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Key Cutting Machine Not Cutting Correctly: Checks to Run at the Machine Before Reporting a Fault

Most key machine faults come down to a handful of things you can check yourself in a few minutes — a bent tracer, a worn cutter, a loose clamp, calibration drift, or an out-of-date database. This guide walks through those checks in order, and covers what to gather, how remote diagnosis works, and the return process if the machine does need bench work.

When a key cutting machine starts producing keys that don't work, the cause is usually one of a small number of mechanical or software issues rather than a failure of the machine itself. Several of them are visible on inspection and some can be corrected on site. Working through the checks below before reporting a fault often resolves the problem the same day, and where it doesn't, the answers tell the technical team what they need to know on the first call rather than the third. 

Start by narrowing the fault

Before checking anything physical, establish what the machine is actually doing. This alone rules out several causes:

  1. Does it affect every key, or only certain blanks? A fault on one blank type points to the clamp or the blank itself. A fault across all blanks points to the tracer, cutter, or calibration.

  2. Are the cuts wrong, or does the machine refuse to cut at all? Wrong cuts are mechanical or calibration. A refusal to cut is more often software or database.

  3. Is the vehicle or blank not being found in the software? That is a database issue, not a mechanical fault, and no amount of inspection will show it.

  4. Did it start after a specific event? A move, a software update, a dropped machine, or a crash mid-cut are all worth noting — they usually point straight at the cause.

  5. Do the cut keys turn in the lock but not start the vehicle? That is not a machine fault at all. See the note at the end of this article.

  6. Did it start after a software or database update? A calibration loop that begins right after an update is often a missing key blank in the database rather than a mechanical fault — the machine cannot find the blank profile and fails calibration repeatedly. Note which blank you were cutting when it started. 

Checks to run at the machine

Check 1 - Inspect the tracer 

A bent or damaged tracer is one of the most common causes of a machine cutting consistently off. It is visible on inspection and is a replaceable part.

  • Look along the tracer for any visible bend, chipping, or wear at the tip.

  • Compare it against a new tracer if you have one.

  • Check whether it moves freely and seats correctly.

  • If the tracer is bent, the machine will keep cutting to the same wrong dimension no matter how many times it is recalibrated.

Check 2 — Inspect the cutter wheel

A worn cutter produces cuts that are shallow, rough, or inconsistent in depth.

  • Look for visible wear, chipping, or glazing on the cutting edge.

  • Note roughly how many keys have been cut since the wheel was last changed.

  • Listen during a cut — a worn wheel often sounds different and cuts more slowly.

  • Unusual noises during a cut, or a machine that cuts standard keys but fails on high-security blanks, usually indicates a jaw or motor fault rather than a worn cutter. Note this when you report it. 

Check 3 — Check the clamp

If the blank is not held squarely, every cut is off regardless of the condition of the tracer and cutter.

  • Confirm the blank seats fully and squarely in the jaw.

  • Check the clamp for debris, brass shavings, or wear in the jaw faces.

  • Confirm the clamp tightens fully and the blank does not shift under light hand pressure.

  • Confirm you are using the correct clamp position or jaw for that blank type.

Check 4 — Consider calibration

Calibration drift usually shows as cuts that look correct and are close, but are not accepted by the lock.

  • Note when the machine was last calibrated.

  • Note whether the machine has been moved, knocked, or transported since.

  • If the tracer, cutter, and clamp all check out and cuts are consistently slightly off, calibration is the likely cause.

Calibration is normally corrected with the technical team on the line rather than independently, so record what you have found and move to reporting it.

Check 5 — Check the software and database versions

An out-of-date database shows as a specific vehicle or blank not being found, rather than as a cutting problem.

  • Open the machine's information or about screen.

  • Record both the software version and the database version.

  • Check whether an update is available and has not been applied.

Have both version numbers ready even if the fault appears mechanical — the technical team will ask for them either way.

What to gather before you report it

If the checks above do not resolve the fault, having the following ready means the first callback can be a diagnosis rather than a fact-finding call:

  • The machine model and serial number.

  • The software version and database version.

  • What you found in each of the checks above.

  • A description of the fault: what the machine does, at what point in the cut, and on which blanks.

  • Photos of the tracer, the cutter, and the clamp.

  • Whether the fault followed a move, an update, or a crash during a cut.

  • The site address and an on-site contact with a direct number, since machines are supported at the location they sit at rather than at the billing address.

Reporting the fault

  1. Submit a ticket through the AE Tools support ticket system with everything gathered above.

  2. State clearly if the machine is completely down and the site cannot cut keys at all, as that affects how the ticket is prioritized.

  3. Include the on-site contact name and direct number.

What happens next

The manufacturer's technical team will normally arrange to diagnose the machine remotely. This may involve reading the software and database versions, checking calibration, and stepping the on-site technician through test cuts. Have someone at the machine during the call who can operate it and handle parts.

Many faults are resolved at this stage with a calibration, a software or database update, or a replacement wear part shipped out to you.

Loaners

Where a machine has to leave the site, ask about a loaner when the ticket is opened rather than after the machine ships, so availability can be checked while the diagnosis is still in progress. Availability varies with what is in stock at the time, and the answer will be confirmed to you before the machine is collected.

Return shipping and RMA

  1. AE Tools will confirm the return process and issue a return shipping label.

  2. Machines are normally routed back through AE Tools first rather than shipped directly to the manufacturer, so use the label and address you are given rather than one from an earlier return.

  3. Pack the machine in its original packaging where you still have it. Key machines are precision equipment and calibration is affected by transit damage.

  4. Include the RMA reference with the shipment.

  5. Keep the tracking number and add it to the ticket.

If you manage several sites

Put each machine on its own ticket with its own serial number and site contact. Combining several machines into one ticket slows all of them down, because each is diagnosed separately.

Fleet and multi-site accounts with a machine down

If you manage several locations and a machine is completely down, contact your account management team rather than general support. A machine-down situation at a commercial account is handled through account management, who can arrange a replacement or expedite a unit.

When it isn't a machine fault

A correctly cut key will turn the lock but still not start the vehicle if it has not been programmed to the immobilizer. Cutting and programming are separate steps with separate causes. If the key turns but the vehicle does not start or recognize it, that is a diagnostic software and immobilizer question — see the relevant manufacturer key programming article and open a separate ticket.