RAFT1

This routine will calculate the main skeleton1 of a simple common-pitched hip-roof, given:

- Pitch- cRun (The horizontal length from over the outside of the plate to the face of the ridge)- HAP (Height Above Plate; i.e. Heel Height)

Items calculated by this routine are:- Rafter length in FIS (Feet - Inches - Sixteenths)- Calculated Rise in FIS- Ridge Height in FIS- Hip Hypotenuse in FIS (Hip Length along the top of the board)- Hip Run in FIS- Hip Angle- Back Bevel

As with all of these routines, the user is “prompted” to enter the required numbers so that the calculation can be performed.

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1 Skeleton. The skeleton of the roof is comprised of all ridges, at least 4 opposing common rafters per ridge or some other means to correctly locate the ridges as well as all hips and valleys.

Here is what the actual routine looks like when keyed into the calculator.

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Original PURGE method CLEER purge subroutine

The keystrokes to enter/store, in an HP scientific calculator, in RPN mode are below:

<< “Pitch” “” INPUT OBJ ‘O’ STO O 12 / ‘P’ STO “cRUN FIS” “” INPUT OBJ INSH ‘R’ STO “HAP Inch” “” INPUT OBJ ‘H’ STO

R P ATAN COS / ‘A’ STOR P * ‘B’ STO H B + ‘C’ STOR SQ 2 * √ ‘D’ STOD SQ B SQ + √ ‘E’ STOB D / ATAN ‘F’ STOO 288 √ / ATAN SIN ATAN NUM ‘G’ STO

G ‘BackBevel‘" TAG F ‘HipAngle‘ " TAGD ‘HipRun‘" TAGE ‘HipHyp‘" TAGC ‘RidgeHt’" TAGB ‘cRise’" TAGA ‘Rafter’" TAG

CLEER >>

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WALLMAXX, INC COPYRIGHT © 2012 ALL RIGHTS RESERVED