Appendix C - Offset Formulas - Calculated Industries Sheet Metal/HVAC Pro Calc User Manual

APPENDIX C — OFFSET FORMULAS
With Offset = "y" and Length = "x,"
θ = ArcSin
CenterlineRadius =
WrapperLength (aka StretchOut) = CenterlineRadius * ArcK * 4θ
HeelRadius = CenterlineRadius + (a ÷ 2)
ThroatRadius = CenterlineRadius – (a ÷ 2)
104 — S M
HEET
( )
Offset
SlantLength
SlantLength
/HVAC P
ETAL RO
(
Offset
= ArcTan
Length
=
4Sin(θ)
C
ALC
) ( )
y
= ArcTan
x
SlantLength
2
4 * Offset