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Graham Transmissions, the most recognized name in metallic traction drives, has perfected the Ring-Roller.

Why sacrifice efficiency, accuracy, or range when you need a variable speed drive? Choose the Graham Ring-Roller and retain the advantages of a straightline induction motor drive and a drive which produces increased torque at the speeds where you need it most.

While no infinitely variable speed drive can correctly be termed “positive” the Graham Ring-Roller provides better speed regulation with change in load than other types.

Speed is unaffected by stretch of belts, change of resistance or wear of parts. Get the Graham Ring-Roller and you get a compact, one piece package of transmission, reducer, motor and control.

Features of the Graham Transmissions Ring Roller

Micrometer Handwheel Control on Unit or Remote
Unmatched Accuracy

Overload Protection
Wide Choice of Controls
Linear Speed Setting Mechanism
Torque Producing Elements Operate in the Presence of Traction Lube in Sealed Housing
Infinite Speed Range, Forward and Reverse
Full Torque Available to Zero RPM
Employs Compound Planetary Gear System With Control Ring and Tapered Rollers
Oil Lubricated and Cooled
Completely Mechanical
Wide Choice of Input Configurations, Motorized or Non-Motorized
Wide Choice of Output Configurations Including Speed Reducers and Increasers
Output Torques Up to 8000 in. lbs.
Virtually Maintenance Free
Call now to purchase a Ring-Roller traction drive.