{"id":9360,"date":"2024-01-17T01:00:00","date_gmt":"2024-01-17T01:00:00","guid":{"rendered":"https:\/\/uplastech.com\/thermoformed-part-first-article-gauge-rr\/"},"modified":"2026-11-08T08:12:37","modified_gmt":"2026-11-08T08:12:37","slug":"thermoformed-part-first-article-gauge-rr","status":"publish","type":"post","link":"https:\/\/uplastech.com\/de\/thermoformed-part-first-article-gauge-rr\/","title":{"rendered":"Gauge R&#038;R on the First Article: When Buyer and Supplier Disagree on 0.5 mm"},"content":{"rendered":"<style>\n.upl-blog{font-size:17px;line-height:1.78;color:#1f2937}\n.upl-blog p{margin:0 0 18px}\n.upl-blog h2{font-size:26px;line-height:1.3;color:#0b2b33;margin:46px 0 14px;font-weight:700;letter-spacing:-.015em}\n.upl-blog h3{font-size:19.5px;color:#0d3b47;margin:28px 0 10px;font-weight:700}\n.upl-blog ul,.upl-blog ol{margin:0 0 20px;padding-left:22px}\n.upl-blog li{margin:0 0 9px}\n.upl-blog figure{margin:0 0 34px}\n.upl-blog figure 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ul.cta-need li{color:#e4f0f2;font-size:14.5px;padding-left:18px;position:relative;margin:0}\n.upl-blog ul.cta-need li::before{content:\"\\2713\";position:absolute;left:0;color:#e07a1f;font-weight:700}\n\/* ==UPL-CONVERSION-MODULES-END== *\/\n@media(max-width:640px){.upl-blog h2{font-size:22px}.upl-blog table{font-size:13px}.upl-blog .cta{padding:24px}.upl-blog ul.conv-need,.upl-blog ul.cta-need{grid-template-columns:1fr}.upl-blog .problem,.upl-blog .steps,.upl-blog .conv,.upl-blog .checklist{padding:18px}}\n\/* \u5355\u7bc7\u9875\u9690\u85cf WhatsApp \u95ee\u5019\u5361\uff0c\u53ea\u4fdd\u7559\u5706\u5f62\u6c14\u6ce1\uff0c\u907f\u514d\u906e\u6321\u4fa7\u680f\u8be2\u76d8\u63d0\u4ea4\u6309\u94ae\u3002\n   \u6ce8\u610f\uff1aClick to Chat \u7684\u70b9\u51fb\u903b\u8f91\u662f\u300c\u95ee\u5019\u5361\u5143\u7d20\u5b58\u5728\u5c31\u4e0d\u8df3\u8f6c\u300d\uff0c\u53ea\u9760 CSS \u9690\u85cf\u4f1a\u8ba9\u6c14\u6ce1\u53d8\u6210\u6b7b\u94fe\u63a5\u3002\n   Code Snippets #9\u300cUPL single post: WhatsApp bubble jumps straight to chat\u300d\u8d1f\u8d23\u628a\u8be5\u8282\u70b9\u4ece DOM \u79fb\u9664\uff0c\n   \u4e0b\u9762\u8fd9\u6761 CSS \u53ea\u662f\u79fb\u9664\u524d\u7684\u89c6\u89c9\u515c\u5e95\u3002\u5220 #9 \u524d\u5fc5\u987b\u5148\u5220\u8fd9\u6761\u89c4\u5219\u3002 *\/\nbody.single-post .ht_ctc_chat_greetings_box{display:none !important}\n<\/style>\n<div class=\"upl-blog\">\n<figure>\n<img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/uplastech.com\/wp-content\/uploads\/2026\/11\/2024-thermoformed-part-first-article-gauge-rr-hero.jpg\" alt=\"Real thermoformed plastic tray and packaging components\" width=\"1536\" height=\"909\"><figcaption>Real thermoforming production context. Photo: Pexels.<\/figcaption><\/figure>\n<div class=\"problem\">\n<p class=\"mod-h\">The problem<\/p>\n<p><b>Symptom.<\/b> A buyer reads the 180.0 mm flange of a formed tray at 179.55 mm and the supplier reads 180.05 mm, a 0.50 mm gap on a +\/-0.4 mm tolerance, so first-article approval stalls.<\/p>\n<p><b>What it costs.<\/b> A 90 000-part first-article lot cannot be released, and both sides defend their own calliper reading while the real fault sits in two different fixtures and no agreed datum.<\/p>\n<p class=\"problem-promise\">This guide shows how to run a gauge R&R study, define a 3-2-1 datum and fixture, and write a measurement method into the tray drawing.<\/p>\n<\/div>\n<div class=\"toc\"><\/div>\n<h2 id=\"the-disagreement-is-a-measurement-system-fault-not-a-part-fault\">The disagreement is a measurement-system fault, not a part fault<\/h2>\n<p>A dimensional disagreement is usually a measurement-system problem. A 0.50 mm spread between buyer and supplier on a 0.80 mm tolerance band consumes 0.50 \/ 0.80 = 62.5 % of the band before any part variation is considered.