Cutting Tool Life: A Change Register for Each Edge

Track tool life against a specific tool and cutting edge, using a defined counter such as parts or minutes in cut. At every change, retain the ending count, reason, last accepted inspection and the next edge identity before resetting the counter.

A supervisor sees three entries labelled “tool change” and cannot tell whether the insert reached its planned limit, chipped early or was removed for a different job. Those events need different responses. The register below gives the setter and process engineer enough context to decide what happened without guessing from machine downtime.

Define what one life record means

Identify the tool assembly, insert or cutter, edge number where applicable, operation, workpiece material, program revision and approved cutting conditions. Choose one primary life unit. Machine powered-on hours include time when the edge is not cutting; parts alone can hide different cutting lengths. If you use both parts and minutes in cut, retain both definitions.

The process engineer sets the approved replacement criteria using the application, tool supplier guidance and validated shop practice. The log records those criteria; it does not invent them. Sandvik Coromant distinguishes flank wear, crater wear, built-up edge, thermal cracking and chipping. Record the observed condition accurately, and leave uncertain classifications for technical review.

Reconcile the counter before changing the edge

The example gives 144 / 360 = 0.4 cutting minutes per part. It is an illustrative accounting check, not a recommended tool-life limit. If 10 trial pieces also used this edge but were omitted from the job counter, record them explicitly: the true part total is 370, and the apparent rate above no longer describes every cut.

Treat an early failure as a different event

When an edge chips or a result moves outside the allowed condition, follow the approved stop and containment procedure. Record the last accepted check, potentially affected output, observed damage and the person deciding disposition. Do not assume that replacing the insert makes earlier output acceptable.

Photograph the removed edge when this can be done safely under the site method. Preserve its identity if engineering needs to inspect it. Separate observations from diagnoses: “visible chip on edge 2” is an observation; “wrong grade caused failure” requires investigation. Log parameter changes and the authority for them rather than quietly extending the planned life.

If a serviceable tool is removed for a job change, retain its accumulated life and storage identity. Reinstalling it does not make it new. For a reconditioned tool, start a new service episode linked to the prior record and the approved reconditioning evidence.

Check the next edge and close the record

The setter confirms the new identity and applicable setup checks. Quality or the authorised role records the required first check under the control plan. The supervisor closes the change only when the old edge history, affected output decision and new release evidence are all present.

Review early changes separately from planned indexing. A weekly count can show how many records lack a reason or a last accepted check; it cannot by itself prove that tooling performance improved. Compare equivalent material, operation and cutting conditions before interpreting life differences.

Connect tooling records to the job

In Optiwise, we support custom process data and production photographs alongside configurable inspection forms. Use our no-code form builder for the edge register and link it to the job. Define counter entry and reset responsibility during implementation; do not treat a generic machine runtime signal as automatic per-edge life.

Tool-life questions

Should rejected parts count towards tool use?

Yes, if the edge cut them. Record physical tool use separately from accepted production output.

Can we copy the longest observed tool life as the new limit?

No. Engineering must evaluate comparable conditions, wear and quality evidence before changing an approved criterion. A single long run is not validation.

Bring one tool-change record to a production-workflow demo.