What is the basic dynamic load rating?
Basic load rating is a bearing term that means "a load of a certain direction and magnitude that can be applied to a bearing to obtain a rated life of 1 million revolutions." Rated life is "the total number of revolutions that 90% of a group of identical bearings can rotate without suffering material damage due to rolling fatigue when operated under the same conditions."
To explain it in terms of Ball Screws, the basic dynamic load rating is the axial load at which 90% of a group of identical Ball Screws can rotate without "flaking" for a lifespan of 1 million revolutions.
This explanation alone may seem like a good idea, but it is not, so let's explain it in more detail.
For example, the catalog states that the basic dynamic load rating of a ball screw with a shaft diameter of 15, lead of 10, number of revolutions of 1.5 turns, single row, and single nut is 4400N. This means that if 100 Ball Screws are operated with an axial load of 4400N, more than 90 of them will last up to 1 million revolutions without breaking.
(1 million revolutions is equivalent to 500 hours when rotated at 33.3 min-1
, for example.) In other words, the basic dynamic load rating is the basis for calculating the lifespan of each size of ball screw.
The basic dynamic load rating will be the same regardless of whether the nut type is a single nut, integral nut, or double nut, as long as the shaft diameter, lead, number of revolutions, and ball diameter are the same.
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