Motion Control – Steinmeyer Tutorial – Ball Screws – Maximum Load!

Motion Control Components - Steinmeyer Cooled Ball Screws

 

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Tutorial presented by Steinmeyer – Their Ball Screws are specially manufactured for dynamic performance

BURLINGTON, MA –Motion Control Tutorial – Ball Screws – Maximum Load

There are five ways a ball screw may fail due to overload:

  • Excessive dynamic loading, which means the screw makes too many revolutions under a certain load resulting in material fatigue. This can be avoided by selecting a ball screw with sufficient dynamic load capacity (or by reducing the number of revolutions and/or reducing the load). This is the subject of the load capacity discussion.
  • Exceeding the static load capacity, which causes instant and permanent damage to the ball screw due to brinelling of balls and races, and prevents any further normal operation of the ball screw. Static load capacities are listed as technical data.
  • Buckling of the shaft under compressive load. Buckling load value depends on bearing method and free length of the loaded ball screw shaft.
  • Failure of the nut body or of the bolts that connect it to the slide. This may happen even before the static capacity is reached. Safe loads are discussed on the following pages.
  • Radial loads. It means the load capacities given in this catalogue apply only to pure axial loading. As there are always tolerances in the alignment of bearings and linear guideways, there may be a small amount of radial force, which should be minimized. Under normal conditions, a radial load less than 5% of the minimum axial load will not cause any problems. When considering a ball screw for use under radial load, please consult Steinmeyer engineers.

BUCKLING

There are several analytical ways to demonstrate safety from buckling. In machine design, the most frequently used is a simple calculation using formulas based on Euler equations.

Other, more accurate methods include non-linear FEM analysis and more involved mathematics. These methods are normally used in aerospace applications, where excess safety margins are not possible due to weight limitations. Please contact us if you require such an analysis.

Please CLICK HERE for a simple form of buckling analysis. Buckling

FRACTURE LOAD

Some ball screws cannot be loaded all the way to their static capacity. Screws with high dynamic load capacity (which might be selected to obtain a long enough service life at a much lighter load) will necessarily have a high static capacity. But the term “static capacity” is misleading, since the ball screw may actually fail due to fracture of the nut flange, nut body, or connecting bolts before reaching this load!

Please CLICK HERE for the maximum safe loads. Fracture Load

TECHNICAL TIP

A reasonable load for a ballscrew, which may be sustained for significant travel, is about 10% of its dynamic capacity.

A mean load of 10% of its dynamic capacity results in a theoretical life of 1 billion revolutions, which is the upper limit of the range where the life equation is valid. Mean loads of a reasonably sized ball screw will therefore be somewhat higher than this, but normally not exceed 20% of its dynamic capacity.

For short peak loads, the loading may be higher, but normally the loading of a ball nut with 2-point contact should not exceed 2.8 times the preload. And preload is around 5% – 10% of dynamic capacity.

As a rule of thumb, this all means the load range for a ball screw, to be used in a machine tool application, is really about 10% to 30% of its dynamic capacity. However Steinmeyer ball screws are used in many applications as force actuators where the loading is up to 100% of dynamic capacity but with low speed and acceleration. For example, they may be used to power injection molding machines, where high forces occur at reduced speed. Please consult our engineers for details.

Please CLICK HERE for information on Accounting for preload.

About Steinmeyer

Steinmeyer is the world’s longest continuously-operating manufacturer of commercial ball screws. In the realm of linear motion control, our company has become synonymous with precision, innovation, and exacting standards of quality.

Steinmeyer’s extensive product line is used widely in drive systems for industrial machines as well as precision positioning in optical instruments, medical devices, and other mechatronic applications. www.steinmeyer.com

For further information on Steinmeyer our extensive product portfolio, call 1-781-273-6220 or e-mail Rosmary Belt at rosmary.belt@steinmeyer.com or visit the Steinmeyer FMD group at: www.steinmeyer.com

 

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High Performance Ultra Compact Stepper Motor Positioning Stage From Equipment Solutions!

 

Sunnyvale, CA, – — The motion control SMS12 Linear Stepper Motor stage is an ultra compact stage that provides up to 12 millimeters of linear motion. This stage offers near sub-micron resolution with the ability to accelerate a small load at 2G’s. A non-contact home sensor provides a reference position with repeatability of a couple microns. It was specifically developed for optical applications requiring both high precision and modest-speed positioning over a short to medium stroke. The SMS12 is well suited for optical focusing and other micropositioning applications such as scanning interferometry, surface structure analysis, disk drive testing, autofocus systems, confocal microscopy, bio-technology, semiconductor test equipment.

