2 (page 151).
In this case, instead of observing, first, the "time to fill a shovel,"
and then the time to "throw it into a wheelbarrow," etc., a number of
these more rudimentary operations are grouped into the single operation
of
a = "Time filling a wheelbarrow with any material."
This group of operations is thus studied as a whole.
Another illustration of the degree of subdivision which is desirable
will be found by referring to the inserts, Fig. 5 (opposite page 166).
Where a general study is being made of the time required to do all kinds
of hand work connected with and using machine tools, the items printed
in detail should be timed singly.
When some special job, not to be repeated many times, is to be studied,
then several elementary items can be grouped together and studied as a
whole, in such groups for example as:
(a) Getting job ready to set.
(b) Setting work.
(c) Setting tool.
(d) Extra hand work.
(e) Removing work.
And in some cases even these groups can be further condensed.
An illustration of the time units which it is desirable to sum up and
properly record and index for a certain kind of lathe work is given in
Fig. 6.
SIGNED TOTAL FIGURE 6. -INSTRUCTION CARD FOR LATHE WORK (not shown)
The writer has found that when some jobs are divided into their proper
elements, certain of these elementary operations are so very small in
time that it is difficult, if not impossible, to obtain accurate
readings on the watch.
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