TYK Rigging Skills And Techniques Flashcards
Can you describe what should be included in rigging design?
Requirements of production and meeting them within the constraints of the building, budget, time and safety and other constraints.
The final design shows:
- How it meets production requirements
- how risks are mitigated by the design process
- plot showing dims, weights and direction of forces on attachments to structure.
- instructions to mitigate misinterpretation
What checks should you make before applying loads to a structure?
The proportion of load as shared between two supports
The equation is L1=(w×d2)/D
Where L1 is load on one support and d1+d2 = D (distance between both supports). d1 is the distance between the weight and L1.
Who should agree the rigging plot?
A representative of the venue with the correct authority. Likely to be a technical manager or engineer who understands the limitations of the venue.
Can you estimate the loads in multi point systems?
Calculate as each singular point load and add them.
For instance if a point is 25% of the span of a beam and another is 50% of the span, L1 will take 75% of the mass.
If both points are 500kg then L1 is taking 750kg to L2’s 250kg.
Explain two methods of calculating angular forces
Trigonometry and scale drawing.
Trigonometry uses a series of calculations and can be highly accurate
Scale drawings are approximate but is represented by a closed polygon. A scale is chosen (eg 1cm =20kg) the bridle is drawn in scale and the legs are measured to determine rough distributions.
What checks should be made before marking out?
The scale of your drawing and precise datum.
That the datum is correct using setting lines or triangulation.
Explain the importance of clear communication and describe factors that can affect it.
To avoid danger- if communication becomes impossible then work should be stopped.
Things that can affect communication are:
Distance
Ambient noise
Obstructions of vision
Lack of protocols
Language barrier
Ambiguity
Disability
Lack of knowledge
Some good alternative ways to communicate are radios and hand signals as well as agreed protocols of communications fail.
What are the advantages and disadvantages of different SWR terminations?
A permanent termination of a SWR such as a soft or hard eye using a ferrule maintains its SWL and helps to eliminate user error.
Terminating SWR on site can help produce bespoke lengths of SWR or allow it to pass through small spaces. This can be essential in theatres or diversion systems.
Describe the requirements for secondary suspension in context of theatrical flying
Secondary attachments are sometimes necessary where progressive collapse could follow the failure of one component.
It should:
- Withstand a shock load
- Be of limited combustability
- Securely attached
- Arranged so as to minimise the shock load
- Attached to maintain proper orientation of the load
