Руководство Пользователя для Calculated Industries Construction Master Pro

You’re working with a 7/12 Pitch and half your overall span is 4 Feet.
The Irregular Pitch is 8/12, and the Jacks need to mate at the Hip.
The maximum allowable On-center spacing is 16 Inches. Find the
Jack rafter sizes from smallest to largest (ascending order).
Complete the following steps:

(1) Set Preference display to “JK ASCEND” (Jack sizes in

ascending order);

(2) Set Preference display to “IRJK JAC-JAC” (Jacks mate);
(3) Find the length of the common rafter; 
(4) Find the length of the adjoining “Irregular” Hip (or Valley) and

the cut angles; 

(5) Find the o.c., incremental jack adjustment, Jack lengths and

cut angles on the “Irregular” pitched side; 

(6) Find the o.c., incremental jack adjustment, Jack lengths and

cut angles on the “Regular” pitched side.

Note: After completing this example, you may need to reset the Preferences back to
“IRJK OC-OC” if you do not normally figure jacks in this manner. (See Preference
Settings on page 83.)

1. Review Preferences until you find “Jack Descend”:

o o

Ç ß 

(Prefs)

(If not at 1/16, press 

+

until 1/16 is displayed)

ß

ß

ß

ß

ß

ß

Set Preference to “Ascend”:

+

(plus sign)

2. Set Preference to “Jacks Mate”:

ß

+

(plus sign)

3. Find common rafter length:

7 i p

4 f R

d

(Cont’d)