Concentric Maxi Torque

A primer on the technology and its application

WHAT IS THE CONCENTRIC MAXI TORQUE?

• CMT is a revolutionary keyless tapered bushing & shaft-to-hub connection system.
• Developed initially for the synchronous drives market.
• Designed and patented by Custom Machine & Tool Co., Inc.
• Patent No. 6,568,063

 WHY CUSTOM MACHINE & TOOL CO., INC. DEVELOPED THE CMT BUSHING SYSTEM

Custom Machine & Tool Co., Inc, through 40 years of design and application experience in the synchronous drives market, saw a need for a technologically improved hub-to-shaft connection system.

• As machine speeds and indexing requirements continue to increase reduction in inertia and vibration becomes important.
• Synchronous timing belts and system components will last longer, go faster and be more accurate when tension excursion is minimized through better run-out control.
• Component alignment and run-out are more critical at higher speeds.
• There was not a high quality compact bushing system available for shaft sizes under 1” diameter.
• Most connection systems require extra component mass to make the connection.
• Second and third generation synchronous timing belts are capable of production higher torques requiring stronger shaft connections.

CMT TECHNOLOGY

CMT is a unique bushing attachment system: a single set screw locks the low-taper-angle split bushing in place and eliminates all of the existing attachment issues.

• Bushing system is engineered to assure full surface contact and even clamping pressure with a single set screw.
• Set screw size optimized to provide holding torque in line with shaft diameters and component torques.
• Developed using mathematical and FEA modeling.
• Scalable to any shaft/bore size requirement.
• Lower inertia and better shaft-to-component balance.
• System design assures near perfect hub-to-shaft concentricity when assembled.

CMT BUSHING SYSTEM vs. OTHER SHAFT CONNECTION SYSTEMS

Easiest and fastest system to assemble and disassemble

CMT Bushing System Benefits

Set Screws:  CMT has higher torque capacity, lower component run-out, better alignment, and no shaft distortion.

Keyways:  CMT has no movement under reversing conditions, maintains both axial and rotational position, and allows for phase control during assembly, increased shaft contact decreases run-out.

Pins:  CMT has higher torque capacity, decreased component run-out, and phase control during assembly, easier assembly/disassembly, reusable.

Clamp Collars:  CMT requires less space, lower inertia, 360° uniform clamping pressure, lower cost, eliminates component wobble, multiple bore sizes per component.

Other Attachment Systems:  CMT requires less space, lower inertia, lower cost, smaller outside diameter for minimum component size with maximum bore.

CMT PRODUCT FAMILY

Custom Machine & Tool Co., Inc. has developed its CMT bushing system, through scalable technology, to meet a wide variety of popular, as well as custom, hub-to-shaft combinations.

• Imperial & metric bore size coverage from .125” to 1.1875” and 3mm to 30mm
• Torque capacities from 14 in-lbs (1.5Nm) to 2,795 in-lbs (315 Nm)
• Multiple bore size offerings per bushing size allowing for maximum mix & match flexibility with minimum components
• Withstands repeated assembly and disassembly with no shaft damage and without a reduction in torque capacity
• Flexible positioning accuracy provides easy phase adjustment

 CMT BUSHING SYSTEM APPLICATIONS

Custom Machine & Tool Co., Inc., an innovative designer and market leader, can apply the CMT bushing system in solving your most demanding hi-tech synchronous drive and rotating component problems.

• High speed indexing and reversing in systems using timing belt pulleys and gears
• Systems requiring a high level of component rotational positioning accuracy and precise run-out control
• Designs where reduced inertia and low vibration are desired
• Components required to be assembled and disassembled multiple times during their life
• Rotating mechanisms requiring compact space
• Devices requiring high reliability with minimal maintenance

CMT BUSHING SYSTEM PRODUCT OFFERING AND CUSTOM SOLUTIONS

We do it all in small to mid-sized timing pulley applications. Our manufacturing capabilities provide flexibility and low total cost solutions. We are specialists in product customization.

Timing Belt Pulleys

• MXL (.080”), XL (.200”), L (.375”), H (.500”)
• 3mm, 5mm, 8mm HTD® Profile
• 2mm, 3mm, 5mm, 8mm PGGT® Profile
• T2.5, T5, T10
• AT3, AT5, AT10
• 40DP (.0816”)
• Zero Backlash

Custom Products

• Idler Pulleys
• Round Belt Pulleys
• Feed Rollers
• Spur Gears
• Poly-V Pulleys
• Sprockets

 WHERE CAN THE CMT BUSHING SYSTEM HELP YOU?

• Component Alignment and Timing
• Reversing Problems
• Inertia and Space
• Vibration Issues

CONCENTRIC MAXI TORQUE

A Technically Superior Solution

• Quicker assembly than other systems
• Higher holding reliability – lower maintenance
• Improved shaft-to-hub concentricity – less run-out
• Multiple bore sizes available per bushing size
• Reduced inertia for increased power savings
• Compact design fits in tighter spaces
• Cost competitive with all other attachment systems

https://www.cmtco.com/concentric-maxi-torque