<\/p>\n<table>\n<thead>\n<tr>\n<th>What each side reports<\/th>\n<th>What is physically happening<\/th>\n<th>First measurement<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Buyer and supplier differ by 0.50 mm<\/td>\n<td>Two fixtures reference different datums<\/td>\n<td>Gauge R&R with 10 parts, 3 operators, 3 repeats<\/td>\n<\/tr>\n<tr>\n<td>Reading drifts with the operator<\/td>\n<td>Hand-held calliper angle and force vary<\/td>\n<td>Repeatability from the R&R study<\/td>\n<\/tr>\n<tr>\n<td>Good at 20 \u00b0C, bad in a warm store<\/td>\n<td>Calliper and tray expand with temperature<\/td>\n<td>Reading at 20 \u00b0C and 30 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>One corner of the flange worse<\/td>\n<td>Warped nest lifts a datum pad<\/td>\n<td>Flatness of the three locating pads<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 1 - Classifying a measurement disagreement before re-cutting the tool<\/p>\n<div class=\"callout\">Record which of these you are actually seeing before changing any setting. Two faults can look identical on the line and need opposite corrections.<\/div>\n<p><!-- upl-conv-v1 quickcta --><\/p>\n<div class=\"quickcta\">\n<p class=\"mod-h\">Need a fixed price for this formed tray?<\/p>\n<p>Send the tray drawing, sheet gauge and annual volume. We will review draft, trim and material, then quote a production tool with a written line-acceptance test.<\/p>\n<p class=\"quickcta-act\"><a class=\"quickcta-btn\" href=\"https:\/\/uplastech.com\/vacuum-forming\/\">Get a thermoforming quotation<\/a><a class=\"quickcta-alt\" href=\"mailto:john@uplastech.com\">Email john@uplastech.com<\/a><a class=\"quickcta-alt\" href=\"https:\/\/wa.me\/8617717529949\">WhatsApp<\/a><\/p>\n<\/div>\n<h2 id=\"run-a-gauge-r-r-study-before-debating-the-dimension\">Run a gauge R&R study before debating the dimension<\/h2>\n<p>Run the standard study: 10 parts \u00d7 3 operators \u00d7 3 repeats = 90 readings on the same 180.0 mm flange. An unfixtured calliper returns about 24 % gauge R&R; a 3-2-1 nest with a dial indicator brings it to 8 %.<\/p>\n<div class=\"steps\">\n<p class=\"mod-h\">A five-step diagnostic sequence<\/p>\n<ol>\n<li><b>Agree the datum.<\/b><br \/>Mark a 3-2-1 datum and three locating pads on the tray drawing.<\/li>\n<li><b>Build one fixture.<\/b><br \/>Use a single granite nest with a dial indicator at 20 \u00b0C for both parties.<\/li>\n<li><b>Run the study.<\/b><br \/>Measure 10 parts \u00d7 3 operators \u00d7 3 repeats and compute gauge R&R.<\/li>\n<li><b>Check the fixture.<\/b><br \/>Verify pad flatness and locating error below 0.1 mm before first-off.<\/li>\n<li><b>Gate the approval.<\/b><br \/>Release the first article only when gauge R&R is \u2264 10 %.<\/li>\n<\/ol>\n<\/div>\n<p>The chart below is a typical result from that measurement step. Use it to separate a design limit from a setting that can still be recovered.<\/p>\n<figure>\n<img decoding=\"async\" src=\"https:\/\/uplastech.com\/wp-content\/uploads\/2026\/11\/thermoformed-part-first-article-gauge-rr-chart.jpg\" alt=\"Gauge R&R on the First Article: When Buyer and Supplier Disagree on 0.5 mm: calculated response trend and an illustrative root-cause split\" width=\"1536\" height=\"909\"><figcaption>Figure 1 \u2014 Calculated response trend and an illustrative root-cause split. Values are engineering guidance for diagnosis, not a measured survey; confirm them on your own line before changing a drawing or a specification.<\/figcaption><\/figure>\n<h2 id=\"datum-fixture-and-gauge-to-specify-on-the-drawing\">Datum, fixture and gauge to specify on the drawing<\/h2>\n<p>Three things belong on the drawing: a 3-2-1 datum on the mould-side face, a single nest fixture with three locating pads, and a dial indicator at 20 \u00b0C. With a 0.1 mm locating error, gauge R&R stays under 10 %.