Chuck Mounting By the use of the American Long Taper Key Drive spindle nose, the danger of chucks and other work holding fixtures becoming loose whilst rotating has been eliminated, but care must be taken to ensure that chucks, etc., are driven home firmly by means of the special key provided with the standard equipment. Both chuck and spindle tapers must be thoroughly cleaned before mounting. It is most important to avoid damaging any part of the spindle nose or chuck taper, as burrs will prevent the chuck being fully tightened. Leveling Leveling is more satisfactorily carried out by means of steel wedges inserted where necessary underneath the lending edge of the cabinet base.
Care must be taken not to raise any part of the base unnecessarily high but if this condition is evident due to unevenness of floor surface, wedges should be inserted to ensure complete contact between edge of cabinet base and floor. Following correct leveling, the lathe should then be bolted down and grouted in if necessary. Turning Tests The leveling procedure will put the machine into accurate alignment for all normal work, but sometimes-turning tests are taken to check alignment and to establish a greater degree of accuracy when the machine is to be employed on Toolroom work. These turning tests must be taken with keen tools taking a very light cut.
' At our plant these tests are taken on two discs held 12" apart in a chuck and as shown in sketch. A very light cut is taken on Disc A and B. Micrometer readings of the two discs should be the same. Similarly a bar can equally well be used for this test. Any discrepancy can be corrected by adjusting the leveling screws until half the difference between the collar diameters has been eliminated on a dial indicator reading. Check by repeating the test.