What should I pay attention to when purchasing a second-hand diamond drilling machine?

When purchasing a second-hand drilling machine, it is necessary to consider multiple aspects such as the condition of the equipment itself, relevant documents and procedures, and after-sales service. The following are specific issues to be noted:

1、 Equipment condition

Appearance and mechanical structure: Carefully inspect the body for deformation, cracks, severe corrosion, and ensure that protective doors, sheet metal parts, etc. are intact. Check the wear of key transmission components such as guide rails and screw rods. If there are severe wear, scratches, strains, etc., it will affect the machining accuracy and equipment life. It is also necessary to check whether the workbench is flat, free from bumps, scratches, deformations, etc., which will directly affect the clamping and processing quality of the workpiece.

Electrical system: Check the electrical components inside the electrical cabinet for signs of aging, damage, or burning, and for any safety hazards such as damaged or exposed wires. Test the control system of the equipment, check whether the buttons and knobs on the operation panel are sensitive and effective, whether the display screen is displaying normally, and whether the system has alarm information.

Spindle system: Start the spindle and listen for a smooth and even running sound, as well as any abnormal noise or vibration. By touching the spindle housing with your hand, you can feel if the temperature is too high and check the accuracy of the spindle, such as radial runout and axial displacement. Generally, tools such as a dial gauge can be used for detection. If the accuracy deviation is too large, it will affect the machining accuracy.

Tool system: Check whether the tool changing action of the tool magazine is accurate and smooth, and whether there are any stuck or dropped tools. Check the degree of tool wear, and if the tool is severely worn, consider the cost of replacement. It is also necessary to confirm the accuracy of the fit between the tool holder and the spindle. If the fit is not good, it will affect the clamping accuracy and machining stability of the tool.

2、 Information and procedures

Equipment information: The seller is required to provide the original factory manual, operation manual, maintenance manual, etc. of the equipment, which are very important for the operation, maintenance, and troubleshooting of the equipment. It is also necessary to check the accuracy inspection report, factory certificate and other quality certification documents of the equipment to understand the accuracy and quality status of the equipment when it leaves the factory.

Legal procedures: Ensure that the source of the equipment is legal, require the seller to provide purchase invoices, proof of ownership, etc., to avoid purchasing equipment with unknown sources or legal disputes. For imported equipment, it is necessary to check whether the import customs declaration form, proof of tariff payment, and other procedures are complete to prevent equipment from being unable to be used or transferred due to procedural issues.

3、 Trading and after-sales service

Price and Contract: Before purchasing, conduct market research, consult peers, and other methods to understand the market price of second-hand drilling machines of the same model and service life, in order to avoid buying at a high price. Sign a detailed purchase contract, specifying the model, specifications, quantity, price, delivery time, quality standards, after-sales service, and other terms of the equipment, as well as the rights and obligations of both parties. If necessary, consult a lawyer or professional.

After sales service: Understand whether the seller provides after-sales service, such as equipment installation and commissioning, training, maintenance during the warranty period, etc. Inquire about the seller's repair response time and repair capability to ensure timely repair in case of equipment failure. The seller can also be requested to provide a certain period of warranty service, clarifying the scope of warranty and maintenance responsibilities during the warranty period.