CNC software and backups: agree what can transfer to a buyer
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Do not assume that everything stored on a CNC machine belongs in its sale. Machine configuration data, customer programs, business accounts and software licences raise different questions. The physical machine changing hands does not answer all of them.
Make the digital handover a named part of the sale preparation, with someone responsible for obtaining the relevant answers. Leaving it until collection day can put both the machine's usability and confidential information at risk.
Start with the data categories
A backup is not necessarily a single collection of customer programs. Haas's NGC backup guidance distinguishes categories of machine information, including system data and user data. The precise content and procedure depend on the control and software version.
That distinction matters before anybody decides what to retain, transfer or remove. Have a competent person identify the machine-specific information needed for the agreed handover. Do not improvise deletion, restoration or parameter changes during catalogue preparation.
Keep the control identification and support enquiry alongside the digital register. The manufacturer or service provider needs to know which machine and software version the enquiry concerns.
Use a handover register
The following example separates questions that are often hidden inside “software included”.
| Item | What to establish | Person or organisation to ask | Agreed outcome |
|---|---|---|---|
| Machine configuration data | What belongs to this machine and is needed for the handover | Manufacturer or competent service provider | Record the agreed scope |
| Customer part programs | Ownership, confidentiality and any release permission | Business owner and relevant customer contact | Transfer, retain or specialist review |
| External CAM software | Product, version, licence holder and transfer terms | Software supplier or rights holder | Written confirmation required |
| Licensed machine option | Current entitlement and transfer position | Manufacturer or authorised supplier | Confirmed status for this machine |
| Programming computer | Included hardware and treatment of stored business data | Owner and competent IT support | Documented handover plan |
| Service or cloud account | Account holder and permitted change of access | Service provider | Provider-approved process |
Add a document reference and decision date to each row. Do not place passwords or confidential file contents in the public inventory.
Ask about rights before making the catalogue promise
There is a difference between moving software to another computer and transferring its use to another business. Ask the supplier the question that matches the proposed sale, identifying the licence and the parties where appropriate.
Avoid inferring permission from the fact that the software opens, a dongle is present or the original invoice exists. Those facts can help identify the arrangement; they do not answer every transfer question.
If the position remains unresolved, state that clearly in the sale scope. A buyer should know whether software rights are included, excluded or awaiting confirmation before relying on the package.
For a coordinate measuring machine, the measurement software and controller may have their own dependencies. For rotary tables and probing systems, keep the hardware inventory separate from any related licensed functions.
Preserve the evidence without exposing it
The sale file should show that the handover has been considered. It does not need to contain public copies of customer programs, credentials or complete internal backups.
Agree where restricted records will be held and who can access them. Use an approved process for any buyer or specialist who needs to assess the information. Redacted evidence may be sufficient for the catalogue while fuller records remain available through the agreed channel.
The PLC and industrial-software guide applies the same ownership questions to production-line controls. It should not be used as a substitute for the machine manufacturer's technical guidance.
Before final catalogue approval, compare the digital register with the written inclusion list. Resolve any contradiction between “computer included”, “software excluded” and photographs that could suggest otherwise.
Contact UK Auction Group with the agreed scope and any outstanding transfer questions. That allows the sale description to reflect the package you are actually able to offer.
The engineering and CNC hub connects the related hardware and condition guides.
Sources
This guide gives general information. Equipment-specific, legal, tax and safety decisions may need a qualified adviser or competent specialist. The guides do not promise sale prices, fees or results.