Sankyo Sandex 11DU R80-20RCB10 Indexing Drive Gear Reducer 7TF-12A Torque

Sankyo Sandex 11DU R80-20RCB10 Indexing Drive Gear Reducer 7TF-12A Torque Limiter

This is a Sankyo Seisakusho Sandex series cam indexing drive assembly, model 11DU-01249R-LR3A5/X, with an integrated R80-20RCB10 gear reducer and a Sankyo 7TF-12A torque limiter mounted on the output. Sankyo Seisakusho, headquartered in Tokyo, Japan, is one of the most respected manufacturers of precision cam indexing drives worldwide. The Sandex line uses a barrel cam (globoidal cam) mechanism to convert continuous rotary input into precise intermittent indexed output motion. Input is via a timing belt pulley and the output flange delivers accurate, repeatable positioning for automated assembly and production machinery.

Specifications & What's Included

• Manufacturer: Sankyo Seisakusho Co., Tokyo, Japan
• Series: Sandex Indexing Drives
• Indexing Drive Model: 11DU-01249R-LR3A5/X
• Gear Reducer Model: R80-20RCB10 (Sankyo Seisakusho Reducers)
• Torque Limiter Model: Sankyo 7TF-12A
• Bonnoc Lubricant Grade: M460 (Nisseki) — per nameplate sticker on housing
• Input drive: timing belt pulley (toothed pulley visible on input shaft)
• Output: large circular flange with multi-bolt pattern for indexing table or tooling attachment
• Secondary output: small shaft on 7TF-12A torque limiter gearbox (for auxiliary or signal use)
• Proximity sensor bracket present on output flange side
• Drive housing: cast iron/steel, olive/gold industrial finish
• Unit is fully assembled: indexer, gear reducer, and torque limiter as one integrated assembly

Applications

Sankyo Sandex cam indexing drives are used in automated assembly lines, dial-plate (rotary table) machines, packaging equipment, pick-and-place systems, welding fixtures, and multi-station manufacturing cells. The barrel cam mechanism delivers smooth, vibration-free indexing with a dwell period that allows tooling to engage the workpiece while the table is stationary — a core requirement in high-speed, high-precision production. The 11DU designation indicates the number of dwell positions and the output flange size class, making this unit suited to medium-duty multi-station assembly or inspection machinery. The R80 series gear reducer steps down the motor input speed to the appropriate cam input speed, while the 7TF-12A torque limiter provides overload protection — disengaging the drive if a jam or excess load is encountered, protecting both the cam mechanism and the downstream tooling. These assemblies were widely used in Japanese and global precision manufacturing from the 1980s onward and remain in active use in legacy production lines, rebuild projects, and custom automation builds.