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For over 50 years, Zero-Max has created innovative solutions to motion control problems. Together with Zero-Max, we can engineer a solution to solve your motion control requirements. Some Zero-Max Drives may be purchased with standard electric motors or they may be connected to any rotating power source up to 2000 RPM. Over 1 million Zero-Max Drives have been put to work in a wide variety of applications. They are available from distributors in all major markets throughout the world.

Crown Drives

Crown® Gear Drives are available with 1:1 and 2:1 ratios. High quality AGMA class 10 spiral bevel gears. Stainless steel shafts and aluminum housings are standard on all Crown® Gear Drives.

Adjustable Speed Drives

Easy to install and maintenance free. Zero-Max Drives offer infinitely variable speeds from 0 rpm to 1/4 of input rpm. 5 models with torque ranges from 12 in-lbs to 200 in-lbs.

CD Coupling

These high performance couplings out last bellows and steel disc design couplings. The unique design of the composite disc enables the CD Couplings® to withstand punishing applications and deliver high precision performance.

Schmidt Couplings

Schmidt® Offset Couplings are designed to handle high amounts of parallel offset up to 17.00″. Standard models with torque capacities up to 459,000 in-lbs.
How to select a right angle crown gear drive
  1. Determine Your Preferred Input/Output Ratio. Standard ratios are 1:1 and 2:1. It is also possible to use a step up ratio of 1:2 by using shaft #2 as the input shaft. (See drawings on pages 3–5).
  2. Designate Which Shafts Are To Be Input And Output Shafts. This step is especially important to determine that no shaft will turn faster than 2000 RPM. If shaft #2 in the 2:1 ratio models is selected as the input shaft, it can turn at a maximum of 1000 RPM. In the 1:1 ratio models it makes no difference. However, the choice in either case will affect your mounting.
  3. Be Certain That The Designated Output Shaft Has A Torque Capacity Greater Than Your Applications Load. Consult the tables on the pages 6-8, and be sure to apply the service factors from the chart below.
  4. Choose Drive Type. Use either 2-way or 3-way configuration.
  5. Select The Correct Model Number. On pages 3–5, select the correct model number; note that units with 3/8 inch shafts have flats and units with 1/2, 5/8, 3/4 and 1 inch shafts have standard keyways. Also note that 1 inch shaft models are available in 3-way type only.
  6. If modifications of shafts and/or housings are required for your application, send a drawing and a description of the application to the factory.
Features of the Adjustable Speed Drive

Features of the Adjustable Speed Drive

  • Compact and easy to handle.
  • Simple to install. No special wiring or training.
  • Easy to operate with lever or screw control. Repeatable
  • Use adjustable speed drives anywhere on machine. Accepts input to 2,000 RPM. Ideal secondary controller.
  • Delivers constant torque throughout the speed range.
  • 4:1 speed reduction. Drive is often usable without additional speed reduction.

Adjustable Speed Drive Benefits

  • Permits slow or fast, small or large speed changes. Speed set-ups are made quickly and easily. Ideal for dancer applications / constant speed changes.
  • Leave drive at one setting. No daily speed cycling.
  • Accurate speed holding. No “wear-in” period / constant speed operation.
  • Zero-Max adjustable speed drives accepts any input. It’s the world’s most versatile, economical secondary drive.
  • Goes to zero output. Ideal for use as a clutch.
  • Simple maintenance. Factory lubricated.
  • Low cost and proven design. More than 1,000,000 sold. Ideal for users and original equipment manufacturers.
  • Sealed housing. Use in most atmospheres. Can be mounted in any position.
  • Versatile shaft / control / motor options.
  • Infinitely adjustable. 0-400 RPM speed range with 1800 RPM input.
Selecting the right CD Coupling
Information Required 
  • Service factor.
  • Continuous and peak torque requirements, and/or motor HP. • Coupling RPM.
  • Distance between shaft ends. (DBSE).
  • Misalignment requirements.
  • Physical space limitations.
  • Hub bores, with or without keyways.
  • Other environmental considerations.
Schmidt coupling styles for various applications

Offset Coupling

Provides the utmost in precision for parallel offset shafts. Transmits constant angular velocity and torque in a wide range of parallel shaft misalignments. Imposes no sideloads on shafts or bearings and eliminates radial shaft vibrations. No performance loss for increasing offset. It provides large floor space savings because of its compact design.

Inline Coupling

A linkage coupling designed with high torsional stiffness, this coupling accommodates small parallel shaft misalignments at constant angular velocity. Designed as a dropout coupling, it can be easily installed and offers excellent drive performance for low to medium shaft speeds and medium to high torque applications.

P5-D Coupling

Provides parallel shaft misalignment and a ± 5° angular misalignment with moderate axial shaft displacement capability. This coupling maintains constant angular velocity at all misalignment modes. Recommended for high torque, low RPM applications, the coupling has spherical roller bearings which are easy to maintain.