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14
Ex.: 1)
Use the stopwatch to measure the time required to
complete one job.
If it takes 20 seconds, the stopwatch second hand
indicates “180” on the tachymeter scale. This means that
180 jobs will be accomplished in one hour.
The tachymeter is extremely useful in calculating factory operation efficiency or
machine products amount.
Tachymeter scale
figure at 20 seconds
position
x 1 job
180
(2) To measure the hourly rate of operation
= 180 jobs
Ex.: 2)
Use the stopwatch to determine how many jobs are accomplished in a specific period
of time.
If 15 jobs are completed in 20 seconds, multiply “180”, the figure on the tachymeter
scale indicated by the stopwatch second hand, by 15. Thus, it is estimated that 2,700
jobs will be accomplished in one hour.
Tachymeter scale
figure at 20 seconds
position
x 15 jobs
180
= 2,700 jobs per hour
