{"id":1363,"date":"2026-09-11T06:59:49","date_gmt":"2026-09-11T06:59:49","guid":{"rendered":"https:\/\/injection-molded-parts.com\/secondary-machining-molded-plastic-gears\/"},"modified":"2026-09-14T03:15:02","modified_gmt":"2026-09-14T03:15:02","slug":"secondary-machining-molded-plastic-gears","status":"publish","type":"post","link":"https:\/\/injection-molded-parts.com\/pl\/secondary-machining-molded-plastic-gears\/","title":{"rendered":"Secondary Machining of Molded Plastic Gears"},"content":{"rendered":"
\n

Engineering context<\/h2>\n

Secondary machining can refine bores, faces or datums after molding when the assembly needs a relationship that is difficult to hold directly from the tool.<\/p>\n

The benefit must be weighed against extra handling, fixturing and the possibility of releasing molded-in stress. Machining also changes the datum chain if the gear tooth form remains as molded.<\/p>\n

Secondary machining is most valuable when it controls a specific relationship that the molding process cannot hold economically. Typical candidates are precision bores, bearing seats or mounting faces. If the gear is fixtured from a cosmetic outer surface, however, machining may introduce a new eccentricity. The fixture should locate from a stable molded datum that has a known relationship to the teeth.<\/p>\n<\/section>\n

\"Secondary<\/figure>\n
\n

What the drawing needs to communicate<\/h2>\n

Identify exactly which feature is machined, which molded surface locates the part in the fixture and which dimensions are inspected afterward.<\/p>\n

W miar\u0119 mo\u017cliwo\u015bci umieszczaj te dane wej\u015bciowe na rysunku kontrolnym, specyfikacji lub za\u0142\u0105czniku do zapytania ofertowego (RFQ). Nie umieszczaj ich w nieformalnych w\u0105tkach wiadomo\u015bci, co u\u0142atwia zarz\u0105dzanie por\u00f3wnaniami dostawc\u00f3w i p\u00f3\u017aniejszymi poprawkami.<\/p>\n<\/section>\n

\n

Risk review<\/h2>\n

Adding a machined bore without a coherent tooth-to-bore datum can improve diameter size but not runout.<\/p>\n<\/section>\n

\"Secondary<\/figure>\n
\n

Sample acceptance<\/h2>\n

Use a fixture and inspection plan that references the functional gear datum structure.<\/p>\n

For Secondary Machining of Molded Plastic Gears, close the DFM loop by updating the controlled CAD\/drawing and sample plan. A recommendation that never reaches the released revision cannot be inspected consistently in production.<\/p>\n<\/section>\n

\"Secondary<\/figure>\n
\n

From design review to RFQ<\/h2>\n

Before requesting a price for secondary machining of molded plastic gears, identify the current drawing revision, production quantity, material constraint and the feature that most strongly affects function. Ask the supplier to flag any deviation from those inputs in the quotation so technical alternatives stay visible.<\/p>\n<\/section>\n

\n

Praktyczny przegl\u0105d projektu dla tej decyzji<\/h2>\n

Secondary machining can improve a final bore, datum, face or thread, but it changes the process chain. Define the datum used to locate the molded part, expected stock allowance, clamping method and how the machined feature relates to the gear teeth or molded interface.<\/p>\n

Zapisz za\u0142o\u017cenia na rysunku lub w zapytaniu ofertowym (RFQ), aby dostawca m\u00f3g\u0142 je potwierdzi\u0107 przed z\u0142o\u017ceniem oferty. Je\u015bli warto\u015b\u0107 jest nieznana, oznacz j\u0105 jako element in\u017cynieryjny, zamiast kopiowa\u0107 og\u00f3lny numer katalogowy, kt\u00f3ry mo\u017ce nie pasowa\u0107 do zestawu.<\/p>\n<\/section>\n

\n

Arkusz weryfikacyjny<\/h2>\n
    \n
  • Molded datum used for setup<\/li>\n
  • Stock allowance<\/li>\n
  • Machined feature tolerance<\/li>\n
  • Clamp distortion risk<\/li>\n
  • Burr \/ stress \/ surface requirement<\/li>\n
  • Final inspection after machining<\/li>\n<\/ul>\n

    U\u017cyj pierwszej pr\u00f3bki, aby zamkn\u0105\u0107 te punkty, zar\u00f3wno pod wzgl\u0119dem wymiarowym, jak i odpowiedniej kontroli funkcjonalnej. Wszelkie akceptowane odchylenia powinny zosta\u0107 odnotowane podczas kontroli przed powt\u00f3rn\u0105 produkcj\u0105.<\/p>\n<\/section>","protected":false},"excerpt":{"rendered":"

    Engineering context Secondary machining can refine bores, faces or datums after molding when the assembly needs a relationship that is difficult to hold directly from the tool. The benefit must be weighed against extra handling,…<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1363","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/injection-molded-parts.com\/pl\/wp-json\/wp\/v2\/posts\/1363","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/injection-molded-parts.com\/pl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/injection-molded-parts.com\/pl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/injection-molded-parts.com\/pl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/injection-molded-parts.com\/pl\/wp-json\/wp\/v2\/comments?post=1363"}],"version-history":[{"count":2,"href":"https:\/\/injection-molded-parts.com\/pl\/wp-json\/wp\/v2\/posts\/1363\/revisions"}],"predecessor-version":[{"id":1608,"href":"https:\/\/injection-molded-parts.com\/pl\/wp-json\/wp\/v2\/posts\/1363\/revisions\/1608"}],"wp:attachment":[{"href":"https:\/\/injection-molded-parts.com\/pl\/wp-json\/wp\/v2\/media?parent=1363"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/injection-molded-parts.com\/pl\/wp-json\/wp\/v2\/categories?post=1363"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/injection-molded-parts.com\/pl\/wp-json\/wp\/v2\/tags?post=1363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}