Nearly every complaint about a plastic plate that 'warped' after machining is not a warping problem. It is a stress relief problem, and the material was already out of balance before the first cut.<\/p>\n\n
\u042d\u043a\u0441\u0442\u0440\u0443\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043b\u0438\u0441\u0442 \u043e\u0445\u043b\u0430\u0436\u0434\u0430\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043d\u0430\u0442\u044f\u0436\u0435\u043d\u0438\u0435\u043c. \u042d\u0442\u043e \u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0433\u0440\u0430\u0434\u0438\u0435\u043d\u0442 \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0439 \u043f\u043e \u0442\u043e\u043b\u0449\u0438\u043d\u0435, \u043f\u0440\u0438 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u043d\u0430\u0440\u0443\u0436\u043d\u044b\u0435 \u043f\u043e\u0432\u0435\u0440\u0445\u043d\u043e\u0441\u0442\u0438 \u043d\u0430\u0445\u043e\u0434\u044f\u0442\u0441\u044f \u0432 \u0438\u043d\u043e\u043c \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0438, \u0447\u0435\u043c \u0441\u0435\u0440\u0434\u0446\u0435\u0432\u0438\u043d\u0430. \u041e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u0443\u0434\u0430\u043b\u044f\u0435\u0442 \u043e\u0434\u043d\u0443 \u043f\u043e\u0432\u0435\u0440\u0445\u043d\u043e\u0441\u0442\u044c, \u0438 \u043e\u0441\u0442\u0430\u0432\u0448\u0438\u0439\u0441\u044f \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0442\u0435\u043f\u0435\u0440\u044c \u0440\u0430\u0437\u0431\u0430\u043b\u0430\u043d\u0441\u0438\u0440\u043e\u0432\u0430\u043d, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u043e\u043d \u0434\u0432\u0438\u0436\u0435\u0442\u0441\u044f \u043a \u043d\u043e\u0432\u043e\u043c\u0443 \u0440\u0430\u0432\u043d\u043e\u0432\u0435\u0441\u0438\u044e. \u0411\u043e\u043b\u0435\u0435 \u0442\u043e\u043d\u043a\u0438\u0435 \u0434\u0435\u0442\u0430\u043b\u0438 \u0434\u0432\u0438\u0433\u0430\u044e\u0442\u0441\u044f \u0441\u0438\u043b\u044c\u043d\u0435\u0435, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u043e\u0441\u0442\u0430\u0451\u0442\u0441\u044f \u043c\u0435\u043d\u044c\u0448\u0435 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u0430, \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u044f\u044e\u0449\u0435\u0433\u043e\u0441\u044f \u0440\u0430\u0437\u0431\u0430\u043b\u0430\u043d\u0441\u0443.<\/p>\n\n
\u041f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0441\u0440\u0435\u0434\u0441\u0442\u0432 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044f \u0442\u0440\u0438. \u041f\u043e\u043a\u0443\u043f\u0430\u0439\u0442\u0435 \u0431\u043e\u043b\u0435\u0435 \u0442\u043e\u043b\u0441\u0442\u0443\u044e \u0437\u0430\u0433\u043e\u0442\u043e\u0432\u043a\u0443 \u0438 \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0439\u0442\u0435 \u0434\u043e \u043d\u0443\u0436\u043d\u043e\u0433\u043e \u0440\u0430\u0437\u043c\u0435\u0440\u0430, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u043d\u0430\u0440\u0443\u0436\u043d\u044b\u0439 \u0441\u043b\u043e\u0439 \u2014 \u0442\u0430\u043c, \u0433\u0434\u0435 \u0433\u0440\u0430\u0434\u0438\u0435\u043d\u0442 \u0441\u0430\u043c\u044b\u0439 \u043a\u0440\u0443\u0442\u043e\u0439. \u0421\u043d\u0430\u0447\u0430\u043b\u0430 \u0447\u0435\u0440\u043d\u043e\u0432\u0430\u044f \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430, \u0441\u043d\u044f\u0442\u0438\u0435 \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0439 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0438\u0440\u0443\u0435\u043c\u044b\u043c \u0446\u0438\u043a\u043b\u043e\u043c \u043d\u0430\u0433\u0440\u0435\u0432\u0430, \u0437\u0430\u0442\u0435\u043c \u0447\u0438\u0441\u0442\u043e\u0432\u0430\u044f \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430. \u0418 \u0434\u043b\u044f \u0434\u0435\u0442\u0430\u043b\u0435\u0439, \u0433\u0434\u0435 \u043f\u043b\u043e\u0441\u043a\u043e\u0441\u0442\u043d\u043e\u0441\u0442\u044c \u043a\u0440\u0438\u0442\u0438\u0447\u043d\u0430, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0439\u0442\u0435 \u043b\u0438\u0442\u043e\u0439 \u0438\u043b\u0438 \u043f\u0440\u0435\u0441\u0441\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u0437\u0430\u043a\u0430\u043b\u0451\u043d\u043d\u044b\u0439 \u043b\u0438\u0441\u0442, \u0430 \u043d\u0435 \u044d\u043a\u0441\u0442\u0440\u0443\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439. \u0415\u0441\u043b\u0438 \u0432\u044b \u043d\u0430\u0431\u043b\u044e\u0434\u0430\u0435\u0442\u0435 \u0441\u043c\u0435\u0449\u0435\u043d\u0438\u0435 \u0438 \u043d\u0435 \u043c\u043e\u0436\u0435\u0442\u0435 \u0435\u0433\u043e \u043e\u0431\u044a\u044f\u0441\u043d\u0438\u0442\u044c, \u043f\u0440\u0438\u0448\u043b\u0438\u0442\u0435 \u043d\u0430\u043c \u0447\u0435\u0440\u0442\u0451\u0436 \u0438 \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439, \u0438 \u043c\u044b \u043e\u0431\u044b\u0447\u043d\u043e \u0441\u043c\u043e\u0436\u0435\u043c \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c, \u043a\u0430\u043a\u043e\u0439 \u044d\u0442\u0430\u043f \u0441\u043d\u0438\u043c\u0430\u0435\u0442 \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0435.<\/p>\n\n","protected":false},"excerpt":{"rendered":"
\u0412\u044b \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0438 \u043f\u043b\u043e\u0441\u043a\u0443\u044e \u043f\u043b\u0438\u0442\u0443, \u0438\u0437\u043c\u0435\u0440\u0438\u043b\u0438 \u0435\u0451, \u043e\u0442\u0433\u0440\u0443\u0437\u0438\u043b\u0438, \u0438 \u0437\u0430\u043a\u0430\u0437\u0447\u0438\u043a \u0433\u043e\u0432\u043e\u0440\u0438\u0442, \u0447\u0442\u043e \u043e\u043d\u0430 \u0432\u044b\u0433\u043d\u0443\u0442\u0430. \u041c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u043d\u0435 \u0438\u0437\u043c\u0435\u043d\u0438\u043b\u0441\u044f \u2014 \u0432\u044b \u0441\u043d\u044f\u043b\u0438 \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0435, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0443\u0436\u0435 \u0431\u044b\u043b\u043e \u0442\u0430\u043c.<\/p>\n","protected":false},"author":193679612,"featured_media":159,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","advanced_seo_description":"Why your part moved after machining, how stress gets into extruded sheet, the relief cycles that fix it, and what to specify on the drawing.","jetpack_seo_html_title":"Stress Relief in Extruded Plastic Sheet | Top Plastic","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_tp_seo_title":"Stress Relief in Extruded Plastic Sheet | Top Plastic","_tp_seo_desc":"Why your part moved after machining, how stress gets into extruded sheet, the relief cycles that fix it, and what to specify on the drawing.","_tp_summary":"","_tp_updated":"","_jetpack_feature_clip_id":0,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[132593],"tags":[132591],"class_list":["post-158","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-machining","tag-machining"],"jetpack_publicize_connections":[],"jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/pcp8Cz-2y","jetpack-related-posts":[{"id":560,"url":"https:\/\/cntopplastics.com\/ru\/warped-sheet-bowed-rod-causes\/","url_meta":{"origin":158,"position":0},"title":"Warped sheet and bowed rod: causes and how to prevent them","author":"jessemei","date":"2026-10-24","format":false,"excerpt":"Warping is rarely the material's fault. It is residual stress meeting an uneven thermal history. Where it starts in extrusion, annealing and machining.","rel":"","context":"\u0412 "Machining"","block_context":{"text":"Machining","link":"https:\/\/cntopplastics.com\/ru\/category\/machining\/"},"img":{"alt_text":"PPS 40% Glass Fibre Sheet","src":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/tp-pps-gf40.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/tp-pps-gf40.