The ballscrew is the motion transmission unit of machine tools and several machinery structures, transforming the rotational motion into linear motion with a high rate of efficiency, ensuring in addition high accuracy, loadability, rigidity7 and durability. The selection, implementation and utilisation of the appropriate alternative of type, capacity and size requires careful consideration. The preparation of fabrication plans may be based on client drawing, sketching and design data or the provided sample. The short information below is listing only the main design criteria. Our staff will be pleased to provide more detailed information to our clients.
Cylindrical nut with wipers
Preloaded duble nuts with wipers
Flange-type single nut
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|General characteristics of the Szimikron ballscrews|
|Execution, standard: according to DIN 69051|
|Accuracy rates: 3, 5, 7 / DIN 69051|
|Standard lead direction: right
|Material(according to DIN):
spindle: 100Cr6, inductively hardened
nut: BC3, case-hardened
|Thread surfaces: hardened, ground, HR 60± 2|
thread profile: gothic
ball return: internal, by threads
preload: mechanically adjustable or glued
|Design criteria for defining dimensions and main technical characteristics:|
|- load, r.p.m.|
|- accuracy rate|
|- limit of rotation|
|- critical rotation|
|- resistance to lateral bending|
Installation of the ballscrews
The ball screws require precise and rigid installation. Both the tolerance of parallelism between the spindle and the slide, and the tolerance of perpendicularity of the nut installation has to be observed and kept within the minimal values.
Lubrication of the ballscrews
The lubricants being used for the lubrication of the ballscrews are basically the same as those used for roller bearings, just the quantity used is higher. The lubricating material can be oil or grease. In case of oil lubrication, a higher rotation can be allowed than in case of grease lubrication, as the heating of the spindles is lower. In case of grease lubrication, a regular re-lubrication period of 6 months is sufficient after the initial operation cycle.
Design of shaft ends
The shaping of shaft ends is based on the client's drawings. For the specification of shape and position tolerances being appropriate for the given accuracy class, the provisions of standard DIN 69051 are to be followed.
E.g.: the designation of a IT 3 accuracy class ball- screw with a nominal diameter of 40 mm, a right direction thread elevation of 20 mm, mounted with a ball of 7,144 mm diameter, with a threaded length of 1040 mm and total length of 1280 mm, with 4-4 operating threaded flange-cylindrical nut pairs, with wiper at both ends is:
40.20R. 7,144. 1040/1280 (AFV-AZV)/4-T3
Should the demand for products be different from those listed on the following pages, we are ready to help our partners by:
(e.g. nut pairs being installed into the housing)
d0 = 6, 8, 10, 12, 16 P = 1, 2, 2,5, 3, 4 etc.
We also undertake the repair works of ballscrews,