CNC estimating: price the complete route, not only cutting time

A fast cycle-time prediction is useful only after the estimator knows what the number includes. Cutting time is one input to a complete route. It does not automatically include programming, setup, loading, inspection, deburring, purchased processes or the commercial risk of an incomplete print. Start a software evaluation with your route rather than a vendor’s speed claim.

Build a cost bridge

For each operation, record the cost basis, quantity basis, source and owner. Separate fixed batch work from per-piece work. Programming and initial setup can be fixed for a lot; loading and measurement may recur per piece. An attended machine rate may already include operator labor. Adding another labor charge without checking its composition can count the same cost twice.

Use a fictional example to inspect the arithmetic: a batch has $300 of programming and setup, $18 of material and purchased work per good part, and $12 of variable conversion cost per good part. At ten good parts the simplified cost is $300 + 10 × $30 = $600, or $60 each. At fifty good parts it is $36 each. These are illustrative inputs, not machine-shop benchmarks. Scrap, minimum supplier charges and additional setups may change the relationship.

The selling price is a separate decision. If this simplified $60 cost must support a 25% gross margin, price is $60 ÷ 0.75 = $80. A 25% markup produces $75 and a 20% gross margin. Keep the labels explicit in the software and exported quote.

Run a controlled demonstration

Ask the vendor to process a redacted part at two quantities using your rates. Require a visible list of included and excluded activities. Then change material, one tolerance and an outside-process minimum charge. Observe which assumptions update automatically and which require estimator approval. A total without an inspectable explanation is difficult to improve after production.

Retain the model version, drawing revision, routing and rate-table version with the estimate. Also save the estimator’s overrides and reasons. A later user should be able to distinguish a system default from an intentional decision about workholding or inspection.

Close the loop

Compare estimate and actual records at the same revision, quantity and scope. Separate an underestimated setup from a production interruption. A useful review identifies the next assumption to change. If time capture is incomplete, label that limitation before treating the result as a quoting failure.

Paperless Parts describes configurable manufacturing costing and ProShop describes estimating and job-costing workflows. Those published capabilities justify targeted demonstrations, not a claim that either predicts your parts accurately. This is an editorial evaluation framework, not a hands-on benchmark. Ask candidates to explain exact operation coverage and validate it on representative work before relying on automated prices.