Jack Rafters - Using Other Than 16 Inch On-Center Spacing - Calculated Industries 44080 Construction Master Pro Desktop v3.0 User Manual

(Cont'd)
KEYSTROKE
3. Find Jack rafter lengths and cut angles:
j
j
j
j
j
j
j
j
j
j
j
*Note: If display does not read JKOC 16 INCH (the default), then reset on-center
spacing by pressing 1 6 i ß 5 .
Jack Rafters — Using Other Than 16 Inch On-Center Spacing
A roof has a 9/12 pitch and a run of 6 feet 9 inches. Find the jack
rafter lengths and cut angles at 18-inch (versus 16-inch) on-center
spacing. The on-center spacing is used for both regular and irregular
jack calculations.
KEYSTROKE
1. Enter pitch, run and spacing:
o o
9 i p
6 f 9 i R
1 8 i ß 5
2. Find Jack rafter lengths and cut angles:
j
j
j
j
j
j
j
j
j
3. Reset on-center spacing to default 16-inch:
1 6 i ß 5
JKOC 16
JK1 8
FEET
JK2 6
FEET
JK3 5
FEET
JK4 3 6-13/16
FEET
JK5 2 0-5/16
FEET
JK6 0 5-13/16
FEET
JK7 0
FEET
PLMB 30.26°
LEVL 59.74°
CHK1 45.00°
PTCH 9
RUN 6
FEET
OC STORED 18
JKOC 18
JK1 6
FEET
JK2 4
FEET
JK3 2
FEET
JK4 0 11-1/4
FEET
JK5 0
FEET
PLMB 36.87°
LEVL 53.13°
CHK1 45.00°
OC STORED 16
U ' G
SER S
DISPLAY
*
INCH
2-3/8
INCH
7-7/8
INCH
1-3/8
INCH
INCH
INCH
INCH
0
INCH
DISPLAY
0.
INCH
9
INCH
INCH
INCH
6-3/4
INCH
8-1/4
INCH
9-3/4
INCH
INCH
0
INCH
INCH
— 67
UIDE