1. BRX210 ‘Mechanical Blueprint Reading’
Unit #6
Holes

2. After studying this unit, you will be able to:
Define the terms drilling, reaming, countersinking, counterboring, spotfacing, and boring
Identify and list the location and size of drilled, reamed, countersunk, counterbored, spotfaced, and bored holes

11. Answers to Valve Cap Quiz
0.170 in.
316 SST
0.095 in.
0.345 in.
0.025 in.
5:1
± in
0.176 in.
0.005 in.
0.095 in
0.032/0.028
± ½ º
0.038/0.042
Ø 0.095/0.093
0.022/0.018 5
0.037/0.033 VC
Critical Dimensions for Statistical Process Control No

13. Answers to Eccentric Collar Quiz
1.178 in.
0.688 in.
2.548/2.538
2.538 in.
0.813/0.812
0.239 in.
1-1/4 in.
1.105 in.
2.548/2.538 length was 2.545/2.540
Reamed
0.673 in.
4 (see note)
0.1595/0.1695
0.344 in.
Full
in.
3 ga. Hot Rolled, Pickled and Oiled Sheet Steel
0.001 in.
0.390 in.
1.260 in.

15. Answers to Shoe Plate Quiz
9-1/8 in.
9.135 in.
0.090 in.
13/16 in.
in.
½ in. 4
in.
2 in.
7/16 in.
in.
1.5495/1.5535
0.634/0.638
4 in.
0.007/0.012
0.01 in. 12
1.093 in.
0.3928/0.3938