Axial-radial precision roller bearings

RTB bear­ings are also avail­able with an in­te­grated angle mea­sure­ment sys­tem (RTB-​AMS), in par­tic­u­lar for the use in torque-​driven ro­tary ta­bles.

The angle mea­sure­ment sys­tem con­sists of a cir­cu­lar pre­ci­sion scale (in the form of a mea­sure­ment ring), which is mounted on the outer di­am­e­ter of the axial disc. De­pend­ing on the re­quired ac­cu­racy, one or two scan­ning heads are po­si­tioned on the bear­ing outer ring and aligned with the pre­ci­sion scale. They de­tect the ro­ta­tion angle of the scale grid and thereby gen­er­ate an out­put sig­nal for the CNC con­troller of the ma­chine tool. The out­put sig­nals cor­re­spond to the com­mer­cial stan­dard.

Thanks to the in­duc­tive mea­sur­ing method, these bear­ings are ro­bust, ther­mally sta­ble and easy to mount. Fur­ther­more, the sys­tem is con­structed mod­u­larly, so that it meets all re­quire­ments re­gard­ing res­o­lu­tion and pre­ci­sion.

An­other se­ries from the range pro­vided by Ro­driguez are the RTB bear­ings of the RTB-​ABS se­ries with in­te­grated ab­solute en­coder, which en­ables an ab­solute po­si­tion record­ing in real time with a res­o­lu­tion of up to 25 bit.

The so­lu­tions of this se­ries are equipped with a scan­ning head with in­te­grated elec­tron­ics and they are avail­able with an in­side di­am­e­ter of 200 to 580 mm. Dri­vers for the in­ter­faces CLiQ, SSI, BiSS/C and Fanuc (EnDat 2.2, Mit­subishi under de­vel­op­ment) are avail­able.