Page 286 - Modular design for machine tools

Engineering Design Fundamentals and Single Flat Joint Characteristics 245

Clean surface

0.5

0.4
Surfaces flooded with
0.3
a saturated solution of lauric
0.2 Polished platinum acid in cetane as a lubricant
Tangential force ratio m t 0.5 0 5 10 15 20 25
0.1

0.4
0.3
Steel
0.2 Scale line indicating 1/40 of
calculated diameter of contact area
0.1 under normal loading
(Normal load: 920 gwt)
0 1 2 3
Displacement d , mm
s
Figure 6-21 Original data for displacement dependence of tangential
force ratio (by Courtney-Pratt and Eisner).

Elastic portions of displacement Amplifier

B cr
300 Y X
C 3 X-Y plotter
Friction force, GMF 150 C 1 A L Microslip Pulley DC Amplifier
C 2
Strain ring
Movable surface

Fixed surface
Displacement
0 10 20 30 80 90 100 sensor
Displacement, min Water inlet 50 gr/min
Figure 6-22 Microslips and stick-slip-like movement prior to start of macrosliding (by Simkins).