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KEYSTROKE DISPLAY
3. Find regular incremental Jack adjustment and regular Jack rafter
lengths and cut angles:
j JKOC
STORED
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 —
A roof has a 9/12 Pitch and a run of 6 Feet 9 Inches. Find the incre-
(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
STORED
18 inch
2. Find regular incremental Jack adjustment and regular Jack rafter
lengths and cut angles:
j JKOC
STORED
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
STORED
16 inch
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