Machinery's Handbook, 31st Edition
V-Block Types
739
Type II, Style 1 Double Groove Examples
Fig. 7a. Double Groove Single Level Clamping
Fig. 7b. Double Groove Double Level Clamping
Fig. 7c. Double Groove Single Level Clamping
Table 6. Type II, Style 1 Double Groove Single Level Clamping
Permitted Deviations (inch)
Flatness of Working Faces
End/Side Square to Base 0.0002
Parallelism of Opposite Faces
Parallelism of “V” to Base and Side
Grade
“V” Centrality
Matching Tolerance
Grade A 0.0001 Grade B 0.0004
0.0002 0.001
0.0003 0.002
0.0003 0.002
0.0002 0.001
0.002
Grade Characteristics
• Steel alloy • Surface finish NTE 32 µ in • Material hardness 50–62 RC
Grade A
• Mild steel or high grade cast steel • Surface finish NTE 63 µ in • Material hardness 40–45 RC steel / 200–280 BHN cast steel
Grade B
Nominal Dimensions (inch)
Designating Size
Maximum Capacity
Length 1.625 2.000
Width 1.250 1.500
Height 1.250 1.500
1 2
1.000 1.500
All dimensions in inches. Type III, Quadruple V-Groove Block.— The Type III, Quadruple Groove Block shall have four V-grooves, one on each of the four sides. This type shall be furnished in Grade A or B. Grade A shall be of a steel alloy and conform to the dimensions and accuracy toler ances defined in Table 7.
Fig. 9. Type III, Style 2 Quadruple V-Block
Fig. 10. Type IV, Style 1 Combination Top and End V-Block
Fig. 8. Type III, Style 1 Quadruple V-Block
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online