The cylinder piston rod, and in some situations
(
mount dependent) the cylinder acts as a column subject to both
compressive stress and buckling loads created as the result of
the mount selection, length of stroke and orientation of in-
stallation.
During full cylinder extension the introduction of a
'
Stop Tube' acts as a spacer between the piston and rod bearing to
reduce bearing side load. The stop tube does not improve column
strength.
The standard rod diameter/bore size configuration is rec-
ommended (especially in 'Pull' applications) unless the applica-
tion requires greater column strength.
SELECTING ROD DIAMETER -
For Specific Bore Size:
From the opposite page determine the potential thrust for the se-
lected cylinder bore. Using the data provided herein determine the
value of 'M', including any adjustment for stop tube. In the chart
'
VALUE OF M' locate the row corresponding to thrust and along the
row locate the value 'M', and then read up the column to determine
the required rod diameter.
TO DETERMINE THE VALUE OF 'M':
Rigid Mount - Front (Style F)
M = Stroke + Dimension W
Rigid Mount - Rear (Style R)
M = Stroke + Dimension XF*
Clevis Mount (Styles C, CE, CS, CT)
M = Stroke + Dimension XC*
Intermediate Trunnion Mount (Style T)
M = Stroke + Dimension XI
USE OF CHART - VALUE OF 'M':
Horizontal cylinder applications are limited to the
values of 'M' shown within the bordered area; Vertical
cylinder applications require no such limitation.
STOP TUBE REQUIREMENT -
If Any:
Stop tube length 'ST' is determined using the following:
ST = (E - 40) / 10
Where:
E = M / 2 .....
firmly guided rod end
E = 4M ........
unsupported rod end
E = M ..........
supported rod end
*
DATA REPRESENTS ONE-HALF THE THEORETICAL LIMIT FOR THE VALUE ‘M’
Page 14
COLUMN STRENGTH
STOP TUBE & ROD SELECTION
CHART - VALUE OF ‘M’ IN INCHES FOR VARIOUS ROD DIAMETERS*