CMT - Custom Machine & Tool Co., Inc. has over 40 years of design and application experience in the synchronous drives market. CMT saw the need for an improved hub-to-shaft connection system and designed the Concentric Maxi Torque keyless system. Developed and tested using mathematical and FEA modeling, the CMT system has proven to be more reliable and easier to use than any other hub-to-shaft-connection system in the industry.
As machine and indexing speeds continue to increase and require more accuracy, engineers search for ways to reduce inertia, eliminate vibration and ensure precise component alignment. Second and third generation synchronous timing belt drive systems require higher initial tensions and produce higher torques, both of which require more robust shaft connections.
CMT designed the Concentric Maxi Torque keyless hub-to-shaft connection system to lower inertia, minimize vibration and achieve better run out control as assembled. A single screw, which never contacts the shaft, locks the split taper bushing in place and assures near perfect hub-to-shaft concentricity. Since its introduction to the market in 2000 the CMT system has never failed in the field. Engineers and machine builders have taken notice.
Some machine builders rely on set screws to connect their components to the shaft. However, set screws can damage shafts and tend to loosen and slip during clutching and braking, often resulting in shaft damage, loss of machine productivity and increased maintenance costs. Using the CMT system, components maintain their axial and radial position, reduce run out and increase machine efficiency and availability.
Similarly, keyways and clamp collars require additional machining of the shaft, adding cost and time to the project. The CMT system’s compact design and versatility saves engineers time and money by eliminating the need for secondary machining and enabling the engineer to phase the component without reducing torque capacity.
The CMT system is available in twelve bushing sizes cover bores from .125 in (2mm) to 1.1875 in (30mm). Multiple bore sizes per bushing size allows maximum “mix and match” flexibility with minimum component inventory.
The Concentric Maxi Torque keyless hub-to-shaft connection system is available in our full offering of timing belt pulleys and can be designed into any rotary motion application.
CMT is confident that you will not find another hub-to-shaft connection system or method that provides a better solution to your motion control and power transmission shaft attachment requirements. www.cmtco.com