If rework occurs, the full event cost is spent. Expected exposure is the probability-weighted amount used for planning across uncertain work. The fixed secondary assumptions are listed on this page and in the downloadable workbook so the four-input result remains auditable.

Should probability include severity?

No. Probability is occurrence likelihood. Consequence is represented by the full event cost and any separately governed risk. The fixed secondary assumptions are listed on this page and in the downloadable workbook so the four-input result remains auditable.

Can I add schedule impact?

Add a defensible incremental cost bucket or model schedule impact separately; do not hide it in probability. The fixed secondary assumptions are listed on this page and in the downloadable workbook so the four-input result remains auditable.

What if several rework modes can occur together?

Model their dependency explicitly; summing independent expected values can understate correlated events. The fixed secondary assumptions are listed on this page and in the downloadable workbook so the four-input result remains auditable.

What does expected rework exposure mean?

It is the modeled cost of one event multiplied by the estimated chance that the event occurs. It is useful for comparing risks and setting portfolio-level contingency, but it is not the invoice when failure occurs. The full-event result remains the relevant consequence for cash and schedule planning.

How should I estimate event probability?

Use completed-job history for the same failure definition, process and acceptance basis whenever possible. For new work, document a structured estimate and its evidence, then update it after production. Do not reduce probability simply to make the quote fit a target margin or treat unlike defects as interchangeable.

Abrasive Blasting, Shot Peening & Surface Prep calculator

Abrasive Blast Rework Event and Expected-Cost Calculator

Estimate the financial exposure created by a possible blast rework event using rework area, accepted production rate, loaded labor rate and event probability. The calculator converts area into rework hours, applies documented baseline crew, setup, media, compressor, waste and closeout costs, then reports full-event cost and probability-weighted exposure. It is designed for contingency review, corrective-action prioritization and quote risk—not for hiding known rework inside an average. The four visible inputs capture the job-specific decision while the fixed cost basis remains auditable in the Method section and workbook.

What this calculator does

Calculate the full cost of one rework event and keep it separate from probability-weighted expected exposure for quoting and risk decisions.
Use it for quote contingency evidence, corrective-action business case, rework reserve planning, setting a quote contingency for a defined surface-preparation failure mode..
Calculate the full cost of one rework event and keep it separate from probability-weighted expected exposure for quoting and risk decisions.

Formula used

Expected rework exposure = probability × modeled event cost from area, accepted rate and fixed crew, media, compressor and closeout assumptions.
Fixed secondary assumptions compiled into this release: Rework setup and restoration: 2 hr; Rework crew: 2 people; Rework media feed: 5 lb / min; Fresh media cost: 0.45 $ / lb; Loaded compressor cost: 20 $ / hr; Incremental waste and disposal: 300 $; Inspection and documentation: 200 $.

Inputs explained

Area reworked if event occurs: Expected affected area for one defined rework event.
Accepted rework blast rate: Accepted area per active hour for the rework condition.
Loaded labor rate: Direct cost per rework crew-hour.
Probability of this rework event: Evidence-based event probability for the quote or planning population.

How to use the result

Best suited to quote contingency evidence, corrective-action business case, rework reserve planning, setting a quote contingency for a defined surface-preparation failure mode..
The four-input result is conditional on the disclosed fixed assumptions; use a detailed engineering model when they are not representative. Does not price schedule liquidated damages or lost customer value unless entered as a direct cost. Expected value does not describe worst-case cash need. Multiple correlated rework modes require a broader risk model. Schedule penalties, lost production, customer disruption, coating removal and consequential damage are excluded.

Common questions

Why show two costs? If rework occurs, the full event cost is spent. Expected exposure is the probability-weighted amount used for planning across uncertain work. The fixed secondary assumptions are listed on this page and in the downloadable workbook so the four-input result remains auditable.
Should probability include severity? No. Probability is occurrence likelihood. Consequence is represented by the full event cost and any separately governed risk. The fixed secondary assumptions are listed on this page and in the downloadable workbook so the four-input result remains auditable.
Can I add schedule impact? Add a defensible incremental cost bucket or model schedule impact separately; do not hide it in probability. The fixed secondary assumptions are listed on this page and in the downloadable workbook so the four-input result remains auditable.
What if several rework modes can occur together? Model their dependency explicitly; summing independent expected values can understate correlated events. The fixed secondary assumptions are listed on this page and in the downloadable workbook so the four-input result remains auditable.
What does expected rework exposure mean? It is the modeled cost of one event multiplied by the estimated chance that the event occurs. It is useful for comparing risks and setting portfolio-level contingency, but it is not the invoice when failure occurs. The full-event result remains the relevant consequence for cash and schedule planning.

Last reviewed 2026-08-24.