Calculated Industries 4090 - Manual (Page 12)

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— 11
Using the Pythagorean Theorem, the top row of keys on your ITI
Sheet Metal/HVAC Pro provides instant solutions in dimensional format
to Right Triangle problems for sheet metal problems and roof framing.
The Right Triangle is calculated simply by entering two of four variables:
1) x (Run)
2) y (Rise)
3) r (Diagonal, or Hypotenuse); or
4) θ (Theta/Pitch).
R Run — Enters or calculates “x,” or the Run or hori-
zontal leg (base) of a Right Triangle.
r Rise — Enters or calculates “y,” or the Rise or verti-
cal leg (height) of a Right Triangle.
d Hypotenuse or Diagonal (for Roof Framing) —
Enters or calculates the Hypotenuse or diagonal leg
of a Right Triangle. Typical applications in construc-
tion/framing are “Squaring-up” slabs or finding
Common rafter lengths. Additional presses of the
d
key will also display Plumb and Level cut angles in
degrees.
Note: The Common rafter calculation is the “point-to-point” length
and does not include the overhang or ridge adjustment.
p Theta — Enters or calculates the Pitch (slope) of a
roof (or Right Triangle). Pitch is the amount of “Rise”
over 12 Inches of “Run.” Pitch may be entered as:
• a Dimension: 9 i p
• an Angle or Degrees: 3 0 p
• a Percentage (percent grade): 7 5 Ç + p
Once a Pitch in one of the above formats is entered,
consecutive presses of
p will convert to the remain-
ing pitch formats listed above (e.g., Pitch in Inches
will convert to Pitch Degrees, Percent Grade and
Pitch Ratio/Slope).
Note: An entered (vs. calculated) Pitch is a permanent entry. This
means that it will remain stored even after you turn the calculator
off. To change the Pitch, simply enter a new Pitch value.
In contrast, a calculated Pitch value is not permanently stored.
This means that the calculator will return to the Pitch value you
last entered when you press
o twice.