Calculated Industries 4065 - Jack Rafters - Using Other than 16-Inch On-Center Spacing

U SER ’ S G UIDE — 61
(Cont’d)
KEYSTROKE DISPLAY
3. Find regular incremental Jack adjustment and regular Jack rafter
lengths and cut angles:
j JKOC 16 INCH*
j INCR 1 FEET 6-1/2 INCH
j JK 1 8 FEET 2-3/8 INCH
j JK 2 6 FEET 7-7/8 INCH
j JK 3 5 FEET 1-3/8 INCH
j JK 4 3 FEET 6-13/16 INCH
j JK 5 2 FEET 0-5/16 INCH
j JK 6 0 FEET 5-13/16 INCH
j JK 7 0 FEET 0 INCH
j PLMB 30.26°
j LEVL 59.74°
j CHK1 45.00°
*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 incre-
mental jack adjustment, 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 DISPLAY
1. Enter Pitch, Run and spacing:
o o 0.
9 i p PTCH 9 INCH
6 f 9 i R RUN 6 FEET 9 INCH
1 8 i ß 5 (o.c.) OC 18 INCH
2. Find regular incremental Jack adjustment and regular Jack rafter
lengths and cut angles:
j JKOC 18 INCH
j INCR 1 FEET 10-1/2 INCH
j JK 1 6 FEET 6-3/4 INCH
j JK 2 4 FEET 8-1/4 INCH
j JK 3 2 FEET 9-3/4 INCH
j JK 4 0 FEET 11-1/4 INCH
j JK 5 0 FEET 0 INCH
j PLMB 36.87°
j LEVL 53.13°
j CHK1 45.00°
3. Reset On-center spacing to default 16-inch:
1 6 i ß 5 (o.c.) OC 16 INCH
STORED
STORED
STORED
STORED