{"id":403,"date":"2024-10-10T15:09:00","date_gmt":"2024-10-10T07:09:00","guid":{"rendered":"https:\/\/seaforesttools.com\/?p=403"},"modified":"2024-10-10T15:10:45","modified_gmt":"2024-10-10T07:10:45","slug":"common-cnc-machining-issues-do-you-know-how-to-solve-them","status":"publish","type":"post","link":"https:\/\/seaforesttools.com\/?p=403","title":{"rendered":"Common CNC Machining Issues: Do You Know How to Solve Them?"},"content":{"rendered":"\n

<\/p>\n\n\n\n

 <\/h2>\n\n\n\n

1. Overcutting of the Workpiece:<\/h2>\n\n\n\n

Causes:<\/strong><\/p>\n\n\n\n

    \n
  1. Tool deflection,The tool lacks sufficient strength or is too long or small, causing deflection.<\/li>\n\n\n\n
  2. Operator error.<\/li>\n\n\n\n
  3. Uneven cutting allowance (e.g., 0.5 mm left on the side of a curved surface, but only 0.15 mm left on the bottom).<\/li>\n\n\n\n
  4. Improper cutting parameters (e.g., large tolerance, excessively fast SF setting).<\/li>\n<\/ol>\n\n\n\n

    Improvements:<\/strong><\/p>\n\n\n\n

      \n
    1. Tool selection principle: Use a larger, shorter tool when possible.<\/li>\n\n\n\n
    2. Add a corner cleaning program and keep the allowance as even as possible (ensure the side and bottom allowances are the same).<\/li>\n\n\n\n
    3. Adjust cutting parameters reasonably and round sharp corners in large allowance areas.<\/li>\n\n\n\n
    4. Utilize the machine’s SF function and allow the operator to fine-tune the speed for optimal cutting performance.<\/li>\n<\/ol>\n\n\n\n

      2. Coordinate System Alignment Issues:<\/h2>\n\n\n\n

      Causes:<\/strong><\/p>\n\n\n\n

        \n
      1. Inaccurate manual operation by the operator.<\/li>\n\n\n\n
      2. Burrs around the mold.<\/li>\n\n\n\n
      3. Magnetic centering rod.<\/li>\n\n\n\n
      4. Mold sides are not perpendicular.<\/li>\n<\/ol>\n\n\n\n

        Improvements:<\/strong><\/p>\n\n\n\n

          \n
        1. Manual operation should be repeatedly checked, and centering should be done at the same point and height.<\/li>\n\n\n\n
        2. Use a whetstone or file to remove burrs around the mold, wipe clean with cloth, and confirm by hand.<\/li>\n\n\n\n
        3. Demagnetize the centering rod before use (ceramic centering rods or other alternatives can also be used).<\/li>\n\n\n\n
        4. Check if the mold sides are perpendicular with a dial indicator (significant deviations should be discussed with the mold technician).<\/li>\n<\/ol>\n\n\n\n
          \"\"<\/figure>\n\n\n\n

          3. Tool Offset Issues:<\/h2>\n\n\n\n

          Causes:<\/strong><\/p>\n\n\n\n

            \n
          1. Inaccurate manual operation by the operator.<\/li>\n\n\n\n
          2. Incorrect tool clamping.<\/li>\n\n\n\n
          3. Errors in the fly cutter blade (the fly cutter itself has some inherent errors).<\/li>\n\n\n\n
          4. Discrepancies between R-tool, flat-end tool, and fly cutter.<\/li>\n<\/ol>\n\n\n\n

            Improvements:<\/strong><\/p>\n\n\n\n

              \n
            1. Manual operations should be thoroughly checked, and the same point should be used for tool setting.<\/li>\n\n\n\n
            2. Clean the tool holder with an air gun or wipe with a cloth before clamping.<\/li>\n\n\n\n
            3. Measure the tool holder when using a fly cutter; for flat surfaces, use only one blade.<\/li>\n\n\n\n
            4. Create a separate tool-setting program to avoid discrepancies between R-tools, flat tools, and fly cutters.<\/li>\n<\/ol>\n\n\n\n

              4. CNC Crash \u2013 Programming<\/h2>\n\n\n\n

              Causes:<\/strong><\/p>\n\n\n\n

                \n
              1. Insufficient or missing safe height (during rapid feed G00, the tool or chuck collides with the workpiece).<\/li>\n\n\n\n
              2. Mismatch between the tool specified in the program sheet and the actual tool in the program.<\/li>\n\n\n\n
              3. Incorrect tool length (cutting edge length) on the program sheet versus the actual machining depth.<\/li>\n\n\n\n
              4. Discrepancy between the Z-axis values in the program sheet and the actual Z-axis readings.<\/li>\n\n\n\n
              5. Incorrect coordinate settings during programming.<\/li>\n<\/ol>\n\n\n\n

