Abrasive Blasting, Shot Peening & Surface Prep calculator
Blast Cabinet Load and Shift Capacity Calculator
Estimate practical blast-cabinet load and shift capacity from usable cabinet volume, one-part envelope volume, part weight and blasting time. The calculator checks both volumetric nesting and fixture-weight limits, selects the binding parts-per-load value and converts it into complete cycles and accepted parts per shift. Handling, blowoff, inspection, shift duration, downtime and first-pass yield are fixed and documented to keep the form at four fields. This is a production-planning tool, not a safety approval: access, part separation, blast shadowing, fixture strength and machine manufacturer limits must still be verified.
What this calculator does
- Constrain cabinet loading by both usable volume and safe fixture weight, then convert complete cycles into accepted shift output.
- Use it for shift capacity, fixture redesign, batch-size standard work, screening a proposed part family for cabinet loading and shift-capacity feasibility..
- Constrain cabinet loading by both usable volume and safe fixture weight, then convert complete cycles into accepted shift output.
Formula used
- Parts per load is the lower of volume-based and weight-based capacity; accepted shift output uses fixed handling, downtime and yield assumptions.
- Fixed secondary assumptions compiled into this release: Usable nesting factor: 65 %; Maximum safe loaded weight: 1000 lb; Load and unload time: 8 min; Blowoff and media-drain time: 4 min; Blocking inspection time: 8 min; Shift length: 480 min; Planned downtime: 60 min; First-pass accepted parts: 95 %.
Inputs explained
- Usable cabinet loading volume: Volume that can be loaded without obstructing guns, motion, or safe clearance.
- Part loading envelope: Effective occupied volume per part including spacing and orientation.
- Part weight: Representative individual part weight.
- Blast time: Active cabinet blast duration per load.
How to use the result
- Best suited to shift capacity, fixture redesign, batch-size standard work, screening a proposed part family for cabinet loading and shift-capacity feasibility..
- The four-input result is conditional on the disclosed fixed assumptions; use a detailed engineering model when they are not representative. Does not validate ergonomics, fixture stability, or gun coverage. Does not optimize mixed-part nesting. Equipment manufacturer limits control. The tool cannot verify blast access, part movement, fixture strength, ergonomic limits or cabinet manufacturer restrictions.
Common questions
- Why use part envelope? Parts require spacing, orientation, gun access, and media drainage; solid material volume overstates usable loading density. The fixed secondary assumptions are listed on this page and in the downloadable workbook so the four-input result remains auditable.
- What if weight is the constraint? The weight-limited whole-part count controls even when more parts fit geometrically. The fixed secondary assumptions are listed on this page and in the downloadable workbook so the four-input result remains auditable.
- Can I include inspection outside the cabinet cycle? Remove it from the cycle only when inspection truly occurs in parallel and cannot delay the next load. The fixed secondary assumptions are listed on this page and in the downloadable workbook so the four-input result remains auditable.
- Does capacity prove process uniformity? No. Validate coverage, profile, cleaning, and part interaction at the selected load pattern. The fixed secondary assumptions are listed on this page and in the downloadable workbook so the four-input result remains auditable.
- What is part envelope volume? It is the three-dimensional space one fixtured part occupies while preserving the clearance needed for loading, movement and blast access—not the solid material volume from CAD. Include protrusions and practical spacing. Using net material volume can overstate the number of parts that physically and safely fit.
Last reviewed 2026-08-24.