Bangalore, Karnataka, India
Our Product / Services
Press the pivot pin in the bore, provided on the tool shank. Position the wing in the pocket through the pivot pin. Screw on the pivot screw through the tapped hole till its point enters the cone, provided in the bottom of the wing. Tighten the pivot screw till the clearance between the pivot pin and pivot screw is just sufficient for the wing to freely swing in and swing out of the pocket, at the same time avoiding any axial and radial play. Lock this position by tightening the lock screw through the aluminum binder. It is advisable to release the pivot screw by about 30% before locking, so as to nullify the possible thermal expansion during cutting. Do not over tighten the insert clamping screw. Solid HSS wings are with integral pivot pin. Regrind the blunt cutting edges of HSS wings.
Make the axis of guiding pilot shank of the automatic rear counter boring tool true to the axis of the pilot hole. Use cotter / drive-key for preventing the tool from falling down while cutting. The back spot facing tool enters the pre-drilled pilot bore in an anti-clock wise rotation of the spindle. The wing is so designed that even if it is open, it folds into the pocket on touching the job in anti-clockwise rotation. After the wing come clear of the pilot bore in anti-clock wise rotation, reverse the spindle rotation to clockwise; due to centrifugal force, the wing automatically opens up; with feed it cuts. After the spot facing is over, take the back spot facing tool little away from the job; then reverse the spindle rotation to anti-clockwise and pull the automatic back spot facing tool out of the bore. The wing automatically folds into the pocket on coming in contact with the job in anti-clockwise rotation.
Tools for this range of back spot facing are generally with HSS wings and feed rates of 0.05 & 0.03 mm per rev. in CI & MS are generally recommended. For the rest, 0.2 and 0.15 mm per rev in CI & MS, respectively are recommended, since Carbide inserts are generally used in this range. Cutting parameters depend on machine condition, clamping rigidity, hardness of job etc. For intermittent cutting, spindle speeds may almost be doubled, while feed rates are to be reduced by 30%. These are indicative parameters. Actual parameters are to be established only by trial and error.
| SPOT FACE DIA (in mm) | SPINDLESPEED (RPM) | SPOTFACE DIA (in mm) | SPINDLE SPEED (RPM) | SPOT FACE DIA (in mm) | SPINDLE SPEED (RPM) |
| 9 to 11 * | 575 | 18to 21* | 285 | 36 to 45 | 320 |
| 12 to14* | 450 | 22 to 25 | 550 | 46 to 55 | 260 |
| 15 to17* | 360 | 26 to 35 | 450 | 56 to 65 | 215 |
