Custom, Precision Gear Products

Custom, precision gearheads and
gear products for demanding applications


Bowmar’s gearheads, gear boxes, speed reducers, speed increasers and gear assemblies are designed for use in high-accuracy electromechanical systems which require precise control of speed, torque, position, and lost motion.

Typical Applications

  • Actuators
  • Position feedback sensors
  • Force feedback devices
  • Valve control
  • Instrumentation
  • Robotics
  • Automation equipment
  • Motion control and positioning devices

Gearhead Capabilities

  • AGMA Class – 12 maximum
  • Minimum Size 5 (0.5” diameter)
  • Gear Ratios – 1:1 to 48,000:1
  • Backlash (Lost Motion) – Minimum 20 arc minutes
  • Types – Planetary, Spur, Bevel, Straight, Right-Angle, Reversing, Direct, Multiple Shafts, Coaxial
  • Micro-precision ball bearings
  • Self-lubricating bushings
  • “Postless” Construction – Housing is an integral part of the gearhead for lighter, more rigid construction. Improved shock and vibration resistance.
  • Rear bearing plate is positively positioned for perfect bearing alignment.
  • Unique cluster design includes a gear and pinion hobbed from the same centers; providing greater concentricity and reducing total composite error.

Gear Capabilities

  • AGMA Class 13 maximum
  • Materials – Stainless Steel, Brass, Bronze, Aluminum, Composite, Plastic
  • Sizes – 0.079 inch (2.0mm) to 7.875 inch (200mm) diameter
  • Pitch – 12 to 400 Diametral pitch
  • Types – Spur, Helical, Bevel, Worm (single or multiple leads), Internal Ring, Planet, Pinion, Cycloid, Ratchet, Escapement, Anti-Backlash, Special Form

Machining Capabilities

  • Precision gear cutting: Micron, Fellows, and Barber Coleman hobbing and shaping equipment
  • Precision boring: Diameter tolerances to +/- 0.0001 inch, center distance tolerances to +/- 0.0001 inch
  • CNC Milling: +/- 0.0002 inch accuracy
  • CNC Turning: +/- 0.0001 inch tolerance
  • OD Grinding: +/- 0.00001 inch tolerance
  • Surface Grinding: +/- 0.0001 inch tolerance

Inspection Equipment

  • Starrett Video Measuring System – Programmable, CNC Controlled, 1 Micron Accuracy
  • Vari-Role Gear Measuring (measures composite error and center distance)