Gauge

Hobbing Mandrels

Nomenclature

  • Hobbing mandrel
  • Expanding mandrel
  • Solid mandrel
  • Hydraulic mandrel
  • Collet mandrel

Selection and Ordering

Choose solid mandrel for high repeatability on same-size workpieces.

Select expanding collet mandrel when you need flexibility for multiple bore sizes.

Choose hydraulic or LeCount style for highest accuracy and reduced runout.

  • Specify bore size range, concentricity tolerance, jaw type, and chucking style
  • Examples: expanding collet mandrel, 50 to 60 mm range, 0.005 mm TIR
  • Example: hydraulic mandrel for 40 to 45 mm bores, 0.0025 mm TIR

Care and Maintenance

  • Clean mandrel and workpiece after use to prevent debris build-up
  • Store in a dry environment and coat with anti-corrosion oil
  • Check concentricity periodically with a dial indicator or master gauge
  • Hydraulic mandrels should be pressure tested and resealed as needed

Description and Features

Hobbing mandrels are workholding tools used in hobbing machines for gear cutting, spline cutting, and sprocket machining.

They ensure accurate concentric holding of gear or spline blanks by expanding against the bore or holding externally.

Manufactured per customer specifications and available in different types and sizes.

  • Solid mandrels for fixed bore sizes
  • Expanding collet mandrels that adjust to varied bore sizes via mechanical expansion
  • Hydraulic expanding mandrels offering superior concentric accuracy (~0.0001 in TIR)
  • LeCount style three-jaw expanding mandrels with 0.0001 in TIR and wide bore range from 0.25 to 7.0 in

Common Uses

  • Holding gears between centers for hobbing and inspection
  • Machining splines and sprockets accurately
  • Final inspection of gear teeth with metrology machines
  • Grinding operations with robust 'grind' mandrels

Scope of Supply

Available as solid, collet expanding, hydraulic expanding, and LeCount style mandrels.

Customizable bore ranges and sizes as per customer requirement.

Optional features: hydraulic activation, hardened surfaces, calibration certificates.

Applicable Types and Sizes

  • Solid mandrels made to match a single bore size
  • Expanding mandrels with collet ranges of 0.015 to 0.020 in
  • Hydraulic mandrels with TIR accuracy of 0.0001 in
  • LeCount expanding mandrels covering 6.35 to 177.8 mm (0.25 to 7.0 in)

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