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Zero-Backlash Gearheads decrease weight while maintaining torque.

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Zero-Backlash Gearheads decrease weight while maintaining torque.
Zero-Backlash Gearheads decrease weight while maintaining torque.
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September 4, 2014 - Precision gearheads include CSF-LW and CSG-LW. Latter, with cross roller bearing and output flange, offers 1 arc-min accuracy, ±5 arc-sec repeatability, and peak torques from 450–60,500 lb-in. Hollow shaft Harmonic Drive® gearheads SHF-LW and SHG-LW, featuring 1 arc-min accuracy, offer gear ratios from 30:1 through 160:1 and employ cross roller bearing and output flange for direct mounting of load without additional support bearing. Largest unit has peak torque rating of 6,175 lb-in.

Harmonic Drive LLC Introduces Lightweight Gearheads

Harmonic Drive Technologies - Teijin Seiki Boston Inc.
247 Lynnfield St.
Peabody, MA, 01960

Press release date: June 17, 2014

20-30% lighter gearheads available with the same specs

Peabody, MA – Harmonic Drive LLC, a leader in high precision motion control introduces new lightweight versions of select gearhead products.  These new gearheads are ideal for designs where weight is a critical factor.

Building on the success of Harmonic Drive LLCs current CSF, CSG, SHG, and SHF gear units, new lightweight versions were the next logical evolution of the product lines.  Achieving weight reductions of 20-30% without any reduction in torque ratings, the CSF-LW, CSG-LW, SHG-LW and SHF-LW gear units provide exceptional torque density.

• CSF/CSG-LW Precision Lightweight Gearheads
Ideally suited for robotic applications, the new CSG-LW and CSF-LW gearheads are 30% lighter than previous designs without reducing the torque rating or significantly changing interface dimensions. The CSG high-torque gearhead delivers 30% more torque and 40% longer life with zero-backlash, 1 arc-min accuracy, and ±5 arc-sec repeatability. A high capacity cross roller bearing and output flange is used to support the driven load. A wide variety of sizes and reduction ratios are available with peak torques ranging from 450 in-lbs. to 60,500 in-lbs.

• SHF/SHG-LW Lightweight Hollow Shaft Gearing
SHF-LW and SHG-LW hollow shaft gearheads are 20% lighter than previous units. Available in a wide range of sizes, these zero backlash, 1 arc-min accuracy Harmonic Drive® gearheads enable design engineers to pass shafts, wires, tubing, or other components directly through the center of the gear. The gearhead incorporates a high capacity cross roller bearing and an output flange to mount the load directly without the need for an additional support bearing. Gear ratios from 30:1 through 160:1 are available. The smallest unit has a hollow shaft ID of 14 mm and an outer diameter of just 64 mm. The largest unit of the family has a hollow shaft ID of 80 mm and a peak torque rating of 6,175 in-lb.

Known for its expert engineering and manufacturing, Harmonic Drive LLC products are relied upon every day throughout the robotics, semiconductor, defense, aerospace and machine tool industries. Our products are inherently light-weight and offer high torque capacity with exceptional positioning accuracy and repeatability. We offer standard and custom engineered products to provide high performance solutions to meet the requirements for mission critical applications. Harmonic Drive® gear products offer zero-backlash with reduction ratios from 30:1 to 160:1 and are available in sizes ranging from 0.625 inches to over 10 inches in diameter.

APPLICATIONS for Harmonic Drive products:
• Robotics: Industrial, Semiconductor & Flat Panel, Humanoid, Mobile Robots
• Medical: Surgical Robots, Medical Imaging, Therapeutic, Prosthetics, Exoskeletons, Lab Automation
• Energy: oil exploration, drilling and positioning, wind power, solar
• Machine Tool: Milling Head, Tool Changer, Rotary Table, Grinding, B & C Axis
• Aerospace: Solar Array Drives, Antenna Pointing, Valve Actuators, Lunar and Interplanetary Rovers
• Defense: Unmanned Vehicles, Remote Weapon Stations, Antenna Pointing

KEY PERFORMANCE features for Harmonic Drive servo actuators, gearheads and component sets:
• True Zero Backlash
• Excellent positional accuracy and repeatability
• High Torque-to-Weight and Torque-to-Volume ratios
• Compact size
• High Reliability
• Single stage high reduction ratio

About Harmonic Drive LLC
Harmonic Drive LLC designs and manufactures precision Harmonic Drive® servo actuators, gearheads and gear component sets.  They work with industry-leading customers and companies of all sizes to provide both standard product and custom-engineered servo actuators, gearheads and gear components. Harmonic Drive LLC provides high precision, high performance solutions to meet customer’s mission critical application requirements. The majority of the products sold by HDLLC are proudly manufactured in the United States. Affiliated companies in, Japan (Harmonic Drive Systems, Inc.) and Germany (Harmonic Drive AG) provide additional manufacturing capabilities. More information can be found by visiting the company’s web site at

Colleen Anderson, Marketing Manager
Harmonic Drive LLC
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