{"id":815,"date":"2022-06-08T17:42:27","date_gmt":"2022-06-08T09:42:27","guid":{"rendered":"http:\/\/www.ling-jin.cn\/?p=815"},"modified":"2022-06-08T17:42:27","modified_gmt":"2022-06-08T09:42:27","slug":"machining-scheme-of-holes-with-different-accuracy","status":"publish","type":"post","link":"https:\/\/www.findtop.com\/machining-scheme-of-holes-with-different-accuracy\/","title":{"rendered":"Machining scheme of holes with different accuracy","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Recently, I saw some social friends asking about the processing method of holes. I saw that this information is better. I can share it with you for common progress.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cylindrical hole machining with different precision and different blank:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img data-recalc-dims=\"1\" fetchpriority=\"high\" decoding=\"async\" width=\"640\" height=\"885\" src=\"https:\/\/i0.wp.com\/www.ling-jin.cn\/wp-content\/uploads\/2022\/06\/image-249.png?resize=640%2C885\" alt=\"\" class=\"wp-image-817\" srcset=\"https:\/\/i0.wp.com\/www.findtop.com\/wp-content\/uploads\/2022\/06\/image-249.png?w=664&amp;ssl=1 664w, https:\/\/i0.wp.com\/www.findtop.com\/wp-content\/uploads\/2022\/06\/image-249.png?resize=217%2C300&amp;ssl=1 217w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Example: hole \u03a6 25 (0, +0.033), tolerance H8, fried dough twist to hole. \u03a6 24.8 ream to \u03a6 25 (0, + 0.033) holes \u03a6 35 (0, +0.062), hole tolerance H7, fried dough twist drill. \u03a6 34.8, ream to \u03a6 35\uff080\uff0c+0.062\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u03a6 8 (0, +0.018), hole tolerance is about H7-H8, center drill positioning, fried dough twist to \u03a6 6. Rough boring to \u03a6 7.5\uff0c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1. When drilling a hole with a larger diameter (greater than 30mm), it is not suitable to drill it with a large drill at one time. It is best to drill it multiple times, that is, drill with a smaller diameter drill first, and then expand it to the required size with a larger diameter drill.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The hole selected as the base hole is called the reference hole, and the reference hole is numbered H (the lower deviation value is 0 and the upper deviation value is positive)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The axis selected as the datum in the base axis system is called the datum axis, and the datum axis code is h (the upper deviation value is 0, and the lower deviation value is negative)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cylindrical surface machining:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ling-jin.cn\/wp-content\/uploads\/2022\/06\/image-251.png?resize=640%2C287\" alt=\"\" class=\"wp-image-819\" width=\"640\" height=\"287\" srcset=\"https:\/\/i0.wp.com\/www.findtop.com\/wp-content\/uploads\/2022\/06\/image-251.png?w=670&amp;ssl=1 670w, https:\/\/i0.wp.com\/www.findtop.com\/wp-content\/uploads\/2022\/06\/image-251.png?resize=300%2C135&amp;ssl=1 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n<\/div>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>Recently, I saw some social friends asking about the processing method of holes. I saw that this information is better. I can share it with you for common progress. Cylindrical hole machining with different precision and different blank: Example: hole \u03a6 25 (0, +0.033), tolerance H8, fried dough twist to hole. \u03a6 24.8 ream to [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":2,"featured_media":816,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[7],"tags":[],"class_list":["post-815","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-custom-manufacturing-b2b-technology-knowledge"],"jetpack_publicize_connections":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.1 (Yoast SEO v24.1) - 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