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Pivot Friction Apparatus (SMT-MM-30)
Demonstrates the relationship between friction torque and
axial thrust; determines the influence of bearing cone
The wall mounted apparatus consists of a rotating circular
table on a vertical shaft, with a variety of interchangeable
end pivots and seatings.
The apparatus consists of a rotating circular turntable attached onto the end of a vertical
shaft. The shaft is held vertical within a sturdy wall bracket that must be attached to a rigid
vertical surface, i.e. a wall. At the lower tip of the shaft a special fixing has been created to
accept a variety of end pivots. Mating seatings have been manufactured for the end pivots.
The seatings positively locate at the bottom of the wall bracket so that they mate with their
respective seatings but do not rotate under testing. The seatings are made from different
materials and with different internal cone angles. Pure torsion is applied to the table through
a pair of diametrically opposite loaded cords and pulleys. A set of calibrated weights and the
hangers are supplied.
To vary the thrust on the end pivot, the calibrated weights are added incrementally to the
turntable surface. Weights are then added to the load hangers to calculate the necessary