The National Time & Signal 12M through 15M Series clock mechanisms employ the exclusive worm-gear drive technology on the largest scale, inside welded plate steel housings. Build your next stadium clock up to 50 feet in diameter with these field proven units.
National Time's largest series of clock mechanisms. Welded plate steel housings are CNC bored for precise shaft alignment and smooth operation required for clocks this size. These mechanisms support hands for dial sizes up to 50' in diameter and also utilize our reliable heavy duty worm / worm gear drive technology. In addition, all shaft bearing surfaces are outfitted with enclosed ball bearings. Hands can be advanced with continuous drive advancement or impulsed each minute depending on the end users preference. Both are achieved with the use of a 115VAC 50Hz or 60Hz synchronous high torque gear motor. The National Time & Signal 12M through 15M Series clock mechanisms have survived the destructive forces of a downtown Atlanta tornado in 2008.
| Cutsheet | Name/Description |
|---|---|
 460 | 12M through 15M Clock Movements Datasheet |
| 10149 | Wiring Diagram MC100 With 3MR, HMR, or 4MR Clocks |
| 9730-AWA | Wiring Diagram MC3-X10 With Single MR Series Synchronous Clock |
| 11014B | Wiring Diagram MC3-X10-4SW With Multiple 3MR, HMR, or 4MR Clocks |
| 9528B-AWA | Wiring Diagram 970 Switch Panel With Single 3MR, HMR, or 4MR Clock |
| 8067-AWA | Wiring Diagram 970 Switch Panel With Multiple 3MR, HMR, or 4MR Clocks |
| YouTube | Troubleshooting HMR and Larger Synchronous Clocks Video |
Explore our Hand & Dial selection tool to begin brainstorming for your project. Choose the perfect hands and dials to match your architectural style & our sales engineers will help you with the rest!
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