久久丫精品久久丫_妖精色AV无码国产在线看_少妇中文字幕乱码亚洲影视_中文字幕AV一区中文字幕天堂

Your location: -En-News-

Service Hotline

+86-15092504545

Drilling skills and process

Author:山東精鉆精密機(jī)械有限公司 Source:http://www.qivvc.com Time:2021-05-07
  Polishing skills and process of easy-to-use drills:
  
 ?、貰asic points:
  
  (1) The grinding wheel should rotate smoothly
  
  (2) The circumference should be flat
  
  (3) Large amount of runout must be trimmed
  
  ②Specific method: When the outer edge of the drill bit wears out, the edge that has become blunt should be worn away, otherwise the sticking and noise will occur. The pressure during sharpening should not be too high, and often dipped in water for cooling to prevent overheating annealing and reducing the hardness. After sharpening, the test can be tested with a sample, but the method of visual inspection is often used. Erect the cutting part of the drill bit upright and look at it with both eyes. Since the two main cutting edges are one behind the other, there will be parallax. It is often felt that the two cutting edges are one high and one low. Rotate 180 degrees and look at it several times. As the result shows, it is symmetrical. The same is true for the rear angle, just look at the same angle of inclination.

亚洲精品污一区二区三区 | 亚洲AV无码国产丝袜综合桃花林 | 小寡妇高潮流白浆A片小说 国产做a爰片毛片A片美国 | 国产人成一区二区三区影院 | 西西中文字幕无码在线播放 | 果冻传媒AV在线观看入口 | 成年美女黄又污网站色大免费全看 | 国产suv精品一区二区33 | 少妇精品无码一区二区三区大长今 | 国产高清一区三级片 | 日产国产亚洲A片无 9 8码小说 | 又大又猛又黄又硬又爆又粗的视频 | 久激情内射婷内射蜜桃欧美一级 | 最近国产高清免费在线观看 | 国产精品 色哟哟 | 樱花视频A片成人免费播放 国产亚洲人成a在线v网站 | 国产乱妇高清无码 | 中文字幕在线不卡 | 黄色视频成年人在线观看 | 强奸乱伦福利导航 | 国产熟妇无码A片AAA毛片视频 | 中文字幕一区二区三区在线手机 | 一本精品无码不卡 | 亚洲欧洲囯产一区二区三区 | www.无码视频| 91午夜福利视频 | 艳妇臀荡乳欲伦交换在线播放 | 人人妻人人澡人人爽人人蜜桃 | 国产精品久久久久久久久18美女禁 | 无码人妻丰满熟妇一区二区三区 | 亚洲AV无码一区二区二三区公司 | 超级,亚洲免费,蜜桃,av, | 又粗又大中文字幕 | 成片免费观看视频大全 | 无码人妻aⅴ一区二区三区麻豆 | 中文字幕一区二区三区乱码图片 | 园产精品久久久久无码 | 九七精品熟女少妇一区二区三区 | 亚洲爆乳一区二区三区男人吃奶 | 日韩人妻中文视频 | 国产精品一区二区无线 |