电脑桌面
添加小米粒文库到电脑桌面
安装后可以在桌面快捷访问

机械工程专业英语第四课文及阅读材料

机械工程专业英语第四课文及阅读材料_第1页
1/12
机械工程专业英语第四课文及阅读材料_第2页
2/12
机械工程专业英语第四课文及阅读材料_第3页
3/12
Lesson 5 lathe, shaper, grinding and milling machine 1, lathes and lathe operations Lathes are generally considered to be the oldest machine tools . although woodworking lathes were originally developed during the period 1000-1 B.C., metalworking lathes with lead screws were not built until the late 1700s .the most common lathe (figure 2.1) was originally called engine lathe because it was powered with overhead pulleys and belts from nearby engines . today these lathes are set up with individual electric motors. 1) Lathe components Lathes are equipped with a variety of components and accessories . the basic components of a common lathe are described below. i) Bed The bed supports all major components of the lathe. Beds have a large mass and are rigidly built ,usually from gray or nodular cast iron . the top portion of the bed has two ways , with various cross-sections ,that are hardened and machined for wear resistance and dimensional accuracy during use . ii) Carriage The carriage ,or carriage assembly ,slides along the ways and consists of an assembly of the cross-slide , tool post ,and apron .the cutting tool is mounted on the tool post ,usually with a compound rest that swivels for tool positioning and adjustment . the cross-slide moves radially in and out ,controlling the radial position of the cutting tool in operations such as facing. The apron is equipped with mechanisms for both manual and mechanized movement of the carriage and the cross-slide by means of the lead screw . iii) Headstock The headstock is fixed to the bed and is equipped with motors , pulleys , and V-belts that supply power to the spindle at various rotational speeds . the speeds can be set through manually...

1、当您付费下载文档后,您只拥有了使用权限,并不意味着购买了版权,文档只能用于自身使用,不得用于其他商业用途(如 [转卖]进行直接盈利或[编辑后售卖]进行间接盈利)。
2、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。
3、如文档内容存在违规,或者侵犯商业秘密、侵犯著作权等,请点击“违规举报”。

碎片内容

机械工程专业英语第四课文及阅读材料

确认删除?
VIP
微信客服
  • 扫码咨询
会员Q群
  • 会员专属群点击这里加入QQ群
客服邮箱
回到顶部