ENTC 1110 Traditional Tools Traditional Tools Traditional tools are devices used to assist in improving the quality and efficiency of technical drawings. The assistance includes: drawing straight lines straighter, making circles more circular, and increasing productivity
Adjust the scale so that the other end of the line is aligned with the smaller of the two foot mark values, which for this example is 3.
To determine how many parts a foot has been divided into
count the number of
For the example, there are 24 marks to the left of the zero mark.
Each mark equals 1/2”.
The longer marks represent inches.
For this example, the closest mark is the 8
The line is measured as 3’ 4”.
CIVIL ENGINEER’S SCALE
twenty marks per inch.
each mark equals 1/20”
Align the zero mark on the 20 scale with the left end of the line to be measured.
Determine the closest mark on the 20 scale that corresponds to the right end of the line.
For a full-scale drawing
the line is 24/20 or 1.2”
the line is 2.4”
For 1” equals 20’ (1” = 20’)
the line is 24’.
MECHANICAL ENGINEER’S SCALE
Problem 3.3 #a, b, & c
Problems 3.5a #1, 2, & 3
3.6a #1, 2, & 3
3.7a #1, 2, & 3