Page 283 - Modular design for machine tools

242 Engineering Design for Machine Tool Joints

6. The rate of loading has an effect on the microslip, resulting in the
reduction of the tangential joint stiffness. According to the results of
Kirsanova, the tangential stiffness reduces 20% when the rate of
loading increases 2.5 times.
To this end, Fig. 6-19 shows the test rig used by Boothroyed and cowork-
ers. This test rig can be characterized by its smart ideas as follows.

Interface Center of mass of lid
Push rod to shaker
Lid
Force transducer Cup
Displacement probe Table

Preload
Cup and lid assembly
Displacement
probe
Lid Cup Table
Ball bearing

Dead weight

Water Fulcrum

Dead weight
To reservoir
Setup for dynamic loading
Figure 6-19 Test rig for dynamic tangential behavior of flat
joint (courtesy of Boothroyd).