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XYZ Machine Tools Ltd
XYZ Bed Mill Safety, Installation, Maintenance, Service & Parts List Manual
4.2.1
Keys to SMX 2500 & 3500 Ball Screw Alignment
X-axis – there are 3 components that can cause misalignment: the yoke, the left side bearing
housing bracket, and the right side bearing housing.
o
Yoke – the yoke is aligned at the factory and pinned in place. It is aligned to within 0.01mm
with a precise alignment tool. The yoke most likely is not causing the problem. If this were
the problem you would need to remove the pins and align the X ball screw with the back of
the saddle. Drill new holes and pin the yoke in place. The Y-axis ball screw bore is
machined perpendicular to the X bore. If the X-axis is aligned the Y-axis will also be aligned.
o
Left side table bearing housing – this is most likely the cause of the misalignment. To
align the bracket and bearing housing, move them as close to the yoke as possible. Loosen
the bracket bolts and bearing housing bolts and then retighten. This should allow the
bearing housing to align itself up with the yoke.
o
Right side table bearing housing – once again move the bearing housing as close to the
yoke as possible. Loosen the bearing housing and retighten. This should allow the bracket
to align itself. If you do not move the table toward the yoke the ball screw will tend to bend
down slightly and cause misalignment.
Y-axis – the only component that can cause a misalignment problem is the motor mounting
bracket. To align this bracket, move the saddle as far to the front of the machine as possible.
Loosen the bracket and then retighten it. Once again moving the saddle forward allows the yoke
to be as close to the bearing housing as possible.
4.2.2
Keys to SMX 4000 & 5000 Ball Screw Alignment
X-axis – there are 3 components that can cause misalignment: the yoke, the left side bearing
housing bracket, and the right side bearing housing. This machine has 2 separate yokes for the X
and Y-axis. The yoke is bolted to the table on the X-axis.
o
X Axis Yoke – the yoke is aligned at the factory. If you suspect the yoke is misaligned, the
bolts for the yoke can be accessed from an opening on the bottom left side of the saddle.
Break these bolts free and move the table back and forth along its travel and then retighten
the bolts.
o
Left side table bearing housing – To align the bracket, move the yoke (table left) as
close to the bracket as possible. Loosen the bracket bolts and then retighten. This should
allow the bearing housing to align itself up with the yoke.
o
Right side table bearing housing – once again move the yoke as close to the bearing
housing as possible (table right). Loosen the bearing housing and retighten. This should
allow the bracket to align itself. If you do not move the table toward the yoke the ball screw
will tend to bend down slightly and cause misalignment. Make sure the mechanical
handwheel is not causing the misalignment.
Y-axis – the only component that can cause a misalignment problem is the motor mounting
bracket. To align this bracket, move the saddle as far to the front of the machine as possible.
Loosen the bracket and then retighten it. Once again moving the saddle forward allows the yoke
to be as close to the bearing housing as possible.
4.3
Computer/Pendant Diagnostics
The pendant consists of 2 separate modules: the computer module and LCD screen/enclosure.
In general, the pendant/computer module is best diagnosed by eliminating all other possible alternatives.
The following table lists some problems and what these problems can lead to.
Possible problems
Check This:
Poor cable connections
There are 6+ cable connections to the left side of
the pendant. Make sure all cables are properly
secured.
