Chapter 6 Layout Work 107
SUMMARY
Layout work plays an essential role in many
areas of metalworking. It is very important to
understand how layout and measuring tools are
used to produce a simple layout. Making an
accurate layout requires careful study of the print,
the development of a sequence of operations, and
the precise placement of lines and marks.
A properly developed layout provides the
locations necessary to machine the work. It helps
ensure the job is completed correctly and accurately.
TEST YOUR KNOWLEDGE
Please do not write in this text. Write your
answers on a separate sheet of paper.
1. Define the process known as layout.
2. Layout lines are used to _____.
(a) take the place of blueprints
(b) tell the machinist where to machine
(c) give the machinist practice in measuring
(d) None of the above.
3. Layout _____ is used on metal to make
layout lines more visible.
4. What is a scriber?
5. A _____ is used to draw circles and arcs on
metal.
(a) hermaphrodite caliper
(b) divider
(c) spindle
(d) None of the above.
6. What are the three major parts of a surface
gage?
7. What is the difference between a hardened
steel square and a double square?
8. A combination set cannot be used to _____.
(a) draw angular lines
(b) measure depths
(c) draw circles and arcs
(d) level angular surfaces
9. The _____ of the combination set can be used
to quickly locate the center of round stock.
10. A _____ is used for jobs requiring extreme
angular accuracy.
(a) protractor depth gage
(b) Vernier protractor
(c) plain protractor
(d) spirit level
11. What is a surface plate?
12. _____ are frequently used to support round
stock for layout and inspection.
(a) V-blocks
(b) Box parallels
(c) Right angle plates
(d) Trammels
13. Straightedges are made from _____ or _____
and are available in a wide range of sizes.
14. What are reference lines?
15. A(n) _____ punch is used to mark the points
where centerlines intersect on a layout. A(n)
_____ punch is used to enlarge the points
identifying the center marks.
RESEARCH AND DEVELOPMENT
1. Write a report on how surface plates are
made. Why are they made of cast iron and
granite, and not other materials?
2. Prepare several overhead transparencies
showing the proper sequence for making a
layout. Make a tape recording of your
presentation to the class.
3. Develop a display illustrating several
different types of layout dyes used on stock.
Protect your samples with clear plastic
spray to prevent the scribed lines from
rusting.
Prick punch
Center punch
A
B
Figure 6-30.
A prick punch and center punch. A—The prick
punch has a more sharply angled point than a center
punch. It is used to mark the intersections of
centerlines. B—After checking for accuracy, marks
for the locations are enlarged with a center punch.