V-Block Types Table 2. Accuracy and Dimensions, Type 1, Style 3 Machinists’Table Block Machinery's Handbook, 31st Edition
736
Permitted Deviations (inch)
Parallelism of “V” to Base and Side 0.0003
Designating Size
Flatness of Working Faces
End/Side Square to Base
Parallelism of Opposite faces
“V” Centrality
Matching Tolerance
Grade A 0.0001 Grade B 0.0004
0.0002
0.0002 0.001
0.0003 0.002
0.0002 0.001
0.002
0.002
Grade Characteristics
• Steel alloy or mild steel • Material hardness 40 to 62 RC • Mild steel or fine grained cast steel
Grade A • Up to 6.375”
• Surface finish NTE 32 µ in
• Up to 6.375”
• Surface finish NTE 63 µ in • Material hardness 40–45 RC steel / 200–280 BHN cast steel Grades A & B Designating Size Nominal Dimensions (inch) Length Width Height
Grade B
Maximum Capacity
1 2 3 4 5 6
1.375 2.125 2.250 2.875 6.000 8.000
1.375 2.375 2.9375 4.000 6.000 8.000
1.125 1.875 1.9375 2.875 6.000 8.000
0.75 1.500 2.000 3.000 4.500 6.375
All dimensions are in inches. Type 1, Style 4, Magnetic Clamping Blocks.— Style 4, magnetic clamping blocks shall be similar to Fig. 4 and conform to the dimensions and accuracies shown in Table 3. Mag netic clamping V-blocks shall be either made of mild steel laminated with brass or an assembly of mild steel with an embedded magnetic core that can be disengaged to allow positioning of work piece. Style 4 magnetic clamping blocks shall have a ground finish on the sides, top, bottom, and V-grooves.
Fig. 5. Type 1, Style 5 Ribbed without Clamps
Fig. 4. Type 1, Style 4 Magnetic Clamping V Blocks
Type 1, Style 5, Ribbed without Clamps.— The Style 5 block shall be designed without clamping capability for the work piece. The block shall be similar in design to Fig. 5 and conform to the dimensions and accuracies shown in Table 4. The Style 5 block shall be of ribbed design to provide strength with light weight. There may be lightening holes in the webbing section to reduce weight without affecting the performance capabilities. The Style 5 block shall be of a design as to facilitate clamping to a machine table or plate.
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