Calculated Industries 4065 v3.0 - Manual (Page 69)

68 — C ONSTRUCTION M ASTER ® P RO / T RIG / D ESKTOP
Irregular Hip/Valley and Jack Rafters — Descending, with
On-Center Spacing Maintained
You’re working with a 7/12 pitch and half your overall span is 4 feet.
The irregular pitch is 8/12, and 16 inch on-center spacing is main-
tained on both sides. Complete the following steps:
(1) Find the length of the common rafter;
(2) Reset calculator to 16 inch on-center spacing;
(3) Enter the irregular pitch; find the length of the adjoining
“irregular” Hip (or Valley) and the cut angles;
(4) Find the jack lengths on the “irregular” pitch side (16 inch
on-center spacing);
(5) Find the cut angles;
(6) Find the jack lengths on the “regular” pitch side (16 inch
on-center spacing);
(7) Find the cut angles.
KEYSTROKE DISPLAY
1. Find Common rafter length:
o o 0.
7 i p PTCH 7 INCH
4 f R RUN 4 FEET 0 INCH
d DIAG 4 FEET 7-9/16 INCH
2. Enter on-center spacing:
1 6 i ß 5 OC STORED 16 INCH
3. Find irregular Hip/Valley rafter length and cut angles:
8 i Ç H IPCH 8 INCH
H IH/V 5 FEET 9-11/16 INCH
H PLMB 23.70°
H LEVL 66.30°
H CHK1 41.19°
H CHK2 48.81°
(Cont’d)
4065UG-E-B 6/9/04 1:50 PM Page 68