20 Operation and Maintenance Manual
MQ-150 Ballscrew Feed Unit
3.
Remove (4) socket head cap screws from inside of feed housing #749-903 and
carefully remove housing. Use caution as this part is heavy. Removing
spindle motor mount #749-908 will help reduce the weight. To do this simply
remove (4) socket head screws on legs of motor mount and lift motor mount
upwards.
4.
Turn unit so that bottom of unit base plate #749-905 is exposed. Remove (4)
socket head cap screws in bottom of base. With a rubber mallet, carefully tap
on flanges of base to loosen base from unit. When base is free from (2) dowel
pins, you may safely remove the base.
5.
With the underside of the quill exposed, remove the anti-rotation cam roller
#12-633-2 using a flat head screw driver. Remove the cam roller and the
bushing #12-149-9 inside the bumper #749-914. NOTE: The bumper will not
be able to be removed at this point. When the quill is removed, this bumper
will be able to be freely dropped out.
6.
You can now freely pull the entire ball screw and quill assembly out of the
back of the unit.
7.
If this assembly needs to be disassembled further for bearing change or ball
screw replacement, follow the instruction below.
Disassembling quill and ball screw assembly
1.
To remove quill #749-910, remove set screws #12-525-16 and using strap
wrench, unthread quill from ball screw. See note below.
2.
Remove lock nut #10-727-5 and pull bearing #10-0251-2047-7, spacer #749-
916, pulley #749-929, spacers #749-915 & 749-916 and metallic seal ring
#11-615-1 off of ball screw shaft.
3.
Pull angular contact bearing pair #10-0301-9072-3 off of ball screw shaft
using proper pulling equipment. This assembly is now fully disassembled.
NOTE:
Thread connection between ball nut and quill is left hand, disengage
accordingly. Set screws must be removed first and strap wrenches only should be
used to loosen ball screw nut from quill.
CAUTION
: Leave ball screw nut on ball screw shaft at all times.
Replacing anti-rotation cam roller
1.
See step 4 & 5 in
Replacing quill and ball screw
above
Replacing spindle pulleys and belt
1.
Remove (4) screws holding outside half of belt guard #749-924 and remove
guard.
2.
Remove (2) top button head screws #12-525-18 and washers in slots securing
front guard #749-925 to spindle motor mounting bracket #749-908.
3.
Loosen (4) socket head cap screws #12-525-15 on side of unit holding spindle
motor mounting bracket legs to unit.
4.
Loosen (2) locknuts and lower (2) jackscrews #12-525-20 attached to top of
feed housing #749-903 to lower spindle motor mount and loosen belt.
5.
Remove belt.