                Improvements:<\/strong><\/p>\n\n\n\n

                  \n
                1. Accurately measure the workpiece height and ensure the safe height is above the workpiece.<\/li>\n\n\n\n
                2. Ensure the tool specified in the program sheet matches the actual tool (preferably use automated program sheets or include images).<\/li>\n\n\n\n
                3. Measure the actual machining depth on the workpiece and clearly note the tool length and cutting edge length on the program sheet (typically, the tool holder should be 2-3 mm higher than the workpiece, with a clearance of 0.5-1.0 mm for the cutting edge).<\/li>\n\n\n\n
                4. Use the actual Z-axis reading from the workpiece and note it clearly in the program sheet (this is usually done manually and should be checked repeatedly).<\/li>\n\n\n\n
                5. Ensure the correct coordinate settings are used during programming.<\/li>\n<\/ol>\n\n\n\n

                  5. CNC Crash \u2013 Operator:<\/h2>\n\n\n\n

                  Causes:<\/strong><\/p>\n\n\n\n

                    \n
                  1. Incorrect Z-axis tool setting depth.<\/li>\n\n\n\n
                  2. Incorrect centering or data entry (e.g., failure to account for tool radius when measuring from one side).<\/li>\n\n\n\n
                  3. Using the wrong tool (e.g., using a D10 tool instead of a D4 tool).<\/li>\n\n\n\n
                  4. Running the wrong program (e.g., running A7.NC instead of A9.NC).<\/li>\n\n\n\n
                  5. Incorrect manual control direction on the handwheel.<\/li>\n\n\n\n
                  6. Wrong direction during manual rapid feed (e.g., pressing +X instead of -X).<\/li>\n<\/ol>\n\n\n\n

                    Improvements:<\/strong><\/p>\n\n\n\n

                      \n
                    1. Pay attention to the tool setting depth for different positions (bottom, top, analyzed surface, etc.).<\/li>\n\n\n\n
                    2. Repeatedly check centering and data entry after completing these steps.<\/li>\n\n\n\n
                    3. When clamping the tool, double-check it against the program sheet before installation.<\/li>\n\n\n\n
                    4. Run programs one at a time in sequence.<\/li>\n\n\n\n
                    5. Operators should improve their machine operation skills for manual control.<\/li>\n\n\n\n
                    6. Raise the Z-axis above the workpiece before moving during manual rapid feed.<\/li>\n<\/ol>\n\n\n\n

                      6. Curved Surface Precision:<\/h2>\n\n\n\n

                      Causes<\/strong>:<\/p>\n\n\n\n

                        \n
                      1. Inappropriate cutting parameters, resulting in rough surfaces.<\/li>\n\n\n\n
                      2. Dull tool edges.<\/li>\n\n\n\n
                      3. Tool clamping is too long, or the cutting edge is too far from the workpiece.<\/li>\n\n\n\n
                      4. Poor chip removal, air blow, or coolant flow.<\/li>\n\n\n\n
                      5. Programming feed path issues (try to use climb milling where possible).<\/li>\n\n\n\n
                      6. Burrs on the workpiece.<\/li>\n<\/ol>\n\n\n\n

                        Improvements<\/strong>:<\/p>\n\n\n\n

                          \n
                        1. Set reasonable cutting parameters, tolerances, allowances, and feed rates.<\/li>\n\n\n\n
                        2. Operators should periodically check and replace tools as needed.<\/li>\n\n\n\n
                        3. The tool’s extension length should be minimized as much as possible while meeting machining requirements, to avoid excessive tool overhang.<\/li>\n\n\n\n
                        4. For flat tools, R-tools, and round-nose tools, set appropriate speeds and feed rates.<\/li>\n\n\n\n
                        5. Burrs on the workpiece: This is directly related to the machine, tool, and feed path. Therefore, understanding the machine’s performance is crucial, and additional passes may be needed to remove burrs from the edges.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

                            1. Overcutting of the Workpiece: Causes: Improve […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[16,15,12,13,14,17],"_links":{"self":[{"href":"https:\/\/seaforesttools.com\/index.php?rest_route=\/wp\/v2\/posts\/403"}],"collection":[{"href":"https:\/\/seaforesttools.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/seaforesttools.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/seaforesttools.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/seaforesttools.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=403"}],"version-history":[{"count":2,"href":"https:\/\/seaforesttools.com\/index.php?rest_route=\/wp\/v2\/posts\/403\/revisions"}],"predecessor-version":[{"id":406,"href":"https:\/\/seaforesttools.com\/index.php?rest_route=\/wp\/v2\/posts\/403\/revisions\/406"}],"wp:attachment":[{"href":"https:\/\/seaforesttools.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=403"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/seaforesttools.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=403"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/seaforesttools.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=403"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}