Hollow Rotary Tables

Passing something through the axis of rotation — cabling, a shaft, a vacuum or air line, a laser path, or an optical train — without it winding up as the table turns. That through bore is the whole reason to choose this over a solid rotary stage, and it is why these are also sold as hollow rotary actuators or through-hole rotary tables.

Because they differ by about an order of magnitude and printing both in the same unit hides that. Indexing accuracy — how close the table gets to a commanded position — is published here as ± 0.5 arc-min. Repeatability, how closely it returns to a position it has already reached, is ± 5 arc-sec. Sixty arc-seconds make an arc-minute, so the two figures are not interchangeable.

How far off-centre, and how heavy, a load can be before the bearing is overloaded — published per model in newton-metres, from 137 to 2500 across the series. A light part on a long arm can exceed it while a heavy part mounted close to the axis does not, so it is the figure to check for anything that does not sit over the centre.