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Specific Maintenance Procedures and Requirements
Published in Ryan Cruzan, Manager’s Guide to Preventive Building Maintenance, 2020
Each valve in your building should have a unique valve number attached to it with a piece of wire or ball chain. A “valve chart” listing each valve, its location, and its function will be very helpful when trying to shut off water in an emergency. I recommend creating such a valve chart and adding a valve number tag to each valve when doing your building inventory. Without a valve chart, it’s unlikely that your PM tech will find all of the valves in your building. A set of plumbing system blueprints will help you in creating a valve chart.
Modeling of Friction Forces for Linear Motion Ball Guides Considering Variation of the Friction Parameter with Operating Condition
Published in Tribology Transactions, 2022
Xiao-Yi Wang, Hu-Tian Feng, Hua-Xi Zhou, Chang-Guang Zhou, Zeng-Tao Chen
The detailed specifications of the tested LMBG are listed in Table 1, and the tested LMBG is without a ball chain. Table 2 shows the experimental conditions. To maintain a good lubrication condition, before the friction experiments started, the oil (Mobil VG 100) was manually applied to the test carriage and then the test carriage moved reciprocally along the rail 10 times at a speed of 0.6 m/min to ensure that the balls were fully lubricated. Therefore, the tested LMBG was considered in a good lubrication condition throughout the friction experiments. Under each operating condition, the tested LMBG reciprocated two times. The friction force generated from the tested LMBG was measured in both the forward and backward directions. The average value of four tests was taken as the result of each friction measurement. To reduce the slope error and parallelism error, the effective motion stroke of the test sample was set as 60% of the rail length for each test.