Bolton Tools ZX45A Operating Manual page 11

(b)The spindle bearing is worn, or is fixed too tight---Turn off the
power, unplug the electrical connection, and rotate the spindle
by hand.Be sure it freely. If not, adjustment the bearing .If you
feel no use in the bearing, you will have to replace it.
(c)The spindle has been turning at high speed for a long time---After
Long use, turn the machine off for a while to give it a rest, and
allow it to cool off.
4.Table travel is not balanced
(a) The gap of the table guide is too wide or feel a heavy drag when
moving the table---Adjust gib strip in proper
(b) The locked bolts may be loose---Check and tighten them if
necessary.
(c) The feed is too deep---Reduce the depth of cutting, make several
passes to reach the required depth.
5.There is vibration, and roughness of working surface
during performance.
(a)The gap of spindle bearing is too wide---Adjust the gap in proper
or replace bearing with new one.
(b)Spindle loosening up and down---Check the adjustment of the two
inner bearing covers. adjust them so there is no free play in the
taper bearing, and the bearing turns freely. Tighten them against
each other to save this adjustment.
(c)The gap of the taper sliding plate is too wide---Adjust the bolt
tension.
(d)The chuck is loose---Tighten the chuck.
(e)The drill bit or cutter is dull---Sharpen or replace it.be sure
to use cutting fluid to preserve tool life.
(f)The workpiece is not held firmly---Check the clamps or vise you
are using, and assure to tighten the workpiece
6.The micro feed does not work smoothly
(a)The clutch may be loose ---Check this and tighten if necessary.
(b)The worm or worm shaft may be worn---Check these and replace if
necessary
(c)The handwheel fixed screw may be loose---Check it and tighten
if necessary.
7.The workpiece is not machined accurately
(a)Imbalance of heavy workpiece---Check to see that heavy workpiece
are held in balance. the workpiece Out of balance may shift when
being machined
(b)A hammer has been used on the workpiece---never strike the
workpiece with a hammer.
(c)The table may not be level---check the table with a level to be
sure it is level both side to side and front to back.
11