Machine tool metrology

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alignment tests on pillar type drilling machine

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Machine tool metrology

  1. 1. Machine Tool Metrology Alignment tests on pillar type drilling machine – A case study By Mr.B.Ramesh, M.E., (Ph.D.), Associate Professor, Department of Mechanical Engineering,, St. Joseph’s College of Engineering, Jeppiaar Trust, Chennai-119
  2. 2. January 30, 2015 2 INTRODUCTION • Machine tool metrology • The alignment test on a machine tool is carried out to check the grade of manufacturing accuracy of the machine tool. • The geometrical checks made on machine tools are : * Straightness and flatness of guide ways and slide ways of machine tool. * Flatness of machine tables * Parallelism, equidistance and alignment of the slide ways. * True running and alignment of shaft and spindle. * Lead of lead screw or error in pitch. • The geometrical test is carried out to check the grade of manufacturing accuracy of the machine tool. • Practical test is carried out to check the accuracy of the finished component. • Geometrical test consists of checking the relationship between various machine elements when the machine tool is idle. • Practical test consists of preparing the actual test jobs on the machine and checking the accuracy of the jobs produced.
  3. 3. January 30, 2015 3 • Static tests • Dynamic tests • Importance of alignment test : The geometry of various shapes is based on the relative motion between various machine parts and hence on alignment of various parts. • Other parameters subjected to tests are : * Stiffness and rigidity of the machine tool and its components parts. * The quality and accuracy of the control devices and the driving mechanism.
  4. 4. January 30, 2015 4 Alignment tests on pillar type drilling machine * Properly Installed – In both horizontal (longitudinal and transverse directions) and vertical directions. 1. Flatness of clamping surface of base: * Straight edge on two gauge blocks * Feeler gauges gives error * Error should not exceed 0.1/1000 mm clamping surface * Surface should be concave only 2. Flatness of clamping surface of table:
  5. 5. January 30, 2015 5 3. Perpendicularity of drill head guide to the base plate : * Tested in both vertical plane(a) and in a plane at 900 to the above plane (b) * Frame level with graduations from 0.03 to 0.05 mm/m * Error should not exceed 0.25/1000 mm for (a) and 0.15/1000 mm for (b) 4. Perpendicularity of drill head guide with table : 5. Perpendicularity of spindle sleeve with base plate : * Tested in both the planes using frame level * Error should not exceed 0.25/1000 mm for plane (a) and 0.15/1000 mm for plane (b)
  6. 6. January 30, 2015 6 6. True running of spindle taper : * Test mandrel is palced in the tapered hole of spindle * Dial indicator * Spindle rotated slowly * Error should not exceed 0.03/100 mm for machines with taper upto Morse No. 2 and 0.04/300 mm for machines with taper larger than Morse No. 2
  7. 7. January 30, 2015 7 7. Parallelism of the spindle axis with its vertical movement : * Test is performed into twp planes A & B * Test mandrel and dial indicator * Spindle is adjusted in the middle position of its travel * Permissible errors are : For machines with taper upto Morse No. 2 0.03/100 mm for plane A and 0.03/100 mm for plane B. * For machines with taper larger than Morse No. 2 0.05/300 mm for plane A and 0.05/300 mm for plane B.
  8. 8. January 30, 2015 8 8. Squareness of clamping surface of table to its axis : * Dial indicator * Table is slowly rotated * Error should not exceed 0.05/300 mm diameter
  9. 9. January 30, 2015 9 9. Squareness of spindle axis with table : * Straight edge placed in position AA’ and BB’ * Work table in middle position of its vertical travel * Dial indicator * A – 1800 – A’ * The permissible errors are 0.08/300 mm for AA’ and 0.05/300 mm for BB’.
  10. 10. January 30, 2015 10 10. Total deflection : * Drill head and table are arranged in their middle position. * Dial indicator * Dynamometer
  11. 11. January 30, 2015 11 Thank You

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