FAFNIR SUPERPRECISION BEARINGS
Superprecision MM (ABEC-7, ISO P4)
Superprecision bearings of the K or non-filling slot con- struction are generally used on woodworking spindles, aircraft accessory units and machine tool applications where duplex bearings are not a definite requirement. By virtue of the single row radial deep groove construction and superprecision tolerances, they are capable of carrying thrust loads in either direction and have relatively high- speed ability.
More popular on precision machine tool spindle applica- tions are the WI angular-contact type bearing variations, namely 2MM-WI and 3MM-WI. Since this bearing type has a low shoulder on outer ring, it carries thrust in one direction.
Fafnir's MM Superprecision bearings are finished to MMV tolerances – as standard procedure.
Super High Precision MMV (HG)
Superprecision bearings are manufactured to our new HG tolerance class, with running accuracy and performance meeting ABEC-9 (ISO P2) while maintaining noncritical features at ABEC-7 (ISO P4) level for cost-effectiveness. Bore and O.D. surfaces are coded in micron units for the convenience of the discriminating machine tool builder who is striving for optimum fitting of all spindle components.
The recent development of ceramic rolling elements in high performance bearings offers the customer the ultimate of speed capability, high stiffness, long life, low heat generation, and overall system reliability. The 99100 series is available with the option of ceramic ball selection.
Ultraprecision MMX (ABEC-9, ISO P2)
Superprecision bearings with closer tolerances and running accuracies than ABEC-7 (ISO P4) bearings are made to ABEC-9 (ISO P2) tolerances. Bearings produced to these tolerances are generally made as WO and WN construc- tion, and are use on ultra-high speed grinding spindles designed for tight dimensional tolerances and super-fine surface finishes. Consult our Engineering Department for availability.