Darex XPS-16 Operating Instructions - Manual (Page 70)

70
X-Axis Loose
(Revised 012207)
Concerning the lost motion in the "X" axis, make
sure the Motor End Plate is not loose The plate is
secured by two M5 cap screws, PP12285FF. If
this plate is OK, then the other possibilities are a
loose Lead screw Nut or a loose Anchor Bearing
Assembly (see attached photo). Both are
difficult
to check. It will take about 2 hours to do this
work for the first time and much less after you
come over for training (about 30 minutes).
Most
likely, the Lead screw nut cap screws
(PP12252FF) are loose. Here is the procedure to
check them.
- The "X" axis stage will need to be removed .
With the machine ON and drill removed, press
the "TOOLS" icon and then the "BELT CHANGE"
icon. Power off and unplug unit after everything
stops moving.
- The following steps require access under the
machine so it needs to be safely raised on blocks
about 15 cm above the bench. Remove the Door
and Top Cover. Remove the Motor Access Cover
in back,
unplug motor leads, disconnect the
vacuum hose on the Grind Motor Shroud and
loosen the motor mounting screws. Hold the
Grind Motor, remove the screws, slip the drive
belt off and set the Grind Motor on bench.
- Disconnect the Step Motor lead and the Limit
Sensor lead at their respective connectors.
- Disconnect the Fiber optic cable from the
Amplifier by opening the cover, moving the lock
lever to down position and pulling the Fiber optic
connector out of the Amplifier. Remove the
clamp screws that hold down the amplifier
electrical cable. Remove the two
screws that
anchor the Amplifier to the Spindle Block.
Take the Amplifier and hang it over the back
of the machine.
- Remove the four M6 cap screws
(PP12277FF) that hold the Rail Supports in
the base of the machine. Lift the "X" axis
stage out of the machine and set it on some
foam pads.
- Back-out but do not totally remove the ten M2
screws that hold the Bellows to the Guide Cover
on the Step Motor end of the stage. Turn the
screws with a ball-style driver and stop when the
screw detaches from the Guide Cover. Leave the
screws in the Bellows and metal Frame to
maintain alignment.
- Push the Bellows back and look inside to
determine the cause of the looseness.
- If the lead screw nut cap screws are loose then
follow the remaining procedure. If the Lead
screw nut cap screws are not the issue, then let
us know what you have found.
- Remove one of the cap screws, apply a very
small amount of thread lock compound to the
thread and re-install but do not tighten. Repeat
for the other two cap screws.
- Turn the Lead screw by hand to move the
Linear Guide closer to the Step Motor end of the
stage. Continue the motion until there is still
enough room to access the cap screws (with a 90
degree wrench) while the Bellow is compressed.
The purpose of this is to align the lead screw nut
with the center of rotation of the Anchor Bearing
assembly. Now tighten the cap screws until they
just remove all of the clearance and then tighten
another 30 degrees. Do not over tighten as it
may distort the lead screw nut and cause jerky
motion. Turn the Lead screw and re-center the
Linear Guide.
- Replace the Bellow screws and re-install the
stage in the machine (hold the black plastic dust
shield back about 1 cm during insertion ). Install
the Rail Support screws and tighten. Re-connect
the Step Motor and Limit Sensor cables. Re-install
the Fiber optic Amplifier and cable clamp screws.
Re-insert the fiber optic cable into the Amplifier
making sure that the single fiber leg is the one on
top. Lift the locking lever and close the cover.
- Re-install the Grind Motor and Drive Belt. The
proper belt tension is the amount created by the
motor weight. With the motor mounting screws
1/4 turn loose, lift up slightly on the back of the
Trouble Shooting Section