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Tuesday, 26 November 2013

Surface Grinding Operation

Surface Grinding Operation Points : Surface Grinding Operation Surface grinding produces an accurate flat surface on a pan. This type of grinding is accomplished by fastening the work to the table of the machine and causing it to fed under the revolving grinding wheel. The following procedure should be followed to produce a surface that is as free as possible from waviness.
  1. Select and mount a suitable grinding wheel.
  2. True and dress the wheel with a diamond dressing tool.
  3. Mount the work holding device. If a magnetic chuck is to be mounted to the machine, it should first be ground-in to assure a surface true and parallel with table travel. This should be done each time the chuck is remounted on the machine.
  4. Check the coolant system to see that it is operating satisfactorily.
  5. Locate the work and energize the chuck. If the work is already ground on one surface, protect it and the chuck surface by fitting a piece of oiled paper between them before energizing the chuck.
  6. Adjust the table stops.
  7. Check the holding power of the chuck by trying to move the work.
  8. Turn on the coolant, spindle and hydraulic system pump motors.
  9. Down feed the wheel until it just touches the highest point on the work surface the grinding wheel can be set to the approximate position by down feeding it until it just "grab" a piece of paper placed between the wheel and the work-piece surface. This should be done before performing operation No, 8.
  10. Set the cross-feed to move the table in or out about 0.020 in at the end of each cycle.
  11. With the wheel clear of the work, down-feed about 0.001 to 0.003 in for average roughing cuts per pass of the work.
  12. Use light cuts of 0.0001 in for finishing the surface. It is wise to redress the, wheel for finishing cuts.
  13. When the work surface has been ground to the desired dimension and finish, use the following procedure to-turn off the machine:
    (a) Move the grinding Wheel clear of the work.
    (b) Turn off table travel.
    (c) Turn off coolant.
    (d) Let the grinding wheel run for a bit after the coolant has been turned off to permit the wheel to free itself of all traces of the fluid, otherwise, the wheel will absorb some of the fluid and become out of balance.
    (e) Use a sequence to remove excess coolant from the work. De-energize the chuck and remove the work. Be careful of the sharp edges on the work.
    (f) Clean the machine. Put a light coating of oil on the surface of the chuck to prevent possible rusting.
    (g) Replace all tools.

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