Machinery's Handbook, 31st Edition
V-Block Types
737
Table 3. Accuracy and Dimensions for Type 1, Style 4 Magnetic Clamping V-Block
Permitted Deviations (inch)
Parallelism of “V” to Base and Side 0.0003
Flatness of Working Faces
End/Side Square to Base
Parallelism of opposite faces
Grade
“V” Centrality
Matching tolerance
Grades A, B 0.0001
0.0002
0.0002 0.001
0.0003 0.002
0.0002 0.001
Grade C
0.0004
0.002
0.002
Grade Characteristics
• Up to 2.125” • Mild steel with embedded magnetic core, or laminated mild steel with brass • Surface finish NTE 32 µ in • Material hardness for mild steel 50–62 RC • Up to 2.125” • Mild steel with embedded magnetic core, or laminated mild steel with brass • Surface finish NTE 63 µ in • Material hardness 40–45 RC Steel
Grade A, B
Grade C
Nominal Dimensions
All Grades, Designating Size
Maximum Capacity
Length 1.750 2.375 2.500 3.750
Width 2.375 1.875 2.500 2.375
Height 1.875 1.750 1.750 1.750
1 2 3 4
2.125 1.625 2.250 2.125
All dimensions in inches. Due to the nature of the material, special consideration has been given to the granite V-blocks and the general recommended dimensions are given in Table 4. Higher accuracy granite V-blocks are commercially available and manufacturers’ tolerances apply. Table 4. Accuracy and Dimensions for Type 1, Style 5 Ribbed without Clamps
Permitted Deviations (inch)
Parallelism of “V” to Base and Side 0.0003
Flatness of Working Faces
End/Side Square to Base
Parallelism of Opposite Faces
Grade
“V” Centrality
Matching Tolerance
Grades A, B 0.0001
0.0002 0.002
0.0002 0.001
0.0003 0.002
0.0002 0.001
Grade C
0.0004
0.002
Grade Characteristics
• Up to 10.500” • Mild Steel or close grained cast steel free from porosity and defects • Surface finish NTE 63 µ in • Material hardness 40–45 RC steel • Up to 10.500” • Mild Steel or close grained cast steel free from porosity and defects • Surface finish NTE 63 µ in • Material hardness 40–45 RC steel
Grades A, B
Grade C
Nominal Dimensions (inch)
All Grades, Designating Size
Maximum Capacity
Length 2.250 3.500 5.000 8.000 10.000 12.000
Width 4.000 4.000 6.000 8.000 10.000 12.000
Height 4.000 4.000 6.000 8.000 10.000 12.000
1 2 3 4 5 6
3.000 3.000 4.875 6.500 8.500 10.500
All dimensions in inches.
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