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Cook, George H. (ed.) / The Wisconsin engineer
Volume 40, Number 3 (December, 1935)

Jorgensen, Allen
Ford Motors adopt new measuring system,   pp. 58-59


Page 59


  6  8 £     9   P   C e    I
C
  6
2
    9                                10
          1 2 3 4 5 6 7 8 91
             New Type of Scale Division
gauging with the eye an equal distance between marks.
Having its smallest graduation at 1/50th of an inch facili-
tates quicker and more accurate reading. Although cali-
brated in fiftieths of an inch, all figures are read in hun-
dredths, such as 20, 40, 60, 100. Another simplicity fea-
ture of the system lies in the fact that all dimensions where
accuracy of a tenth is needed are expressed with one digit.
As the accuracy increases to 1/100 or 1/1000 another
digit, or two, is the only addition needed. With such small
number-of-digit figures it is possible to keep a drawing
from getting cluttered up with lengthy figures.
  The Ford company finds the advantages from using the
decimal system to be even more pronounced when deter-
mining dimensions through the use of trigonometrical
functions, where the sines, cosines, tangents, etc., of angles
must be multiplied or divided by the three or six place
decimal equivalents of common fractions to obtain the de-
sired result. In this system it is usual to have but one or
two digits which must be multiplied by the trigonometri-
cal function, thus materially reducing the time required
and the chance of errors in calculations of this type."*
  So long as standard tools, dies, etc., are made according
to the old system it shall be necessary to conform on some
parts to the old system. However, the transition is slowly
taking place, and it is today the confident dream of Ford
engineers that the Ford plant will soon be completely free
from the tentacles of a time consuming measuring system.
*Abrasive Industry, June 1935.
December, 1935
Christmas
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Page 59


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