Calculation and Fitting of NYLONIT-bearings
The following calculation-method is to be considered only as a guideline, since many unpredictable factors may require changes.
P = Surface Pressure in N/cm2
V = Periferal Speed in m/min.
P x V should not be higher than:
500 when the bearing is 100% dry.
1000 when the bearing is greased at fitting.
2000 when the bearing is greased regularly.
5000 when the bearing is greased automatically or submerged in the lubricant.
This rule is valid for V > 25 m/min. If V < 25 m/min., a higher Surface Pressure P is permitted.
Surface Pressure P max. = 550, when V = 0, at +20C.
Friction-coefficient NYLONIT on steel: (m = m = coefficient of friction)
Dry: m = 0,11
Water-lubricated: m = 0,06
Oil-lubricated: m = 0,01
Max. Operational Temperature: + 65C (Should you require higher temperature-resistance, please contact us.)
Slide Bearing without Collar, ID X OD X L = 10 x 12 x 12 mm
Load = 30 N ; Surface: 10 x 12 mm = 120 mm2 = 1,2 cm2
P = 30/1,2 = 25 N/cm2
At 500 revolutions/min.: V = 10 x p x 500 = 15.700 mm/min. = 15,7 m/min.
P X V = 25 x 15,7 = 392,5
When the NYLONIT bearing is pressed into a countersunk hole with H7 tolerance it provides a bearing clearing for a shaft with h7 tolerance of 0,5 – 1,0% of the shaft-diameter. If a smaller bearing-clearance is required, i.e. at low loads and rotation-speed, this is achieved by pressing the bearing-bushing into a corresponding smaller hole.
Please note: The tolerance is in the bearing-clearance (wall-thickness). Our dimensions are stated respectively for shaft-diameter and bearing-house-diameter and can therefore not be used as control-dimensions before the bearing has been fitted.
BEAR IN MIND: ONE DROP OF OIL WHEN FITTING MEANS LONGER LIFETIME AND LOWER FRICTION !