Construction/Main Parts of Universal Grinding Machine

Construction/Main Parts of Universal Grinding Machine Points : Construction/Main Parts of Universal Grinding Machine, Wheel Head I Wheel Stand Assembly, Internal Grinding Attachment or Fixture, Headstock, Footstock, Swivel Table, Longitudinal Table Travel, Cross Feed Some of the principal setup adjustments and operating controls are explained in the following paragraphs. Study the illustrations very carefully to note the positions of the parts. 1. Wheel Head I Wheel Stand Assembly The wheel stand which supports the wheel spindle and the wheel-spindle motor is adjustable along the platen, to which it is secured by bolts in both platen T-slots. The stand is used most often in a forward position on the platen, but sometimes it must be moved back during the grinding of large diameters and in face grinding with the face chuck. The wheel may be mounted between the bearings or at either end of the spindle. The spindle motor is attached to a plate adjustable along the stand to regulate the tension in the driving belts. Adjustments are made by a screw knob directly connected at the rear of the motor plate. 2. Internal Grinding Attachment or Fixture This attachment/fixture is used with the Universal under to do internal grinding jobs. The fixture is held in place on the rear of the platen by a single bolt, which allows it to be swiveled slightly. To bring the mixture into operating position, the platen is swung halfway around (180°). 3. Headstock This unit can be moved longitudinally, along the swivel table and is clamped in position by two bolts, one on either side of the base. It is aligned by the front lip of the base, which bears for its entire length on the, Front edge of the table. Start-stop and jog control is by means of a knob on the top of the main motor-switch control box at the left front of the machine bed. 4. Footstock Like the headstock, this unit can be moved longitudinally along the swivel table and is clamped in position by a single bolt in the center of the base. 5. Swivel Table The swivel table pivots about a central stud and is clamed to the sliding table by a clamp bracket and two bolts at each end. A plate on the right hand clamp bracket has three graduated scales for setting the table at an angle to grind slight tapers. The inner scale gives the taper in degrees and reads half the included angle by 5 (minutes). graduations; the middle scale gives the taper in inches per foot and reads the included angle by sixteenths of an-inch graduations; and the outer scale gives the taper in per. cent and reads the included angle by half-percent graduations. To facilitate setting the table at an angle, there is both a coarse and fine adjustment. 6. Longitudinal Table Travel For proper operation, the table is hydraulically driven with the oil-operated cylinder fastened to the underside of the table and the pistons fastened at each end of the bed. For manual operation, a gear on the table hand wheel shaft engages the rack on the table through intermediate gearing. Any desired rate of table travel from 76.2 to 3810 mm (3 to 150 in.) per mm. for grinding and wheel truing can be selected by means of the table speed selector knob. 7. Cross Feed The grinding wheel is fed to the work by hand or power as determined by the engagement of the cross feed control lever. For power operation, the cross-feed hand-wheel is rotated slightly to the left, enough to release the switch operating slide. To engage the feed throw the cross-feed control lever to “start.”