Unitrol SOLUTIONi - Page 26

FIRST TIME CONTROL SETUP
SECTION B, PAGE 3
Use the following sections to identify your type of welder air
cylinder and calculate the area (SQUARE INCHES) to be entered.
B4.1 AREA OF SINGLE-PISTON CYLINDERS:
If your welder has a single piston air
cylinder, the AREA of CYLINDER can
be found on the chart below.
* For cylinders over 99.9 in
2
, change the range
as shown on the next page.
For non-standard diameters or metric cylinders,
this value can be calculated as:
AREA of CYLINDER = .785 X INSIDE DIAMETER X INSIDE DIAMETER
Example: For a 4” inside diameter cylinder:
AREA = .785 X 4” X 4” = .785 (16”) = 12.56 square in.
For welders with a CYLINDER AREA less than 99.9
square inches, skip to B5.
AIR CYLINDER
INSIDE DIAMETER
(INCHES)
AREA of CYLINDER
(SQUARE INCHES)
2
3.1
2-1/2
4.9
3
7.1
3-1/2
9.6
4
12.6
4-1/4
15.9
5
19.6
5-1/2
23.7
6
28.3
8
50.1
10
78.5
12
113.5*
SKIP
SINGLE PISTON AIR CYLINDER
TYPICAL PRESS
WELDER WITH
A STANDARD
SINGLE-PISTON
AIR CYLINDER
ON TOP OF WELDER
TYPICAL ROCKER ARM
WELDER WITH
A STANDARD
SINGLE-PISTON
AIR CYLINDER
BEHIND WELDER
To estimate the INSIDE DIAMETER of a single
piston cylinder, subtract 1/8” from the OUTSIDE
DIAMETER of the cylinder body and round. Typical
U.S. manufacturers use diameters in ½”
increments (3”, 3-1/2”, 4”, 4-1/2”, 5”, etc.).
INSIDE
DIAMETER