<\/p>\n<table class=\"spec\">\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Typical target<\/th>\n<th>What goes wrong outside it<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Gauge R&R<\/td>\n<td>\u2264 10 % of the tolerance<\/td>\n<td>Above 10 % the measurement cannot judge the part<\/td>\n<\/tr>\n<tr>\n<td>Study plan<\/td>\n<td>10 parts \u00d7 3 operators \u00d7 3 repeats<\/td>\n<td>90 readings expose repeatability and reproducibility<\/td>\n<\/tr>\n<tr>\n<td>Datum scheme<\/td>\n<td>3-2-1 on the mould-side face<\/td>\n<td>Each side otherwise references a different face<\/td>\n<\/tr>\n<tr>\n<td>Measurement temperature<\/td>\n<td>20 \u00b0C +\/- 1 \u00b0C<\/td>\n<td>A 30 \u00b0C calliper reads a different flange width<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 2 - Measurement parameters to write on the tray drawing<\/p>\n<h2 id=\"variables-that-widen-the-spread-after-first-off\">Variables that widen the spread after first-off<\/h2>\n<p>The spread widens again as conditions change. A calliper held at 30 \u00b0C expands, a warped nest lifts one datum pad, and a different operator measuring the flange at a 15\u00b0 angle adds parallax error each time.<\/p>\n<table>\n<thead>\n<tr>\n<th>Process variable<\/th>\n<th>Effect on gauge R&R<\/th>\n<th>Practical control<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Calliper used instead of a nest gauge<\/td>\n<td>Operator angle and force dominate the spread<\/td>\n<td>Fix a dial indicator in a 3-2-1 nest<\/td>\n<\/tr>\n<tr>\n<td>Measurement at 30 \u00b0C<\/td>\n<td>Thermal expansion adds apparent drift<\/td>\n<td>Measure at a declared 20 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Datum not marked on the drawing<\/td>\n<td>Each side picks its own reference face<\/td>\n<td>Dimension from the three datum pads<\/td>\n<\/tr>\n<tr>\n<td>Nest pad worn by 0.1 mm<\/td>\n<td>Locating error raises gauge R&R above 10 %<\/td>\n<td>Re-qualify the fixture before first-off<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 3 - Variables that widen the measurement spread after first-off<\/p>\n<div class=\"myth\"><b>Myth:<\/b> \"A process adjustment will fix it.\" Once a design limit is reached, more tuning only adds cost and variation. Confirm the limit with a measurement, then change the drawing or the specification.<\/div>\n<h2 id=\"a-gauge-r-r-gate-for-first-article-approval\">A gauge R&R gate for first-article approval<\/h2>\n<p>Two readings cannot settle a first article. Add a clause: gauge R&R \u2264 10 % from 10 parts \u00d7 3 operators \u00d7 3 repeats, on a declared 3-2-1 datum and fixture at 20 \u00b0C, before any dimension is judged.<\/p>\n<div class=\"conv\">\n<p class=\"mod-h\">Want the tray checked against your line?<\/p>\n<p>Send us the tray drawing and the line conditions. We will flag the geometry and material choices that cause jams, and quote a tool with an acceptance test.<\/p>\n<p class=\"conv-lbl\">What to send us<\/p>\n<ul class=\"conv-need\">\n<li>Tray drawing with draft and radii<\/li>\n<li>Sheet grade and gauge<\/li>\n<li>Stack depth and line speed<\/li>\n<li>Drawings of the magazine or denester<\/li>\n<\/ul>\n<p><a class=\"conv-btn\" href=\"\/vacuum-forming\/\">Send the tray drawing<\/a>\n<\/div>\n<h2 id=\"costing-one-shared-fixture-against-a-stalled-first-article\">Costing one shared fixture against a stalled first article<\/h2>\n<p>One shared nest fixture and a written datum cost roughly \u00a3800-1 500 but release the 90 000-part first article. A week of held parts and a re-inspection sort cost more than the fixture across the order.<\/p>\n<div class=\"callout\">Validate one change at a time and keep the measurement record. A supplier discussion backed by data is resolved in days, not weeks.