Stage Rigging Spring 2015 Toggle navigation

DAY TWO NOTES

Center Of Gravity- self-explanatory.   Breasting- is when you take an object attach it to a pipe, beam, or what have you and then attach another line to a secondary point to move the object backwards.   Bridle- is when you hang an object with two hang points, in the shape of a “V” to get it over a certain area.   Vectors- Forces that have magnitude, Direction, and sense -Magnitude- amount of force, longer is greater, shorter is less. -Direction- Self-explanatory -Sense- positive or negative. When you add vectors, the lines go head to tail When you subtract vectors the lines go head to head  

Study SOHCAHTOA and the Pythagorean Theorem (very important when solving for vectors)

Important Formulas:

VFL=(VL*HR*P)/(VL*HR)+(VR*HL)

VFR=(VR*HL*P)/(VL*HR)+(VR*HL)

TL=(LL*HR*P)/(VL*HR)+(VR*HL)

TR=(LR*HL*P)/(VL*HR)+(VR*HL)

Load per area

Stress= Force/Area

Strain= (Tri*L)/(L*ang)

Tri= change L= Length ang= Angle

Breaking Point is the elastic range of an object that has been extended due to stress may return to its original length.

Plastic Range is the range that if reached the object will never go back to Original length.

Allowable Load

Ubs= Ultimate Breaking Strength

DF= Design Factor (higher the design factor the more space between the working load and UBS)

WLL= WORK LOAD LIMIT

WLL/SWL/RWL= UBS/DF

NEW WLL= (OLD WLL*OLD DF)/ (NEW DF)

IMPORTANT NOTE: WHEN DESIGNING A SYSTEM MAKE SURE ALL RIGGING EPUIPMENT DF ARE THE SAME