Abrasive Blasting, Shot Peening & Surface Prep calculator
Blast Part Rotation, Rigging and Handling Time Calculator
Model part rotation as repeatable events with explicit handling minutes and a rigging allowance. Enter parts, rotations per part, minutes per event, batch setup, the allowance and the required crew.
What this calculator does
- Rotation events, labor content and elapsed handling time from handling minutes, setup, allowance and crew size.
Formula used
- Rotation events = parts × rotations per part
- Base elapsed time = events × handling minutes ÷ 60 + rigging setup minutes ÷ 60
- Elapsed time = base elapsed time × (1 + allowance % ÷ 100)
- Labor content = elapsed time × crew size; base and allowance labor scale the same way
Inputs explained
- Parts: Parts using the modeled rotation method.
- Rotations per Part: Required repositioning events after initial placement.
- Handling Minutes per Rotation: Position, secure and verify time for one rotation event.
- Batch Rigging Setup: One-time crane, fixture, sling and lift-plan setup.
- Rigging and Safety Allowance: Allowance for normal handling variation and prescribed checks.
- Rotation Crew: People required and working concurrently on each event.
How to use the result
- Best suited to blast room schedule, rigging labor estimate, fixture improvement case.
- Not a lift plan or rigging capacity calculation. Safety procedure and manufacturer limits control regardless of the output.
Common questions
- Why separate labor and elapsed time? A three-person, one-hour rotation consumes three labor-hours but only one clock hour, and the two numbers drive different decisions.
- Does this approve a rigging method? No. The approved lift plan, hardware ratings and safety procedure are separate prerequisites that override any time estimate.
- Should initial loading count as a rotation? No when its time is modeled elsewhere. Count only repositioning events so the labor is not duplicated between stages.
- Can fixtures reduce rotations? Potentially, but validate blast access, impact angle, part stability, surface protection and safe load limits before adopting the fixture.
Last reviewed 2026-10-01.