Roton Products Inc.
Contact: sales Manager
660 E Elliott
Kirkwwod, MO 63122
U.S.
Phone: 800-467-6866 Intl
Fax: 314-821-4818
General Information
Advantages and Features
Materials and Processes
Non Self-locking
Mounting Ballnuts
Typical Applications
Advantages and Features back to top
Roton's rolled thread Ballscrews and high performance Ballnuts replace the sliding friction of Acme, Hilead®, and Torqspline® leadscrews with the rolling friction of ball bearings placed between the screw and nut members. This construction results in very high mechanical efficiency and much less energy consumption for a given load. Thus smaller motors and other drive components can be used with Ballscrews. As Figure 1 and Figure 2 demonstrate, the same torque applied to a conventional screw moving load "x" will move 3 times the load, "3x", when applied to a Ballscrew. Duty cycles can be more severe as less heat builds up in Ballscrew drive systems when compared to conventional screw drives. Predictable wear life and smooth, quiet operation are also obtained.
Materials and Processes back to top
All Ballscrews are roll formed of quality high carbon or alloy steel. Screws are induction case hardened for maximum load and service life. Nuts are made from carburizing grades of carbon or alloy steel and case hardened for wear resistance. High grade, bearing quality chrome steel balls are utilized. Return circuitry is secured with alloy capscrews for maximum reliability.
Non Self-locking back to top
High mechanical efficiency renders all Ballscrews non self-locking. This means that Ballscrews can convert thrust loads into torque loads. If a Ballscrew is used to support a load against gravity, a rotational brake will be needed to prevent the load from rotating the screw and lowering the load.
Because they are non self-locking, Ballscrews are often used to convert thrust to torque. An input linear thrust on the nut (or screw) will produce an output torque on the screw (or nut). This action (thrust conversion) is called backdriving. Thrust conversion is not possible with Acme series screws although some Hilead¨ and all Torqspline® series screws will also backdrive. When applications require thrust conversion, the lead selected should be a minimum of 1/2 the Ball Circle Diameter (BCD) for reliable operation. Small leads have less mechanical advantage for backdriving.
Mounting Ballnuts back to top
Ballnuts are typically mounted in mating flanges as shown in Figure 2. Many other arrangements are possible. Any method that restrains the nut from rotation and translation will suffice. Machining into the nut's outside surfaces should be avoided as the ball circuits may be damaged.
Care should be taken to keep the loads as axial as possible. If significant side loads are present, support rails should be used in parallel with the Ballscrew so that the Ballscrew undergoes axial loading only.
Mounting for tension loads is always preferable as column loading problems are eliminated. See Figure 29 for information and limits on column loading. The longer the Ballscrew and the smaller the Ballscrew diameter, the greater the possibility of column loading limitations.
Custom nuts machined for easy mounting in OEM equipment are quite popular and favored by large volume users. Contact Roton Application Engineering for your custom nut requirements.
Typical Applications back to top
High efficiency, accurate positioning, and smooth, quiet operation at low friction make Ballscrews ideal for use in a wide variety of equipment in many industries. Predictable service life and reliability make Roton's Ballscrews ideal for use in:
hospital beds
medical examination equipment
servo drives
log splitters
dish antenna drives
door actuators
scanners and test equipment
plotters
robotics
web tensioners
automatic pilots
trim tab drives
back gage positioners
fork lift remote accessory drive
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