Calculated Industries Construction Master IV User Manual page 11

[Jack]
[Conv]
[Jack]
Jack Rafter — Used to find the jack
rafter sizes—from largest to small-
est—for both regular and irregular
roofs based on entered values for
Pitch, Rise, Run and/or Diagonal,
jack on-center, and (optionally)
irregular pitch (see above). Use
[Conv] [Jack] to access the irregu-
lar jack rafter mode.
The default on-center spacing for
jacks is 600 millimeters in Metric
Mode. A new on-center spacing
can be permanently set by entering
a dimension before pressing
[Jack]. For example, 750 [mm]
[Jack] will store a 750 millimeter
on-center spacing.
Irregular Jack — Accesses the irreg-
ular jack rafter mode, allowing suc-
cessive presses of the [Jack] key
(after [Conv] [Jack] is initially
pressed) to display the descending
irregular jack rafter lengths—from
longest to shortest. Based on
entered irregular pitch and on-cen-
ter spacing.
11 — User's Guide