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General Engineering
Design torque ratings, dimensional data, application & operation information is listed on this website for the purpose of familiarizing the new user with our catalog products and to provide a reference resource for our customers. Mach III Clutch, Inc. strongly encourages contact with our engineering staff for selection assistance or operating questions.
Scroll to read all application & operation notes, or click on a topic below:
Torque
- All listed catalog design torques are dynamic values rated at 80 PSI.
- To achieve full design torque new units must be cycled several times under load to burnish the wear surfaces. The exact length of time to achieve burnishing varies by application.
- All torque ratings are subject to variations caused by temperature, humidity, wear, and contamination.
- Where possible, selections should be made such that the desired operating torque falls well within the capacity of the chosen model to allow for unforeseen load conditions.
- For all air applied clutches and brakes the torque output is linear with respect to air pressure. To calculate required pressures use the following:
Required PSI = |
Required Torque x 80
Design Torque |
Service Factor
- When calculating required torque always use a service factor of 1.5 to 2. It is not recommended to select a clutch, brake or torque limiter for use at its maximum rated torque for continuous duty.
- Increased service factors are advised for systems including any of the following:
- Gas or Diesel engine drives
- High Inertia loads
- Rough driven loads
- High cycle rates
RPM
- For all applications running excess of 1800 RPM please consult the factory.
- Bushing mounted pilot designs are intended for low speed applications only.
- Larger clutches may require balancing for high-speed applications. Please consult the factory.
Air Supply
- MAXIMUM RECOMMENDED AIR PRESSURE IS 80 PSI.
- Dry, filtered and regulated air is recommended. Air lubrication is NOT required.
- For best response, control valves should be located as close to clutch or brake as practical.
- Where faster exhaust times are necessary quick exhaust valves are available.
Mounting
- Anti-Rotation Restraint
Some clutches and all combination clutch/brakes require installation of an anti-rotation arm. The user-applied restraint should not apply any axial force to the clutch.
- Shaft-To-Shaft Applications
For shaft-to-shaft coupling applications flexible couplings are recommended. Where rigid couplings are used great care must be exercised to assure proper alignment to prevent premature clutch failure.
- Vertical Mounting
Catalog standard clutches and brakes are designed for horizontal mounting. In most cases vertical mounting can be accommodated with little or no modification. Please consult the factory.
Break-In Period
- New clutches, brakes and torque limiters may require a brief period of use to burnish the wear surfaces before full design torques are achieved. The exact length of time varies by application.
Operating Environment
- Special designs are available for applications where the clutch, brake or torque limiter will be exposed to any of the following:
- Water
- Corrosive chemicals
- Extreme temperatures
- Contaminants (Grease, Oil, Dust, Grit)
- Products with food-grade exteriors are available.
Thermal Capacity
- Tensioning Applications
Brakes and clutches used in continuous slip applications must be selected based on their ability to dissipate heat as well as provide the required torque. The SensiFlex series is designed specifically for slip applications. Please refer to the Thermal Horsepower vs. RPM curves shown for the selected SensiFlex unit to confirm adequate capacity.
Thermal HP =
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Required Torque(lb-in) X Slip RPM
63000 |
- High Cycle Rates
Clutches and brakes generate heat during each engagement. Over heating can occur in cases where high cycle rates are combined with high engagement RPM, high inertia loads, and/or clutch and brake overlap.
- Forced Air Cooling
For high heat applications forced air cooling can significantly enhance performance.
Product Identification
- Product identification numbers and the date of manufacture are stamped into the housing, generally on the end of the assembly containing the air inlet (clutches & brakes) or adjustment nut (torque limiters). To facilitate factory assistance it is helpful to have these numbers available. Click here to access the guide to locating this information on the product.
Finished Bore & Keyway Specifications
- Bore and Keyway sizes are available in either metric or US dimensions up to the maximum shown for each model.
- The maximum bore sizes listed for each product represent the largest possible with a standard, square (English) or rectangular (Metric) keyway. In most cases, products can be bored to 1/16 (.0625) inch larger than the published maximum with a standard rectangular keyway.
- Bore Tolerances = Class RC3
Installing Sprockets & Pulleys
- Mach III will provide and install the required sprocket, pulley or v-belt sheave on any clutch, clutch-brake or torque limiter for a nominal charge.
- Dimensional information is provided for customers wishing to field install a sprocket, pulley or v-belt sheave. To obtain dimensions for a non-catalog product, please contact Mach III.
- Pilot Tolerances = Class RC5
Torque Limiter Cautions
- Friction style torque limiters are designed to protect drive components against momentary overloads only.
- Machine failures that result in prolonged slip of the torque limiter will result in severe over heating if the fault condition goes uncorrected.
Safety Considerations
- Mach III products include rotating components and should be guarded according to OSHA requirements and other applicable federal, state & local regulations. It is the responsibility of the user to provide the necessary guarding.
- Mach III uses only non-asbestos friction linings.
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