Calculated Industries 4090 User Manual

Page 19

18 — ITI S

HEET

ETAL

/HVAC P

(Cont’d)

• Subsequent presses of the

H key will also dis-

play Plumb, Level, and Cheek cut angle values in
degrees.

Ç H

Irregular Pitch — Enters the Irregular or Secondary
Pitch value used to calculate lengths of the Irregular
Hip/Valley and Jack rafters.

You may enter the Irregular Pitch as:

• a Dimension:

9 i Ç H

• an Angle:

3 0 Ç H

• a Percentage:

7 5 З + З H

Note: An entered Irregular Pitch can be recalled by pressing

Ç H.

Jack Rafters — Finds the descending Jack rafter
sizes for Regular pitched roofs, based on the stored
on-center spacing and previously entered or calcu-
lated Right Triangle/Rafter values (e.g., Pitch, Rise,
Run).

• The default On-Center spacing is 16 Inches. A new
On-Center spacing may be entered and permanent-
ly stored by entering an Inch value prior to perform-
ing the Jack Rafters function (e.g.,

1 2 i

j). The current On-Center spacing value can be
viewed by pressing

® j.

• Repeated presses of the

j key will display all

the rafter sizes (on the regular pitch side) as well as
display the Plumb, Level, and Cheek cut angle val-
ues. Additional presses will display the rafter sizes
on the Irregular Pitch side (if an Irregular Pitch was
entered; see above), or repeat the previously dis-
played values.

Note: You may set your calculator to display the Jack rafter
lengths in either ascending or descending order (see Preference
Settings on page 107).

Note: You may program your calculator to “mate up” the Jack
rafters, rather than using the entered or default on center for both
sides (see Preference Settings on page 107).