Prepare an inspection brief
Start with the parts you intend to make: material, dimensions, tolerances, operations and expected workholding. Give the inspector the advertised sheet and a list of essential options. Ask a qualified machine-tool technician to agree safe test methods with the seller; this is a procurement checklist, not a procedure for operating or opening a machine.
Match the machine to the listing
Record the complete model and serial number from the nameplate. Distinguish manufacture year from installation year and ask for evidence where either is missing. Compare control, spindle, tool magazine, feeder, probes and auxiliary equipment with the written quotation. A photo of an accessory elsewhere in a workshop does not establish that it is included.
Request evidence under agreed conditions
Ask for current videos showing the machine identity and the agreed spindle, axis, tool-change and auxiliary functions. Have a technician assess alarms, lubrication, leaks, unusual noise and signs of damage using appropriate procedures. Do not bypass guards or interlocks to obtain a video. A short demonstration does not establish accuracy throughout the working envelope or guarantee future reliability.
Make the test specific to the machine type
For a Swiss-type lathe, address the guide bushing, main/sub-spindle operations, feeder and supplied live tooling. For a 5-axis machining center, confirm the fitted control options, rotary-axis operation and usable fixture envelope. For a gantry machine, include table condition, the quoted heads, site dimensions and the dismantling plan. Choose an agreed test piece or documented measurement method rather than accepting a general claim of high precision.
Close with a written acceptance record
Record the test conditions, instruments, observed results, unresolved items and included accessories. Agree how discrepancies will be handled before shipment. Ask for relevant manuals, available maintenance records and the scope of any backup or software transfer. If the machine cannot be demonstrated, identify that limitation in the buying decision. Send TIANSEN CNC your inspection requirements with the model name so the arrangements can be discussed before travel or payment.
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