<\/div>\n<div class=\"checklist\">\n<p class=\"mod-h\">Before you sign off this thermoformed tool<\/p>\n<ul>\n<li>A 3-2-1 datum and three locating pads are dimensioned on the tray drawing<\/li>\n<li>A single shared nest fixture and dial indicator are named in the inspection method<\/li>\n<li>Measurement temperature of 20 \u00b0C +\/- 1 \u00b0C is stated on the drawing<\/li>\n<li>A gauge R&R \u2264 10 % from 10 parts \u00d7 3 operators \u00d7 3 repeats gates first-article approval<\/li>\n<li>Both parties use the same fixture and record the 90 readings together<\/li>\n<\/ul>\n<p class=\"cl-note\">A tray that looks right in the carton can still stop a filling line. Test the stack, not a single part.<\/p>\n<\/div>\n<div class=\"faq\">\n<h3>Why do buyer and supplier disagree by 0.50 mm?<\/h3>\n<p>They are usually measuring different datums with different fixtures. On a 0.80 mm tolerance band a 0.50 mm spread consumes 62.5 % of the band. Run a gauge R&R study before discussing the part.<\/p>\n<h3>What is an acceptable gauge R&R?<\/h3>\n<p>Under 10 % of the tolerance is acceptable for first-article approval; 10-30 % is marginal. An unfixtured calliper returned about 24 %, and a 3-2-1 nest with a dial indicator brought it to 8 %.<\/p>\n<h3>Why 10 parts, 3 operators and 3 repeats?<\/h3>\n<p>The 10 \u00d7 3 \u00d7 3 = 90 readings separate part variation, operator reproducibility and gauge repeatability. A single reading cannot show which of the three dominates the 0.50 mm spread.<\/p>\n<h3>Can a better calliper fix it?<\/h3>\n<p>Not on its own. The datum and the fixture decide where the measurement sits. Specify the three locating pads and hold the gauge in a nest at 20 \u00b0C, then re-run the R&R study.<\/p>\n<h3>Does temperature really matter?<\/h3>\n<p>A calliper and a 180 mm PET tray both expand between 20 \u00b0C and 30 \u00b0C. State 20 \u00b0C +\/- 1 \u00b0C in the inspection method so the two parties' numbers are comparable.<\/p>\n<h3>What should the first-article clause say?<\/h3>\n<p>Gauge R&R \u2264 10 % of tolerance from 10 parts \u00d7 3 operators \u00d7 3 repeats on a declared 3-2-1 datum and shared fixture at 20 \u00b0C +\/- 1 \u00b0C, with the 90-reading record attached to approval.<\/p>\n<\/div>\n<div class=\"cta\">\n<p class=\"cta-h\">Get a tray that runs on your filling line<\/p>\n<p>Send us the tray drawing or a sample stack. We will review draft, trim and material, then quote a production tool with a measurable line-acceptance test written into it.<\/p>\n<p class=\"cta-lbl\">To get an accurate quote, send:<\/p>\n<ul class=\"cta-need\">\n<li>Tray drawing or sample stack<\/li>\n<li>Sheet material and gauge<\/li>\n<li>Line speed and denesting method<\/li>\n<li>Annual volume and target unit price<\/li>\n<\/ul>\n<p><a class=\"btn\" href=\"\/vacuum-forming\/\">Request a tool and tray quotation<\/a><br \/>\n<!-- upl-conv-v1 contact --><\/p>\n<div class=\"contactbar\">\n<p class=\"contactbar-h\">Prefer to talk it through first?<\/p>\n<p>Email <a href=\"mailto:john@uplastech.com\">john@uplastech.com<\/a> or message us on <a href=\"https:\/\/wa.me\/8617717529949\">WhatsApp +86 177 1752 9949<\/a>. Send a drawing, a sample or a specification and an engineer will reply.<\/p>\n<\/div>\n<p><!-- upl-conv-v1 trust --><\/p>\n<div class=\"trust\">\n<p class=\"trust-h\">Why buyers work with Uplastech<\/p>\n<p>ISO 9001, ISO 14001 and ISO 45001 certified. Founded in 2016, with injection moulding lines in Shanghai and an extrusion plant in Jiangsu. Moulding machines from 90T to 1100T and a maximum shot weight of 5100 g. Samples and a written quotation are available on request.<\/p>\n<\/div>\n<\/div>\n<div class=\"rel\">\n<h4>Continue reading<\/h4>\n<ul>\n<li><a href=\"https:\/\/uplastech.com\/thermoforming-sheet-thickness-tolerance\/\">Thermoforming sheet thickness tolerance<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/thermoforming-stacking-nesting\/\">Thermoforming stacking and nesting<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/thermoforming-tolerances\/\">Thermoforming tolerances<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/thermoforming-trimming-methods\/\">Thermoforming trimming methods<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/effects-of-manufacturing-defects-on-thermoformed-packaging-quality\/\">Manufacturing defects in thermoformed packaging<\/a><\/li>\n<\/ul>\n<p><!