[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-632348-105":59,"doc-detail-632348-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","heule-cofa-deburring-of-uneven-bore-edges-operating-principle-tool-selection","HEULE COFA - Deburring of Uneven Bore Edges - Operating Principle & Tool Selection","","COFA is a HEULE deburring tool designed to reliably machine inaccessible uneven bore edges without turning the workpiece, even with challenging materials. Carbide blades with material-specific coatings provide long service life. The spring-loaded blade follows uneven bore geometry, removing burrs with the burr root to prevent secondary burr formation and producing bore edges with a defined radius. The material guide links cutting speed, feed, and spring settings to different workpiece groups.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/heule-cofa-deburring-of-uneven-bore-edges-operating-principle-tool-selection/632348/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/heule-cofa-deburring-of-uneven-bore-edges-operating-principle-tool-selection/632348.png","ImageObject",300,407,{"name":92,"@type":93},"Alex Sinclair","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-26","2026-10-22",true,{"@type":102,"interactionType":103,"userInteractionCount":14},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What problem does COFA solve?","Question",{"text":112,"@type":113},"COFA deburrs even and uneven bore edges, including inaccessible edge areas, without requiring workpiece turning.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How does the COFA blade work on uneven bore edges?",{"text":117,"@type":113},"The spring-loaded blade in the tool body lets the cutting edge follow uneven bore edges, removing the burr along with the burr root to avoid secondary burrs.",{"name":119,"@type":110,"acceptedAnswer":120},"How are tool and cutting parameters selected?",{"text":121,"@type":113},"Use the HEULE Tool Selector to calculate the cant (unevenness) angle and determine the correct tool and blade, then apply the cutting data guide values (speed, feed, spring) based on the selected material group and unevenness amount.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},632348,1793030247,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":14,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":36},1099523882182,"https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8","DE BURRING  \n14  \nCOFA  \nA stroke of genius for deburring even and uneven bore edges . Proven a thousand times over.  \nThe advantages –  Your benefit  \nInaccessible bore edges are reliably machined without turning the workpiece, even when working with challenging materials.  \nThe carbide blades are coated in accordance with material requirements and guarantee a long service life.  \nCOFA  \nOPERATING PRINCIPLE  \nThe COFA blade is spring-loaded in the tool body. This means that the cutting edge also follows uneven bore edges. The cutting edge removes the burr along with the burr root without creating a secondary burr. The blade pivots into the tool body as it enters the bore.  \nThe result is a bore edge deburred with a radius form.  \nMAXIMUM UNEVENNESS  \nCOFA is designed for machining uneven bore edges. The standard blade can reliably deburr uneven edges up to α ≤18° . This corresponds to a diameter ratio (d:D) of 0.5.  \nThe range also includes blades with a clearance angle of up to 30° for greater unevenness. For larger irregularities, tools and blades from the INDIVIDUAL range, e.g. COFA-X, are used.  \nD  \nd  \nD  \nCalculation of cant angle  \nWith the HEULE Tool Selector, you can easily calculate the angle of unevenness and at the same time determine the correct tool and blade.  \n[heule.com/en/tool-selector/cofa](heule.com/en/tool-selector/cofa)  \nTOOL DESIGN  \nSimple, robust, reliable. The COFA tool family is made up of two types. In the COFA C2/C3 and 4M/5M, the blade is held directly in the tool body by a split pin.  \nWith the COFA C6 to C12, a separate blade is retained and guided by a solid blade holder.  \nFixing strip  \nBlade  \nSplit pin  \nBending spring  \nBlade holder  \nCOFA  \nTool body  \nTorx screw  \nOperating instructions  \n> Blade change> Spring change  \n[heule.com](heule.com) > Service > Media & download centre  \nCOFA  \nCOFA PROCESS STEPS APPLICATION AND PROGRAMMING EXAMPLE  \nZ+  \nZ-  \nApplication data  \nWorkpiece: Outside Ø 35.0 mm / inside Ø 22.0 mm  \nBore Ø: Ø10 .4 mm  \nMaterial: P3 / steel C45  \nMachining: both bore edges  \nUnevenness y: Angle 15.9°  \nTool and blade selection  \nTool: COFA C8/10 .4/H  \nBlade: C8-M-0006-T, medium, forward and backward cutting  \nDeburring Ø: 11.6 mm max.  \nOutside Ø: Ø D2 = 13.2 mm (note interfering edge / inside Ø)  \nCutting data  \nCutting speed Vc: 20–60 m/min.  \nWorking feed fz: 0.1–0.3 mm/rev  \nCUTTING DATA  \n\n|  | Description | Tensile str. RM /MPA | Hardness |  | Spring | C2–C3 |  |  | COFA4M–C12 |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n|  |  |  | (HB) | (HRC) |  | Vc | fz | B* | Vc | fz | B* |\n| P0 | Low-carbon steel, long-chipping, C \u003C0.25% | \u003C530 | \u003C125 | – | H | 20–60 | 0.05–0.15 | A | 20–60 | 0.1–0.3 | T |\n| P1 | Low-carbon steel, short-chipping, C \u003C0.25% | \u003C530 | \u003C125 | – | H | 20–60 | 0.05–0.15 | A | 20–60 | 0.1–0.3 | T |\n| P2 | Steel with carbon content C >0 . 25% | >530 | \u003C220 | \u003C25 | H | 20–60 | 0.05–0.15 | A | 20–60 | 0.1–0.3 | T |\n| P3 | Alloy steel and tool steel, C >0.25% | 600–850 | \u003C330 | \u003C35 | H | 20–60 | 0.05–0.15 | A | 20–60 | 0.1–0.3 | T |\n| P4 | Alloy steel and tool steel, C >0.25% | 850–1400 | 340–450 | 35–48 | S | 20–40 | 0.05–0.15 | A | 20–40 | 0.1–0.3 | T |\n| P5 | Ferritic, martensitic and stainless\u003Cbr>PH steel | 600–900 | \u003C330 | \u003C35 | S | 15–30 | 0.05–0.15 | A | 15–30 | 0.1–0.3 | T |\n| P6 | High-strength ferritic, martensitic and PH stainless steel | 900–1350 | 350–450 | 35–48 | Z | 15–30 | 0.05–0.15 | A | 15–30 | 0.1–0.3 | T |\n| M1 | Austenitic stainless steel | \u003C600 | 130–200 | – | Z | 10–20 | 0.05–0.15 | A | 10–20 | 0.1–0.3 | T |\n| M2 | High-strength austenitic stainless steel | 600–800 | 150–230 | \u003C25 | Z1 | 10–20 | 0.05–0.15 | A | 10–20 | 0.1–0.3 | T |\n| M3 | Duplex stainless steel | \u003C800 | 135–275 | \u003C30 | Z1 | 15–30 | 0.05–0.15 | A | 15–30 | 0.1–0.3 | T |\n| K1 | Cast iron | 125–500 | 120–290 | \u003C32 | H | 30–80 | 0.05–0.15 | A | 30–80 | 0.1–0.3 | T |\n| K2 | Ductile cast iron up to medium strength | \u003C600 | 13","cbCaiqtWiL5Ae2aX","https://ap.wps.com/l/cbCaiqtWiL5Ae2aX","pdf",3460461,16,"English","# COFA\n## Operating principle\n## Maximum unevenness\n## Tool design\n## COFA process steps and application example\n## Cutting data guide values\n## Tool selector and tool tables","[{\"question\":\"What problem does COFA solve?\",\"answer\":\"COFA deburrs even and uneven bore edges, including inaccessible edge areas, without requiring workpiece turning.\"},{\"question\":\"How does the COFA blade work on uneven bore edges?\",\"answer\":\"The spring-loaded blade in the tool body lets the cutting edge follow uneven bore edges, removing the burr along with the burr root to avoid secondary burrs.\"},{\"question\":\"How are tool and cutting parameters selected?\",\"answer\":\"Use the HEULE Tool Selector to calculate the cant (unevenness) angle and determine the correct tool and blade, then apply the cutting data guide values (speed, feed, spring) based on the selected material group and unevenness amount.\"}]","HEULE COFA - Deburring of Uneven Bore Edges - Operating Principle & Tool Selection | PDF",1792670321]