OfiTE 112-00 - Description of Tests; Lubricity (Surface to Surface Drag) Test; EP (Extreme Pressure) Test

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Lubricity (Surface to Surface Drag) Test
The more common lubricity test measures uid resistance of various
lubricating additives. The standard lubricity coefcient test is run at 60 rpm
with 150 in-lb of force (the equivalent of approximately 600 psi (4,137 kPa)
pressure of the intermediate uid) is applied to two hardened steel surfaces,
a rotating ring and a stationary block.
Friction is measured as the coefcient of friction (μ). The coefcient of friction
between two solids is dened as the frictional force of the load or the force
perpendicular to the surfaces. The coefcient of friction is independent of
the apparent areas of contact as long as this area is not so small as to break
through the lm. The force to overcome friction will be the same for a small
area as for a larger area. The force, F, required to slide the block and the ring
surfaces across each other at a given rate is measured by the power required
to turn the test ring shaft at a prescribed rate of revolutions per minute.
The Coefcient of Friction, μ =
EP (Extreme Pressure) Test
This test produces an indication of the lm strength of the uid being tested
by applying a measured force to a torque-sensitive bearing cup with the
torque arm. The EP test is typically run at a high shear rate (1,000 rpm) with
uid pressures ranging from 30,000 to 100,000 psi (206,820 - 689,400 kPa)
between the steel surfaces. Increasing pressure in in-lb of force is applied
until a seizure or pass is obtained.
Digital Control
- The digital control panel provides more accurate data than older analog
models.
- The rotational speed (rpm) is automatically maintained as the torque is
increased, resulting in more accurate data collection and is less labor
intensive for the technician.
User-Friendly Interface
- The simple, intuitive interface makes testing quick and easy.
Functions include:
- Pre-Set Speeds: 60, 200, 600, and 1000 rpm
- Manual Speed Control
- Zeroing Torque and Time
- Maximum Speed: 1,000 rpm
- Maximum Torque: 600 in-lb
- Belt-Driven Motor: ½ HP, 90 Volt DC, 5.5 Amps
- Size: 19" × 15" × 14" (48.3 × 38.1 × 35.6 cm)
- Weight: 56 lb (25.4 kg)
Description
Meter Reading
Load or Force
Features