{"id":3158,"date":"2026-02-04T11:31:24","date_gmt":"2026-02-04T10:31:24","guid":{"rendered":"https:\/\/madtools.it\/foratura-profonda5xd-20xd-problematiche-tecniche-e-soluzioni\/"},"modified":"2026-02-05T17:10:24","modified_gmt":"2026-02-05T16:10:24","slug":"foratura-profonda5xd-20xd-problematiche-tecniche-e-soluzioni","status":"publish","type":"post","link":"https:\/\/madtools.it\/en\/foratura-profonda5xd-20xd-problematiche-tecniche-e-soluzioni\/","title":{"rendered":"Deep Hole Drilling(5\u00d7D \u2013 20\u00d7D): Technical Issues and Solutions"},"content":{"rendered":"\n<p><strong><em>A practical guide to real-world problems and how to address them for diameters from \u00d81 to \u00d825 mm<\/em><\/strong><\/p>\n\n\n\n<p><strong><em><a href=\"https:\/\/madtools.it\/en\/products\/foratura-e-alesatura\/\">Deep hole drilling<\/a><\/em><\/strong> with a depth-to-diameter ratio between 5 and 20 is one of the most critical machining operations.<br>In this range, chip evacuation, temperature control, hole stability, and tool life become difficult variables to manage.<\/p>\n\n\n\n<p><strong>1. Chip clogging and tool breakage<\/strong><\/p>\n\n\n\n<p>When chips are not evacuated continuously, they pack in front of the cutting edge, causing:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Increased cutting torque<\/li>\n\n\n\n<li>Localized overheating<\/li>\n\n\n\n<li>Sudden drill breakage<\/li>\n<\/ul>\n\n\n\n<p>This problem is critical with materials that produce long chips (austenitic stainless steels, titanium).<br>The chip curls and gets stuck in the evacuation channel.<\/p>\n\n\n\n<p><strong>2. Insufficient thermal control<\/strong><\/p>\n\n\n\n<p>The coolant must reach the cutting edge deep inside the hole with sufficient pressure to cool and push the chips away. If the pressure is too low or the channel is poorly designed, the temperature rises rapidly, compromising surface quality and tool life.<\/p>\n\n\n\n<p><strong>3. Axial deviation<\/strong><\/p>\n\n\n\n<p>As depth increases, the hole tends to deviate from the theoretical axis due to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Unbalanced cutting forces<\/li>\n\n\n\n<li>Tool deflection<\/li>\n\n\n\n<li>Lack of lateral guidance<\/li>\n<\/ul>\n\n\n\n<p>Result: crooked, ovalized, out-of-tolerance holes.<\/p>\n\n\n\n<p><strong>4. Irregular surface roughness<\/strong><\/p>\n\n\n\n<p>Vibrations, chip accumulation, and uneven cutting-edge wear leave scratches and areas with variable roughness on the hole wall.<\/p>\n\n\n\n<p><strong>Technical Solutions<\/strong><\/p>\n\n\n\n<p><strong>1. Correct drill geometry<\/strong><\/p>\n\n\n\n<p><strong>Gun drill (single-lip)<\/strong> \u2013 the ideal solution for \u00d81\u201325 mm when high quality is required:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Single cutting edge with an internal coolant channel<\/li>\n\n\n\n<li>Chip evacuation through a V-shaped groove<\/li>\n<\/ul>\n\n\n\n<p><strong>Critical geometric elements:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rake angle: affects chip formation and temperature<\/li>\n\n\n\n<li>Chip breaker: determines whether the chip breaks or remains long<\/li>\n\n\n\n<li>Evacuation channel: sized according to the chip type<\/li>\n<\/ul>\n\n\n\n<p><strong>2. Properly sized coolant system<\/strong><\/p>\n\n\n\n<p><strong>Parameters to control:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Pressure<\/strong>: 20\u201380 bar depending on diameter and depth (for gun drilling)<\/li>\n\n\n\n<li><strong>Coolant quality<\/strong>\n<ul class=\"wp-block-list\">\n<li>Stable emulsion concentration<\/li>\n\n\n\n<li>Effective filtration (suspended chips reduce lubrication)<\/li>\n\n\n\n<li>Controlled temperature<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>3. Optimized cutting parameters<\/strong><\/p>\n\n\n\n<p>Cutting speed and feed must be calibrated together. In deep hole drilling, it is better to be conservative: a longer but stable cycle produces fewer rejects than aggressive parameters.<\/p>\n\n\n\n<p><strong>4. Machine system rigidity<\/strong><\/p>\n\n\n\n<p><strong>Checkpoints:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spindle concentricity<\/li>\n\n\n\n<li>Toolholder rigidity<\/li>\n\n\n\n<li>Workpiece\u2013spindle alignment<\/li>\n<\/ul>\n\n\n\n<p><strong>Monitoring<\/strong>: variations in torque and abnormal vibrations indicate issues in progress.<\/p>\n\n\n\n<p><strong>Practical Case: \u00d83 mm \u00d7 24 mm on Ti6Al4V Titanium<\/strong><\/p>\n\n\n\n<p><strong>Application<\/strong>: through-holes for medical implants<br><strong>Tolerances<\/strong>: straightness 0.05 mm, Ra &lt; 0.8 \u00b5m<\/p>\n\n\n\n<p><strong>Problem<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>15% scrap rate<\/li>\n\n\n\n<li>Tool breakage every 20\u201325 holes<\/li>\n\n\n\n<li>Scratched surface finish<\/li>\n<\/ul>\n\n\n\n<p><strong>Cause<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Standard drill with undersized evacuation channel<\/li>\n\n\n\n<li>Insufficient coolant pressure (30 bar)<\/li>\n<\/ul>\n\n\n\n<p><strong>Solution<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gun drill<\/li>\n\n\n\n<li>V-groove optimized for titanium chips<\/li>\n\n\n\n<li>Coating + superfinishing<\/li>\n\n\n\n<li>Coolant pressure increased to 70 bar<\/li>\n\n\n\n<li>Parameters: Vc 18 m\/min, f 0.02 mm\/rev<\/li>\n<\/ul>\n\n\n\n<p><strong>Results<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Scrap rate: 2%<\/li>\n\n\n\n<li>Tool life: 180\u2013200 holes<\/li>\n\n\n\n<li>Straightness: 0.03 mm<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>A practical guide to real-world problems and how to address them for diameters from \u00d81 to \u00d825 mm Deep hole drilling with a depth-to-diameter ratio between 5 and 20 is one of the most critical machining operations.In this range, chip evacuation, temperature control, hole stability, and tool life become difficult variables to manage. 1. Chip [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3153,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[45],"tags":[],"class_list":["post-3158","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-categorizzato-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Deep Hole Drilling(5\u00d7D \u2013 20\u00d7D): Technical Issues and Solutions - MadTools<\/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:\/\/madtools.it\/foratura-profonda5xd-20xd-problematiche-tecniche-e-soluzioni\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Deep Hole Drilling(5\u00d7D \u2013 20\u00d7D): Technical Issues and Solutions - MadTools\" \/>\n<meta property=\"og:description\" content=\"A practical guide to real-world problems and how to address them for diameters from \u00d81 to \u00d825 mm Deep hole drilling with a depth-to-diameter ratio between 5 and 20 is one of the most critical machining operations.In this range, chip evacuation, temperature control, hole stability, and tool life become difficult variables to manage. 1. 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