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Notes on: Guide Elements

FIBRO Precision Sliding Guides –Carbonitrided Sintered Ferrite Bushes

These guides employ bushes made from sintered ferrite of high purity with carbonitridedsurface. Bearing surfaces are fine-ground. The sintered ferrite has a porosity content of 18–20 % by volume, vacuum filled with special lubricant FIBROLIT LD. As additional long term lubrication it is recommended to fill up the grove in the bushing with FIBROLIT LD 280.34 – see page
H 14. Even under arduousrunning conditions, this material can be relied upon for good protection against oil filmrupture. Under no circumstances must molybdenum disulfite be added to the lubricant. For bearing clearance ranges – see page
D 9.

FIBRO Precision Sliding Guide, bronze-coated

consists of a steel body with bronze-coated running surface with helical oil groove and a grease nipple for lubrication. The steel body guarantees excellent resistance to breaking, even when subject to high loading at the edges.

FIBRO Sliding Bearings with Non-Liquid Lubricant

The pockets containing the non-liquid lubricant occupy some 25 to 30 per cent of the bearing surface consisting of a bronze matrix. After an initial oil lubrication on assembly, these elements are maintenance-free.Wherever there is a demand for non-susceptibility against impact, contamination andheat, FIBRO Maintenance-Free Bearings find their ideal application.We recommend to apply the tolerance classes H7/f6 to bush/pillar combinations usingthese elements.

FIBRO Precision Ball Bearing Guides

Careful manufacture at narrowest tolerances, and exactly the right amount of preloading*result in a play-free guide element of exceptional performance potential.Our superfinished running surfaces further enhance the advantages of ball bearing guides. Toolmakers favour ball bearing buides because of their free movement on the bench. FIBRO ball bearing guides have brass ball cages – a material giving optimum results in stability and ball density. Despite their unquestionable reliability at high speeds in particular, ball bearing guides with their point contact of the balls remain somewhat sensitive to shock and sustained radial loads. To some extent, generous dimensioning of pillar diameters helps to compensate for this inherent disadvantage. * Average preloading:4 µm on pillars from 8 to 12 mm diameter7–9 µm on pillars from 15 to 16 mm diameter9–11 µm on pillars from 18 to 42 mm diameter11–13 µm on pillars from 50 to 80 mm diameter

FIBRO-Precisions-Roller Guides

In comparison to ball bearing guides, FIBRO Roller Guide Elements have considerablyhigher capacities for radial loads. The much larger contact area of the rollers permits a significant reduction in preload values. This affords a longer service life of the units.The following preload values apply to FIBRO Roller Guides:For Static Loads/Low Velocities pillar diameters up to Ø 25/32= 2,5µmØ 40–50= 3,5µmØ 30/32= 3,5µmØ 63= 4µmFor Dynamic Loads/High Velocitiespillar diameters up to Ø 25/32= 1,5µmØ 40–50= 2,5µmØ 30/32= 2,5µmØ 63= 3µm
° Use only pairing classguide pillarred=.30guide bush yellow=.10
2·2547·7·2 subject to alterationsD 7