{"id":3784,"date":"2025-06-28T13:03:08","date_gmt":"2025-06-28T13:03:08","guid":{"rendered":"https:\/\/help.cadomation.com\/spcad\/docs\/spcadhelp\/geometry\/dog-bone\/"},"modified":"2025-10-15T11:05:29","modified_gmt":"2025-10-15T11:05:29","slug":"dbone","status":"publish","type":"docs","link":"https:\/\/help.cadomation.com\/spcad\/docs\/spcadhelp\/geometry\/dbone\/","title":{"rendered":"DogBone"},"content":{"rendered":"\n

Overview<\/strong> <\/h1>\n\n\n\n

The DogBone tool modifies polyline geometry by applying specialized DogBone-style fillets<\/strong> to sharp interior corners. Unlike regular fillets, DogBone corners introduce small arcs that extend outward, allowing CNC tools with circular bits to accurately cut internal right angles<\/strong>. <\/p>\n\n\n\n

The tool serves essential roles in CNC machining<\/strong>, laser cutting<\/strong>, routing<\/strong>, and woodworking<\/strong>, where precise fitting of components (especially interlocking joints, tabs, and mortises) is required. <\/p>\n\n\n\n

Why DogBones?<\/strong> <\/h2>\n\n\n\n

In CNC operations, especially with round cutting bits<\/strong>, internal corners can\u2019t be cut perfectly square due to the tool\u2019s radius. This creates a problem when mating parts need to fit into 90\u00b0 cutouts. DogBone fillets solve this by adding small arcs (resembling a dog bone shape) that remove additional material and ensure perfect part fitment.<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

Workflow Steps<\/strong> <\/h3>\n\n\n\n
    \n
  1. Launch the tool<\/strong> 
    Type the command DBONE_SP or click on Dogbone from SPCAD Ribbon <\/li>\n<\/ol>\n\n\n\n
      \n
    1. Set Radius (Optional)<\/strong> 
      Type Radius<\/strong> <\/strong>to define the fillet radius for DogBone arcs (default applies if skipped). <\/li>\n<\/ol>\n\n\n\n
        \n
      1. Select Mode<\/strong> 
        Type Polyline<\/strong> <\/strong>to apply DogBone to entire polyline corners<\/strong>, or press ENTER to manually select specific line segments<\/strong>. <\/li>\n<\/ol>\n\n\n\n
          \n
        1. Tool Execution<\/strong> 
          The tool automatically adds DogBone arcs at qualifying corners and replaces sharp junctions with curved reliefs.
           <\/li>\n<\/ol>\n\n\n
          \n
          \"DogBone<\/figure>\n<\/div>\n\n\n

           Technical Details<\/strong> <\/h3>\n\n\n\n
            \n
          • The tool identifies corners by analyzing vertex angles. <\/li>\n\n\n\n
          • A DogBone arc is drawn outside the interior angle<\/strong>, centered tangentially to both adjacent segments. <\/li>\n\n\n\n
          • Works with closed or open polylines<\/strong>, and also supports individual Line segments<\/strong>. <\/li>\n\n\n\n
          • Radius defines how far the arcs protrude\u2014a larger radius = more material removed. <\/li>\n\n\n\n
          • All arcs are constructed in the current UCS and 2D plane. <\/li>\n<\/ul>\n\n\n\n

            Use Cases<\/strong> <\/h3>\n\n\n\n
              \n
            • CNC woodworking joints<\/strong> (tab slots, finger joints) <\/li>\n\n\n\n
            • Acrylic or sheet metal design<\/strong> requiring a mechanical fit <\/li>\n\n\n\n
            • Laser cutting<\/strong> templates for assembly models <\/li>\n\n\n\n
            • Manufacturing jigs or fixtures<\/strong> <\/li>\n<\/ul>\n\n\n\n

              Tips<\/strong> <\/h4>\n\n\n\n

              Combine with JOIN<\/strong> <\/strong>if you want to merge DogBone arcs back into a polyline. <\/p>\n","protected":false},"featured_media":0,"parent":1452,"menu_order":14,"comment_status":"open","ping_status":"closed","template":"","meta":{"_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"doc_tag":[],"class_list":["post-3784","docs","type-docs","status-publish","hentry"],"yoast_head":"\nDogBone Tool for CNC Machining | SPCAD Add-On<\/title>\n<meta name=\"description\" content=\"Apply DogBone fillets to polylines using SPCAD. 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