)

Technical Advantages

Rotational stability of the Textile Machine Doffer Shaft depends on minimizing frictional resistance and maintaining surface integrity under dry and semi-lubricated conditions. Surface finishes are held below Ra 0.2 μm, achieved through sequential precision turning, burnishing, and diamond polishing. Friction-modifying coatings such as hard chromium (HV 950+) or DLC are applied to reduce adhesive wear, particularly where doffer sleeves or bushings are used without full fluid film lubrication.

Load transfer efficiency from the Textile Machine Doffer Shaft to housing bearings requires consistent shaft shoulder geometry and controlled interference fits. Journal diameters are ground to IT6/IT7 tolerance bands with controlled chamfers to prevent stress risers. Fillet radii at shoulder transitions conform to ISO 5821 to avoid stress concentration at load transfer points, improving shaft life under axial thrust and radial load conditions.

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Industry Applications

Ring Spinning Frames

Supports controlled yarn removal from drafting zone to bobbin during continuous spinning cycles under high-speed and high-tension conditions.

Roving Frames

Ensures accurate transfer of roving slivers by maintaining shaft-to-roller alignment during doffing and buildup operations.

Carding Machines

Facilitates synchronized doffing of carded fiber web, maintaining even fiber flow and roller-to-shaft load balance.

Comber Machines

Drives intermittent roller motion for removing short fibers, requiring precise angular indexing and torque handling by the doffer shaft.

Compact Spinning Systems

Maintains tight positional tolerances for compacting rollers during yarn transfer, ensuring fiber alignment and minimum slippage.

Open-End Rotor Spinning Machines

Transmits rotational motion to doffer assemblies for continuous yarn detachment, demanding torsional stiffness and vibration damping.

Corrosion Protection in High-Humidity Zones

Textile Machine Doffer Shafts are frequently exposed to ambient moisture, fiber-laden air, and occasional contact with alkali-based cleaning agents. To counter corrosion and surface pitting, shafts are treated with electroless nickel plating or thermally diffused zinc-iron coatings depending on operational exposure class. Protective systems are tested per ASTM B117 salt spray standards for extended resistance in humid environments common in spinning halls.

Temperature fluctuations due to frictional heating or ambient conditions cause shaft elongation and radial expansion. The Textile Machine Doffer Shaft is engineered with low thermal expansion alloys (α ≤ 12 µm/m·K) and incorporates expansion-compensated support shoulders to maintain dimensional integrity. Shaft growth is simulated under dynamic load cases to ensure consistent alignment with rollers and minimal thermal distortion during prolonged shifts.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate control axial runout in the Textile Machine Doffer Shaft during high-speed spinning?

Frigate uses centerless grinding and in-process laser alignment to maintain axial runout within ±10 microns across the full shaft length. This precision ensures stable rotation and uniform yarn take-up in high-RPM conditions. Each shaft is inspected using dial indicator methods and CMM validation for concentricity. This minimizes misalignment-induced yarn irregularities during high-speed spinning.

What makes Frigate’s Textile Machine Doffer Shaft suitable for chemically aggressive textile environments?

Frigate offers shafts with electroless nickel or zinc-iron coatings based on ASTM B117 corrosion resistance standards. These treatments withstand exposure to textile lubricants, humidity, and alkali-based cleaning agents. The shafts retain surface integrity and avoid pitting, even in damp mill conditions. This extends service life without compromising dimensional tolerances.

How does Frigate ensure correct bearing fits in its Textile Machine Doffer Shaft assemblies?

Frigate machines bearing journals to IT6 tolerance using precision cylindrical grinding. Fillet radii and chamfers follow ISO 5821 to prevent stress concentrations during load transfer. Each shaft undergoes bearing fit inspection using gauge-based verification methods. This guarantees proper seating, reducing bearing wear and vibration.

Can Frigate customize the Textile Machine Doffer Shaft for non-standard drive end configurations?

Frigate provides shafts with custom splines, keyways, or tapers as per DIN 5480, ANSI B92, or OEM-specific profiles. End geometry is machined using multi-axis CNC lathes with angular orientation accuracy under 0.1°. Induction hardening at contact zones ensures high surface hardness above 58 HRC. This enables compatibility with diverse machine platforms without retrofitting.

How does Frigate validate the torsional strength of its Textile Machine Doffer Shaft?

Frigate performs finite element analysis (FEA) on each shaft design to simulate real-world torsional load cycles. Shafts are manufactured from heat-treated alloy steels like EN24 with known fatigue properties. Post-machining, torsional tests confirm yield behavior and failure thresholds. This ensures that shafts resist cyclic torque without deformation or fracture during prolonged use.

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Registered Office

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

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

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