Why does the default share sit at 85 percent?

Mixed impeller runs often send only part of the lot through the full machining sequence. Set the share from the route sheet for this run, up to 100 percent.

What does budget variance show?

It is the machining budget minus the run total. A positive number is money still available for this run; a negative number is the overrun to absorb or re-quote.

How does run size change the per-impeller cost?

The fixed setup and fixturing charge stays the same as the count grows, so it spreads thinner across the run. Doubling a small lot can cut the per-impeller figure sharply.

Can the full-machining share exceed 100 percent?

No. The share describes part of one run, so it cannot pass 100 percent. More full-machining impellers than the run contains is impossible, so the page blocks that entry.

Water, Wastewater & Pump Systems Manufacturing calculator

Impeller Machining Cost Calculator

Price an impeller machining run from the count, the per-impeller cost, the share needing full machining and one fixed fixturing charge. The budget check shows whether the run fits before the job releases.

What this calculator does

Machining cost for an impeller run with a full-machining share, plus fixed fixturing, against the budget.

Formula used

Variable machining cost = impellers to machine × machining cost per impeller × share ÷ 100
Total impeller machining cost = variable machining cost + fixed setup and fixturing cost
Cost per impeller = total impeller machining cost ÷ impellers to machine
Budget variance = machining budget − total impeller machining cost

Inputs explained

Impellers to Machine: Impeller blanks in this machining run, from the job ticket.
Machining Cost per Impeller: Quoted or standard machining cost per impeller.
Share Needing Full Machining: Share of impellers that need the full machining sequence.
Fixed Setup and Fixturing Cost: Setup, tooling and fixturing charged once per run.
Machining Budget: Budget this machining run must stay within.

How to use the result

Best suited to quoting an impeller machining run, choosing a run size that spreads fixturing.
Setup can repeat if the run splits across machines or shifts. Scrap and rework stay outside the quote unless the quote includes them.

Current U.S. benchmarks

The U.S. has 21,668 machinery manufacturing establishments employing about 1,086,146 workers (Census County Business Patterns, 2023).

Common questions

Why does the default share sit at 85 percent? Mixed impeller runs often send only part of the lot through the full machining sequence. Set the share from the route sheet for this run, up to 100 percent.
What does budget variance show? It is the machining budget minus the run total. A positive number is money still available for this run; a negative number is the overrun to absorb or re-quote.
How does run size change the per-impeller cost? The fixed setup and fixturing charge stays the same as the count grows, so it spreads thinner across the run. Doubling a small lot can cut the per-impeller figure sharply.
Can the full-machining share exceed 100 percent? No. The share describes part of one run, so it cannot pass 100 percent. More full-machining impellers than the run contains is impossible, so the page blocks that entry.

Last reviewed 2026-10-01.