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/tp-pps-gf40.jpg?fit=1000%2C1000&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/tp-pps-gf40.jpg?fit=1000%2C1000&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":142,"url":"https:\/\/cntopplastics.com\/ru\/anneal-peek-machined-parts\/","url_meta":{"origin":158,"position":1},"title":"\u041f\u043e\u0447\u0435\u043c\u0443 \u043c\u044b \u043e\u0442\u0436\u0438\u0433\u0430\u0435\u043c PEEK \u043f\u0435\u0440\u0435\u0434 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0438 \u0447\u0442\u043e \u0431\u0443\u0434\u0435\u0442, \u0435\u0441\u043b\u0438 \u044d\u0442\u043e\u0433\u043e \u043d\u0435 \u0441\u0434\u0435\u043b\u0430\u0442\u044c","author":"jessemei","date":"2026-04-23","format":false,"excerpt":"Extruded PEEK carries locked-in stress from the extrusion process. Machine it out and the part will move. 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The cast material is not a downgrade \u2014 on large-diameter parts it is usually the better buy.","rel":"","context":"\u0412 "Material Guide"","block_context":{"text":"Material Guide","link":"https:\/\/cntopplastics.com\/ru\/category\/material-guide\/"},"img":{"alt_text":"PA66 extruded rod or cast MC nylon? 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The difference shows up in the middle of a bore and at the end of a long run.","rel":"","context":"\u0412 "Material Guide"","block_context":{"text":"Material Guide","link":"https:\/\/cntopplastics.com\/ru\/category\/material-guide\/"},"img":{"alt_text":"POM-C or POM-H? A practical comparison for machined parts","src":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-pom-c-vs-pom-h.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-pom-c-vs-pom-h.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-pom-c-vs-pom-h.jpg?fit=1000%2C1000&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-pom-c-vs-pom-h.jpg?fit=1000%2C1000&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":507,"url":"https:\/\/cntopplastics.com\/ru\/tapping-threading-engineering-plastics\/","url_meta":{"origin":158,"position":5},"title":"Tapping threads in plastics: pitch, pilot size and inserts","author":"jessemei","date":"2026-10-19","format":false,"excerpt":"Tapping plastic is not tapping steel. Coarse pitch, correct pilot size and the right insert decide whether the thread strips. What to check at assembly.","rel":"","context":"\u0412 "Machining"","block_context":{"text":"Machining","link":"https:\/\/cntopplastics.com\/ru\/category\/machining\/"},"img":{"alt_text":"PA66 Extruded Natural Rod","src":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/tp-pa66-nat.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/tp-pa66-nat.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/tp-pa66-nat.jpg?fit=1000%2C1000&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/tp-pa66-nat.jpg?fit=1000%2C1000&ssl=1&resize=700%2C400 2x"},"classes":[]}],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-stress-relief-sheet.jpg?fit=1000%2C1000&ssl=1","_links":{"self":[{"href":"https:\/\/cntopplastics.com\/ru\/wp-json\/wp\/v2\/posts\/158","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cntopplastics.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cntopplastics.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cntopplastics.com\/ru\/wp-json\/wp\/v2\/users\/193679612"}],"replies":[{"embeddable":true,"href":"https:\/\/cntopplastics.com\/ru\/wp-json\/wp\/v2\/comments?post=158"}],"version-history":[{"count":3,"href":"https:\/\/cntopplastics.com\/ru\/wp-json\/wp\/v2\/posts\/158\/revisions"}],"predecessor-version":[{"id":495,"href":"https:\/\/cntopplastics.com\/ru\/wp-json\/wp\/v2\/posts\/158\/revisions\/495"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cntopplastics.com\/ru\/wp-json\/wp\/v2\/media\/159"}],"wp:attachment":[{"href":"https:\/\/cntopplastics.com\/ru\/wp-json\/wp\/v2\/media?parent=158"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cntopplastics.com\/ru\/wp-json\/wp\/v2\/categories?post=158"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cntopplastics.com\/ru\/wp-json\/wp\/v2\/tags?post=158"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}