How to buy a used cylindrical grinder？

Choosing a used cylindrical grinder is a process that requires comprehensive consideration of many factors. Here are some detailed suggestions for buying:
I. understand the market and brand
1. Market situation:
    Prior understanding of the overall situation of the market for used cylindrical grinders, including price ranges, popular brands, common models and so on.
2. Brand selection:
   Choose high-profile, well-reputed brands, such as Italy's Favretto, Japan's Tokyo Seiki, Germany's SCHNEEBERGER and so on. The products of these brands usually have high performance and quality assurance.
II. clear needs and budget
1. Machining needs:
   According to the material, shape and size of the workpiece, as well as the expected grinding accuracy and productivity and other factors, to determine the required grinding machine models and specifications.
2. Budget formulation:
   According to your economic strength and processing needs, set a reasonable budget. The price will be affected by a variety of factors such as brand, performance, service life, etc. Do not blindly pursue a low price and ignore the performance and quality of the equipment.
III. check the performance and quality of equipment
1. Appearance check:
   Observe whether the appearance of the equipment is neat, there is no damage, fading, rust and other phenomena. Check whether the parts are intact, complete or not. 2.
2. Accuracy inspection:
   Use micrometers and other measuring tools to test the grinding accuracy of the grinder, generally require an accuracy of 0.005mm or less. Higher precision equipment performance is more stable.
3. spindle speed
   Detect the spindle speed, higher spindle speed can improve the grinding efficiency and surface quality.
4. grinding capacity:
   Observe whether the grinding capacity of the equipment meets the demand, including the grinding effect of rough grinding and fine grinding.
5. Stability:
   Check the stability of the equipment during operation, including the stability of the bed and table, and the wear of the grinding wheel holder.
IV. consider the after-sales service
1. Repair and maintenance:
   Understand the repair and maintenance of the equipment, and choose those products that have been well maintained and are in good operating condition. At the same time, ask the seller whether to provide follow-up repair and maintenance services.
2. technical support:
   If possible, choose those sellers or dealers who provide technical support so that problems encountered during the use of equipment can be resolved in a timely manner.
V. Other considerations
1. Know the seller's reputation:
   If you are buying from an individual or a small business, make sure you know the seller's reputation and word of mouth to avoid buying unreliable equipment.
2. Sign a contract:
    Before purchasing, sign a detailed purchase contract with the seller, specifying the model, specification, price and after-sales service of the equipment to protect your legitimate rights and interests.
3. Field trial:
   If the conditions allow, it is best to field test and observe the operation of the equipment. Through the test machine can be more intuitive understanding of the performance and quality of the equipment.
In summary, the purchase of used cylindrical grinding machine need to consider the brand, demand, budget, performance, quality and after-sales service and other aspects. Only a comprehensive understanding and comparison of the advantages and disadvantages of different products, in order to buy a cost-effective equipment that meets their needs.