{"id":24838,"date":"2020-10-12T11:00:20","date_gmt":"2020-10-12T09:00:20","guid":{"rendered":"https:\/\/www.yamawa.eu\/spiral-fluted-taps-adjusting-the-bored-hole-size\/"},"modified":"2020-10-14T14:06:46","modified_gmt":"2020-10-14T12:06:46","slug":"spiral-fluted-taps-adjusting-the-bored-hole-size","status":"publish","type":"post","link":"https:\/\/www.yamawa.eu\/it\/spiral-fluted-taps-adjusting-the-bored-hole-size\/","title":{"rendered":"Maschi elicoidali: scelta del preforo"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\" class=\"lead\"><em>Nella maschiatura di differenti materiali con maschi elicoidali, occasionalmente possono insorgere problemi di varia natura quali scheggiatura dell\u2019utensile (pi\u00f9 o meno marcata), rottura, o incollaggio del truciolo. Questi problemi si possono risolvere adottando alcuni accorgimenti.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Una soluzione semplice e fattibile \u00e8 adottare un diverso diametro di preforo realizzandone uno il pi\u00f9 largo possibile. Regolare il preforo su una dimensione sufficientemente ampia e accettabile potrebbe risolvere i problemi di cui sopra senza troppe difficolt\u00e0. La scelta del diametro del preforo corretto, infatti, \u00e8 un argomento ancora poco enfatizzato e una migliore conoscenza di questa fase della lavorazione permetterebbe di risolvere gran parte dei problemi una volta per tutte.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si potrebbe obiettare che ad ogni taglia di maschio \u00e8 associato un solo diametro di preforo. Se cos\u00ec fosse, ad esempio, per una filettatura M8x1.25 si dovr\u00e0 realizzare un preforo di 6.8 mm. Tuttavia, questa affermazione deriva dalla pratica comune, ma non \u00e8 del tutto corretta. Ad esempio, in filettature interne con standard in classe ISO 2, 6H, il diametro pi\u00f9 piccolo \u00e8 contenuto entro l\u2019intervallo 6.912~6.647 mm. Quando si riscontrano problemi nella maschiatura, la prima soluzione da adottare \u00e8 quella di allargare il pi\u00f9 possibile il diametro del preforo orientando la scelta verso l\u2019estremit\u00e0 superiore dell\u2019intervallo (dunque, in questo caso, 6.912 mm).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Diamo uno sguardo all&#8217;immagine qui sotto:<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"448\" height=\"272\" src=\"https:\/\/www.yamawa.eu\/wp-content\/uploads\/2020\/10\/Cutting-Volume-ita.jpg\" alt=\"\" class=\"wp-image-24844\" srcset=\"https:\/\/www.yamawa.eu\/wp-content\/uploads\/2020\/10\/Cutting-Volume-ita.jpg 448w, https:\/\/www.yamawa.eu\/wp-content\/uploads\/2020\/10\/Cutting-Volume-ita-300x182.jpg 300w, https:\/\/www.yamawa.eu\/wp-content\/uploads\/2020\/10\/Cutting-Volume-ita-24x15.jpg 24w, https:\/\/www.yamawa.eu\/wp-content\/uploads\/2020\/10\/Cutting-Volume-ita-36x22.jpg 36w, https:\/\/www.yamawa.eu\/wp-content\/uploads\/2020\/10\/Cutting-Volume-ita-48x29.jpg 48w\" sizes=\"auto, (max-width: 448px) 100vw, 448px\" \/><figcaption><em>Volume asportato al variare del diametro preforo<\/em><\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Nella filettatura M8x1.25, l&#8217;allargamento del diametro del preforo di un decimo di millimetro (da 6.8 mm a 6.9 mm, variazione di circa l\u20191%) comporta una riduzione del 15% del volume di truciolo prodotto. Come conseguenza, il carico sul maschio si riduce del 13% e risolve sia i problemi di rottura dell\u2019utensile, sia quelli dell\u2019incollaggio del truciolo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La tabella che segue riporta le dimensioni del preforo (in mm) per le filettature metriche pi\u00f9 comuni. Yamawa suggerisce di <strong>considerare il preforo il pi\u00f9 vicino possibile al massimo valore del diametro inferiore (D1) <\/strong>del filetto interno.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">TAGLIA<\/th><th class=\"has-text-align-center\" data-align=\"center\">D1 MAX [mm]<\/th><th class=\"has-text-align-center\" data-align=\"center\">D1 min [mm]<\/th><th class=\"has-text-align-center\" data-align=\"center\">Dimensione Preforo [mm]<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">M1.4 X 0.3<\/td><td class=\"has-text-align-center\" data-align=\"center\">(1.142)<\/td><td class=\"has-text-align-center\" data-align=\"center\">(1.075)<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.13<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M1.6 X 0.35<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.321<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.221<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.30<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M1.7 X 0.35<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.421<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.321<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.40<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M2 X 0.4<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.679<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.567<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.65<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M2.5 X 0.45<\/td><td class=\"has-text-align-center\" data-align=\"center\">2.138<\/td><td class=\"has-text-align-center\" data-align=\"center\">2.013<\/td><td class=\"has-text-align-center\" data-align=\"center\">2.11<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M3 X 0.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">2.599<\/td><td class=\"has-text-align-center\" data-align=\"center\">2.459<\/td><td class=\"has-text-align-center\" data-align=\"center\">2.56<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M4 X 0.7<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.422<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.242<\/td><td class=\"has-text-align-center\" data-align=\"center\">3.38<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M5 X 0.8<\/td><td class=\"has-text-align-center\" data-align=\"center\">4.334<\/td><td class=\"has-text-align-center\" data-align=\"center\">4.134<\/td><td class=\"has-text-align-center\" data-align=\"center\">4.28<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M6 X 1<\/td><td class=\"has-text-align-center\" data-align=\"center\">5.153<\/td><td class=\"has-text-align-center\" data-align=\"center\">4.917<\/td><td class=\"has-text-align-center\" data-align=\"center\">5.09<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M8 X 1.25<\/td><td class=\"has-text-align-center\" data-align=\"center\">6.912<\/td><td class=\"has-text-align-center\" data-align=\"center\">6.647<\/td><td class=\"has-text-align-center\" data-align=\"center\">6.85<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M10 X 1.