Calculated Industries 4065 v3.0 - Manual (Page 68)

U SER ’ S G UIDE — 67
(Cont’d)
KEYSTROKE DISPLAY
3. Find Jack rafter lengths and cut angles:
j JKOC 16 INCH *
j JK1 8 FEET 2-3/8 INCH
j JK2 6 FEET 7-7/8 INCH
j JK3 5 FEET 1-3/8 INCH
j JK4 3 FEET 6-13/16 INCH
j JK5 2 FEET 0-5/16 INCH
j JK6 0 FEET 5-13/16 INCH
j JK7 0 FEET 0 INCH
j PLMB 30.26°
j LEVL 59.74°
j CHK1 45.00°
*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 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 OC STORED 18 INCH
2. Find Jack rafter lengths and cut angles:
j JKOC 18 INCH
j JK1 6 FEET 6-3/4 INCH
j JK2 4 FEET 8-1/4 INCH
j JK3 2 FEET 9-3/4 INCH
j JK4 0 FEET 11-1/4 INCH
j JK5 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 OC STORED 16 INCH
4065UG-E-B 6/9/04 1:50 PM Page 67