Knowledge

6. Repeatable indexing accuracy test of rotary table The measurement method is to repeat positioning 3 times at any three positions within one week of the rotary table, and test in

11. Necessary conditions for forming dynamic pressure oil film (1) There must be a wedge-shaped gap between the two working surfaces. (2) The space between the two working surfaces

6. Advantages and Disadvantages of Belt Drives Advantages: (1) Suitable for transmission with large center distance. (2) The belt has good flexibility, which can alleviate impact a

1. What are the reasons and measures for preventing threaded connections from loosening? Reason: Under the action of impact, vibration and load change, the pretightening force of t

When CNC lathes process threads, due to changes in the transmission chain, in principle, the speed should only be able to ensure that the tool displaces one pitch along the main fe

1. What are the three methods of clamping workpieces? {1. Clamp in the fixture; 2. Find the correct clamp directly; 3. Mark the line and find the correct clamp} 2. What does the pr

Positioning accuracy and repeat positioning accuracy are two different concepts Commonly used in industry to describe the performance of mechanical systems. Repeat positioning accu

QC Quality Control, quality control, product quality inspection, analysis and improvement after quality problems are discovered, and the general term for the personnel involved in

1. The numerical relationship between dimensional tolerance, geometric tolerance and surface roughness: 1. Numerical relationship between shape tolerance and dimensional tolerance

BSPT and BSP British Specification Taper Threads NPT US specification taper thread PT Japan's old JIS standard taper thread, equivalent to ISO standard R, Rc DIN2999 European,

Die casting is a process of metal smelting and processing. It is a casting method in which molten alloy liquid is filled into the cavity of a steel mold at high speed under the act

Aluminum alloy die-casting is a common manufacturing technology that produces many of the products we use every day. However, this processing technique can also cause harm to the e