Johnson-level-tool-mfg RAS-1 Manuale Utente Scaricare il pdf (Pagina 33)

STEP 2. LAYOUT STRINGER: First, ﬁnd the step incline

length(seeFigure18)byusingthefollowingformula:

STEP INCLINE = (STEP RISE)

+ (STEP RUN)

Inourexample:

STEP RISE = 7.29

STEP RUN = 10.21

USING THE FOLLOWING INCLINE FORMULA:

STEP INCLINE = (7.29)

+ (10.21)

= (53.14) + (104.24)

= 157.38

= 12.545

NOTE: The symbol is the square root symbol.

Second, ﬁnd the stringer incline length by using the

following formula:

Stringer Incline Length =

Step Incline Length x (number or steps – 1)

Inourexample:

Stringer Incline Length = 12.545 x (14 – 1)

= 12.545 x (13)

= 163.085 Inches

= 13 ft. 7-1/16 Inches

NOTE:TableBonPage30showstheinchdecimaltoinch

fraction conversion.

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 66 67

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Johnson-level-tool-mfg RAS-1 Manuale Utente Pagina 33