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.676<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.376<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.60<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M10 X 1.25<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.912<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.647<\/td><td class=\"has-text-align-center\" data-align=\"center\">8.85<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M12 X 1.75<\/td><td class=\"has-text-align-center\" data-align=\"center\">10.441<\/td><td class=\"has-text-align-center\" data-align=\"center\">10.106<\/td><td class=\"has-text-align-center\" data-align=\"center\">10.4<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M12 X 1.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">10.676<\/td><td class=\"has-text-align-center\" data-align=\"center\">10.376<\/td><td class=\"has-text-align-center\" data-align=\"center\">10.6<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M14 X 2<\/td><td class=\"has-text-align-center\" data-align=\"center\">12.210<\/td><td class=\"has-text-align-center\" data-align=\"center\">11.835<\/td><td class=\"has-text-align-center\" data-align=\"center\">12.1<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M14 X 1.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">12.676<\/td><td class=\"has-text-align-center\" data-align=\"center\">12.376<\/td><td class=\"has-text-align-center\" data-align=\"center\">12.6<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M16 X 2<\/td><td class=\"has-text-align-center\" data-align=\"center\">14.210<\/td><td class=\"has-text-align-center\" data-align=\"center\">13.835<\/td><td class=\"has-text-align-center\" data-align=\"center\">14.1<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M16 X 1.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">14.676<\/td><td class=\"has-text-align-center\" data-align=\"center\">14.376<\/td><td class=\"has-text-align-center\" data-align=\"center\">14.6<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M18 X 2.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">15.744<\/td><td class=\"has-text-align-center\" data-align=\"center\">15.294<\/td><td class=\"has-text-align-center\" data-align=\"center\">15.6<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M18 X 1.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">16.676<\/td><td class=\"has-text-align-center\" data-align=\"center\">16.376<\/td><td class=\"has-text-align-center\" data-align=\"center\">16.6<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M20 X 2.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">17.744<\/td><td class=\"has-text-align-center\" data-align=\"center\">17.294<\/td><td class=\"has-text-align-center\" data-align=\"center\">17.6<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M20 X 1.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">18.676<\/td><td class=\"has-text-align-center\" data-align=\"center\">18.376<\/td><td class=\"has-text-align-center\" data-align=\"center\">18.6<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M24 X 3<\/td><td class=\"has-text-align-center\" data-align=\"center\">21.252<\/td><td class=\"has-text-align-center\" data-align=\"center\">20.752<\/td><td class=\"has-text-align-center\" data-align=\"center\">21.1<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M24 X 1.5<\/td><td class=\"has-text-align-center\" data-align=\"center\">22.676<\/td><td class=\"has-text-align-center\" data-align=\"center\">20.376<\/td><td class=\"has-text-align-center\" data-align=\"center\">20.6<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Nella maschiatura di differenti materiali con maschi elicoidali, occasionalmente possono insorgere problemi di varia natura quali scheggiatura dell\u2019utensile (pi\u00f9 o meno marcata), rottura, o incollaggio del truciolo. Questi problemi si possono risolvere adottando alcuni accorgimenti. Una soluzione semplice e fattibile \u00e8 adottare un diverso diametro di preforo realizzandone uno il pi\u00f9 largo possibile. Regolare il&#8230;  <a href=\"https:\/\/www.yamawa.eu\/it\/spiral-fluted-taps-adjusting-the-bored-hole-size\/\" class=\"more-link\" title=\"Read Maschi elicoidali: scelta del preforo\">Read more &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[643],"tags":[740,741,742,743,961,744],"class_list":["post-24838","post","type-post","status-publish","format-standard","hentry","category-tech-tips-it","tag-bored-hole-it","tag-chipping-it","tag-spiral-fluted-taps-it","tag-tap-breakage-it","tag-tech-tips-it","tag-welding-it"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Maschi elicoidali: scelta del preforo - Yamawa<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.yamawa.eu\/it\/spiral-fluted-taps-adjusting-the-bored-hole-size\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Maschi elicoidali: scelta del preforo - Yamawa\" \/>\n<meta property=\"og:description\" content=\"Nella maschiatura di differenti materiali con maschi elicoidali, occasionalmente possono insorgere problemi di varia natura quali scheggiatura dell\u2019utensile (pi\u00f9 o meno marcata), rottura, o incollaggio del truciolo. Questi problemi si possono risolvere adottando alcuni accorgimenti. Una soluzione semplice e fattibile \u00e8 adottare un diverso diametro di preforo realizzandone uno il pi\u00f9 largo possibile. Regolare il... 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Questi problemi si possono risolvere adottando alcuni accorgimenti. Una soluzione semplice e fattibile \u00e8 adottare un diverso diametro di preforo realizzandone uno il pi\u00f9 largo possibile. Regolare il... 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