Designed for testing of heavy loads and voluminous objects in X and Y directions, the low pressure bearings are located to restrain pitch and roll moments. The slip table works on the principle of an oil film maintained between granite surface and slip plate supported by grid array bearings to eliminate overturning moments.
An oil film is automatically created through a closed loop system, when the oil pump coupled with the motor is started. Adequate oil supply is provided for table breakaway friction under heavy specimen loads. The oil supply is adjustable for various table loads and returns to the reservoir through flexible pipe under gravity. The amount of oil is indicated on the level indicator, generally to be replaced after every 500 hours of usage.
The discharge of hydraulic unit is supplied to two separate manifolds for supplying oil to bearings and for formation of film on the granite block. Pressure gauges are provided for each manifold. The slip plate platform is precisionsurfaced with integral object mounting facility through replaceable SS inserts. The slip table is finished with glossy and metallic coatings of the latest polyurethane paints with attractive colors.
High pressure hydrostatic bearings incorporate and oil film slip table to provide a highly damped horizontal slip surface. The basic system includes a drive magnesium slip plate with perimeter extensions that covers the oil recovery moat. This design protects the operator from exposure to the hydraulic oil while keeping fingers and clothing from accidental contact with moving components.Special attention is given to operator safety.
Complete system comes with a precision ground natural granite slip surface extra large internal oil reservoir, adjustable trunion mounting blocks, and oversized magnesium slip plates. It is designed to mount the entire shaker assembly including the shaker’s standard support base, directly to a common steel. The common platform also supports standard standalone slip table assemblies. So it allows the customers to incorporate their existing
shakers inhouse. Only the highest quality materials and components are used to produce the slip tables.
T-film hydrostatic
This is a unique combination of standard oil film slip plate guided by multiple inverted ‘T’ shaped bearings and support elements (The patented design of TEAM Corporation, USA). The table has exceptionally high overturning moment capacity and stiffness. Photographs shown present the bearing layout and guidance.
T-film Bearings
These are squared blocks with an inverted ‘T’ moving element designed specifically for guiding the slip plate during vibration testing.
Some of the bearings have single degree of motion, some have degrees of freedom. A typical table is made up of single row of one type of bearings and the remaining two rows of oil film elements to allow for thermal contraction and expansion.
Slip Plate
This is a precision-grinded tool grade magnesium alloy plate. Depending upon application the thickness of slip plate varies from 38 mm to 75 mm. SS inserts are provided on the plate as per user’s grid requirement.
Pressure Connectors
Oil flows through rows of bearings by using pressure connectors. The important feature of Pressure connector is its ability to seal against high pressure in case of mis-alignment. Using Pressure connector between the bearing allows the bearings to be butted to one another with minimum open spaces.
Hydraulic Supply
The power supply is adequate for various grid of bearing elements. The normal power supply is a half HP single-phase pump-motor. For tables larger than 25 bearings there may be multiple units like this power supply, placed below the oil level of the moat to assure correct gravity of drain.
Drive End
The slip plate is offered with the standard drive end connection however other custom built drive ends can be supplied to accommodate technical considerations of the customer.
Oil Type and Viscosity
The oil used in the table is generally a standard hydraulic fluid. The ‘O’ rings used in these tables are compatible with any petroleum based standard hydraulic oil. The important factor for operation of this table is viscosity of the oil. The viscosity of most hydraulic fluids varies considerably with temperature. Since the normal operating temperature of the table will not usually be more than a few degrees above the lab temperature, the viscosity should remain fairly constant. The flow rate in the bearing is inversely proportional to oil viscosity. In most cases, the viscosity varies considerably with temperature. Therefore, when operating at higher temperatures it may be necessary to use a larger supply or heavier viscosity oil, or both.