 

Specifications:

  • Translation 43µm/step
  • 0.67µm @ 64µstep/step
  • Maximum Travel 12mm
  • Maximum Acceleration 2G
  • Maximum Velocity 250mm/sec
  • Maximum Load Capacity 13kg
  • Maximum Moment Load 1.8kg
  • Positioning Accuracy ±2µm
  • Bidirectional Repeatability ±1µm
  • Homing Repeatability ±1µm
  • Motor Amps/Phase 0.3
  • Dimensions 39.1 x 39.1 x 31.75mm

The SMS12 can be ordered with an optional stepper motor controller that is nearly the same size a the SMS12 itself. Only raw power and a simple RS232/RS485 communications line is needed to completely control this high-resolution stage.

SMS-12 Stepper Motor Stage

Equipment Solutions, Inc. (ESI) is a provider of engineering and manufacturing services. ESI specializes in the design and production of automation and instrumentation products including motion control components and sub systems. ESI’s products range from galvanometer amplifiers with an integrated arbitrary waveform generator, to high-resolution displacement sensors, voice coil and stepper motor stages, amplifiers and controllers.

To view and/or down load the Data Sheet CLICK HERE

For additional information contact Jeff Knirck at Equipment Solutions, 1098 West Evelyn Ave. #102, Sunnyvale, CA 94086; Tel: 408-245-7161, Fax: 408-245-7160, E-Mail:info@equipsolutions.com or visit the Website at http://www.equipsolutions.com

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Motion Control – Choose the Right, High Precision, Low Cost Linear Stage to Suit Your Motion Control Application!

OES AQ120 and AQ130 Motorized Linear Stages

 

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Van Nuys, CA – — Motion Control Components – OES (Optimal Engineering Systems) offers ten high precision, low cost linear positioning stages that can be easily integrated into new and existing applications. Choosing the best slide for the application is easy. The five AQ120 and five AQ130 series of linear motorized stages are available in travel distances of: 50 mm (1.969 in.), 100 mm (3.937 in.), 150 mm (5.906 in.), 200 mm (7.874 in.), and 300 mm (11.811 in.). The compact, AQ120 series of linear stages features high precision steel linear ball bearings and hardened steel shafting and are designed for loads of 15 kg (33.1 lbs) for the AQ120-50 to 5 kg (11 lbs) for the AQ120-300. The AQ130 series of linear stages features high precision open steel linear ball bearings and supported hardened steel shafting and is designed for loads to 30 kg (66.1 lbs) for all travel lengths.

Each of these black anodized slides features a large table with a pattern of threaded mounting holes, and a precision low backlash (2µ) 4 mm per turn lead screw. The resolution for all slides is 2 microns per pulse using a10 microsteps per step motor driver, or just 1 micron per pulse using a 20 microsteps per step motor driver.

These stages can easily be configured as XY stages, with a Z axis, or with a rotary, lift, or goniometer stage. All stages are also available with a servo motor and optical encoder, and are compatible with OES’ line of motion controllers. Options also include: plug-in motor driver / indexer, stepper motor with an optical encoder for position verification.

Additionally all stages are available as complete plug-and-play systems.

See also: http://oesincorp.com/motorized-linear-stages/low-cost-series/index.htm

For complete specifications contact an OES engineer or go the OES website at: http://oesincorp.com/motorized-linear-stages/low-cost-series/index.htm.

About OES Optimal Engineering Systems, Inc. (OES) is a manufacturer of motion control products including: Stepper motor controllers and drivers, solenoid electronics, and positioning stages and slides. Applications include: Animation, automated assembly systems, automation, CNC machines, flight simulation, inspection systems, linear and rotary stages, machine tools, medical devices, motion control camera boom systems, optical comparators, CMMs, pan-tilt gimbals, PCB assembly & inspection, pick-and-place, positioning stages, robotics, scanners, security cameras, telescope drive mechanisms, time-lapse photography and winders

Some of the industries OES serves are: Aerospace, Astronomy, Chemical, Communications, Educational Institutes, University, Colleges, Government Agencies, National Labs, Manufacturing, Medical, Metrology, Military, Motion Control, Museum, News Agencies, Semiconductor and Test Equipment. Optimal Engineering Systems, Inc’s. competitive advantage is its state-of-the-art in-house manufacturing facility in North America enabling OES to supply clients with custom designed orders or high volume just-in-time deliveries globally.ve advantage is its state-of-the-art in-house manufacturing facility in North America enabling OES to supply clients with custom designed orders or high volume just-in-time deliveries globally.

For additional information contact Customer Service at Optimal Engineering Systems, Inc. (OES) , 6901 Woodley Ave, Van Nuys, CA 91406; Tel: 888-7071-1826, +1 (818) 222-9200, E-Mail: sales@oesincorp.com or visit the website at http://www.oesincorp.com

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