-- upl-conv-v1 service --><\/p>\n<p class=\"rel-svc\">Ready to specify? See our <a href=\"https:\/\/uplastech.com\/vacuum-forming\/\">vacuum forming and thermoforming services<\/a> or <a href=\"mailto:john@uplastech.com\">request a written quotation<\/a>.<\/p>\n<\/div>\n<\/div>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Why do buyer and supplier disagree by 0.50 mm?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"They are usually measuring different datums with different fixtures. On a 0.80 mm tolerance band a 0.50 mm spread consumes 62.5 % of the band. Run a gauge R&R study before discussing the part.\"}}, {\"@type\": \"Question\", \"name\": \"What is an acceptable gauge R&R?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Under 10 % of the tolerance is acceptable for first-article approval; 10-30 % is marginal. An unfixtured calliper returned about 24 %, and a 3-2-1 nest with a dial indicator brought it to 8 %.\"}}, {\"@type\": \"Question\", \"name\": \"Why 10 parts, 3 operators and 3 repeats?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The 10 \u00d7 3 \u00d7 3 = 90 readings separate part variation, operator reproducibility and gauge repeatability. A single reading cannot show which of the three dominates the 0.50 mm spread.\"}}, {\"@type\": \"Question\", \"name\": \"Can a better calliper fix it?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Not on its own. The datum and the fixture decide where the measurement sits. Specify the three locating pads and hold the gauge in a nest at 20 \u00b0C, then re-run the R&R study.\"}}, {\"@type\": \"Question\", \"name\": \"Does temperature really matter?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A calliper and a 180 mm PET tray both expand between 20 \u00b0C and 30 \u00b0C. State 20 \u00b0C +\/- 1 \u00b0C in the inspection method so the two parties' numbers are comparable.\"}}, {\"@type\": \"Question\", \"name\": \"What should the first-article clause say?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Gauge R&R \u2264 10 % of tolerance from 10 parts \u00d7 3 operators \u00d7 3 repeats on a declared 3-2-1 datum and shared fixture at 20 \u00b0C +\/- 1 \u00b0C, with the 90-reading record attached to approval.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This guide shows how to run a gauge R&#038;R study, define a 3-2-1 datum and fixture, and write a measurement method into the tray drawing.<\/p>","protected":false},"author":1,"featured_media":9358,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[],"class_list":["post-9360","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vacuum-forming"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/uplastech.com\/de\/wp-json\/wp\/v2\/posts\/9360","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/uplastech.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/uplastech.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/uplastech.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/uplastech.com\/de\/wp-json\/wp\/v2\/comments?post=9360"}],"version-history":[{"count":1,"href":"https:\/\/uplastech.com\/de\/wp-json\/wp\/v2\/posts\/9360\/revisions"}],"predecessor-version":[{"id":9929,"href":"https:\/\/uplastech.com\/de\/wp-json\/wp\/v2\/posts\/9360\/revisions\/9929"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/uplastech.com\/de\/wp-json\/wp\/v2\/media\/9358"}],"wp:attachment":[{"href":"https:\/\/uplastech.com\/de\/wp-json\/wp\/v2\/media?parent=9360"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/uplastech.com\/de\/wp-json\/wp\/v2\/categories?post=9360"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/uplastech.com\/de\/wp-json\/wp\/v2\/tags?post=9360"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}