MIL-HDBK-1897(AT)
w |
x |
y |
z |
Parallelism tolerance |
0.375 0.500 0.625 0.875 1.000 1.250 1.375 1.500 |
0.250 0.500 0.750 1.000 1.250 1.500 2.000 2.500 |
0.125 0.250 0.375 0.500 0.625 0.750 0.875 1.000 |
0.500 0.750 1.000 1.250 1.500 1.750 2.000 2.250 |
+ 0.003 + 0.005 + 0.005 + 0.008 + 0.008 + 0.010 + 0.010 + 0.015 |
FIGURE 17. Hole parallelism tolerances for investment castings - Continued.
5.1.12 Keyways. Tolerances for investment cast keyways are shown in figure 18.
x |
Tolerance for x |
y |
Tolerance for y |
0.031 0.046 0.062 0.125 0.250 |
+ 0.003 + 0.003 + 0.003 + 0.003 + 0.003 |
0.500 0.750 1.000 1.500 2.000 |
+ 0.005 + 0.005 + 0.005 + 0.008 + 0.010 |
FIGURE 18. Keyway tolerances for investment castings.
5.1.13 Keyslots. Recommended for non-ferrous alloys only. A key slot can be cast in ferrous alloys, but no "rule of thumb" applies. when a closer tolerance is required, broaching stock
and/or ream stock is allowed or keyslot is omitted entirely. For recommended tolerances see figure 19.
17
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