This is a problem that is exhibited by all inclinometer probes. The wheels of the probe, which travel in the ‘A’ grooves, are slightly narrower than the grooves in the casing. That means the wheels have some freedom to move from side to side within the grooves. The A axis of the probe is in-line with the wheels, so it is not affected by side to side movement of the wheels. Also, the spring loading of the wheels prevents any ‘wobbling’ in the A axis. The B axis of the probe is directly affected by side to side movements, which appear as small changes in inclination. Why don’t we make the wheels fit the grooves perfectly? If the wheels fit perfectly, the probe would be forced out of the grooves when the casing deformed, and then repeatability would be very bad. Slope Indicator is working on another solution to this problem, which we will announce in a few months.
July 30, 2024