: Use compressed air or a soft brush to remove dust from the gear trains.
Proper maintenance is critical to prevent wear on the delicate brass teeth of the differential gear train. Winding and Time Setting (Spring-Wound Models)
Operating a 6B requires a specific sequence to ensure the mechanical gears engage correctly with the ticket.
Remove the outer casing screws and lift off the top cover plate. cal6b calculagraph manual
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The beauty of the Cal6B lies in its two-lever system (usually a left lever and a right lever). Step 1: The Start Punch
The exact model sits at a crossroads. Our research shows three possibilities: : Use compressed air or a soft brush
Insert your time card into the front slot until it hits the backstop. Pull the forward and release. This prints the "initial" time dials. At this stage, the elapsed time pointers are at zero. Step 2: The Finish Punch
– Following the naming pattern of the CAL 8B, the CAL6B would be a six‑channel digital reminder and chef timer, similar to the CAL 8B but with six independent countdown channels instead of eight. The CAL 8B manual provides detailed setup and operating instructions for its family of devices.
: Apply oil sparingly using a fine wire oiler. A single drop smaller than a pinhead is sufficient for each pivot point. Remove the outer casing screws and lift off
For decades, the was an indispensable tool in the telecommunications industry, specifically designed to accurately record the elapsed time of toll telephone calls. The Calculagraph Model 6 (often referred to within documentation as part of the Cal6b or 6 series) was a marvel of mechanical engineering. It not only kept time but also acted as a printing clock that produced a permanent, physical record of a call's duration.
Last updated: June 2026. This guide is based on available documentation for the Calculagraph Model 6, CAL 8B, and related devices. If you have a specific version of the CAL6B not covered here, please refer to the manufacturer’s documentation or contact a collector community for assistance.
The Calculagraph Cal6B is a mechanical masterpiece of industrial timekeeping. For decades, these robust, gear-driven machines served as the backbone of the telecommunications industry, accurately calculating and printing elapsed time for long-distance telephone calls. Today, they are highly prized by horologists, vintage tech collectors, and industrial historians.