Custom, Precision Gear Products

Custom, precision gearheads and
gear products for demanding applications


Gearhead Assembly

GH3295 Gearhead

GH3383 Gearhead



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)