Proper Dimensions for your V-Band Coupling Application
Using Dial Calipers
Use dial calipers to measure the largest or "outside" diameter of your flange as shown in illustration 1a. (or use a "pi" tape rule as shown in illustration 1b.) Denote this outside flange diameter as (fd).
OR
Using Tape Rule
Use a narrow tape rule to determine the flange circumference (c) as shown in 1b.
Use the formula: Flange Diameter = c ÷ 3.1416
Use dial calipers to measure the "base" diameter of your flange as shown in illustrations 2a and 2b. This dimension can also be measured with a narrow tape rule or with a "pi" tape rule as shown in illustration 1b. Denote this base diameter as (bd).
To determine the height of your flange, you can use the previously measured outside flange diameter (fd), and the flange base diameter (bd).
Use the formula: Flange Height, fh = ( fd – bd ) ÷ 2
This dimension is best determined by measurement with an optical comparator or from the actual design print of the flange. However, it can be measured with great care using dial calipers as shown in illustration 4a. Denote this flange apex as (a).
*Remember that O-rings and gaskets will change your final width dimensions.
This dimension is best determined by measurement with an optical comparator or from the actual design print of the flange. However, it can be measured with care using dial calipers as shown in illustration 5a. Denote this base width as (w).
*Remember that O-rings and gaskets will change your final width dimensions.
This dimension is best determined by measurement with an optical comparator or from the actual design print of the flange. However, it can be determined by using the previously measured flange apex (a), flange base (w), and flange height (fh).
Use the formula: Flange Angle = TAN¯1 [ ( w – a ) ÷ fh ]
