Construction of Ball Screws
Return-plate system
The Return-plate system uses coil-type deflectors incorporated inside the Nut to pick up the steel Balls and circulation them via the Return-plate channel. This system has the advantage of allowing the use of a Nut that is smaller in diameter than those employed in Return-tube systems. In addition, the upward-angle installation of the Return-plate ensures even smoother rotation.
Internal-deflector system
The internal-deflector system employs a lightweigth Miniature Ball Screw, which enables the Nut diameter and length to be reduced to the smallest possible size. The Balls bear the load while rolling along the screw groove between the Shaft and the Nut. The Balls are continuously calculated, transferred to the adjacent groove in the screw via the Internal-deflector channel and then back to the loaded groove area.
End-cap system
The End-cap system is recirculating system in which the Balls advance by rolling through the screw groove between the Nut and the Screw Shaft. The Balls are then returned via the holes in the Nut and the channels in the reicrculating sections of the End-caps on either end of the Nut.
End-deflector system
The Balls are circulated from End-deflector incorporated inside the Nut or outside the Nut through the hole in the Nut and the channels in the recirculating sections. Ball Nut diameter can be smaller than Return-plate system. This is suitable for the middle lead Ball Screws.
Return-tube system
In the Return-tube system, Balls rolling between the Nut and the Shaft are picked up from the screw groove by the end of the Return-tube built into the Nut. Then, they flow back through the Return-tube to the screw groove.
Thread Groove profile
Ball Screw may have either a circular arc profile, formed of a single arc, or a gothic arc profile, formed from two arcs. SCREWTECH Ball Screws feature a gothic arc profile.
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