Vibration Issues - LNS QUICK LOAD SERVO S3 Troubleshooting And Spare Parts Manual

Chapter 2: Common Issues

Vibration Issues

The term "vibration" is being used regarding the Quick Load Servo S3, to indicate that the RPM performance of the lathe is physically
deteriorated, to the point of creating an unbalanced rotational oscillation of the bar stock, within the confines of the spindle of the lathe
that is detrimental to the machining process.
Various items can cause or enhance a lathe spindle vibration issue, requiring the reduction of the spindle rpm to bring the anomaly
back to a normal controlled rotation. These items can be related to the material, the lathe, or the bar feed.
Material
The material must be reasonably straight. LNS has a specification of 0.5mm / meter (non-accumulative). Remember when running a
spindle liner for a Quick Load, the ID of the liner may be only 0.040" over the stock size (which is 0.5m per side). This means you may
not only have a vibration issue, but the material may also be caught in a bind as it is loaded through the liner, if it doesn't meet our
straightness specification.
If the material has been saw cut, the sharp edges and burrs must be removed
If the material is a hot roll type it may not meet our specifications.
If the material has been "cropped" to length the last 6"-12" of the end of the bar may be unusable due to being bent severely in the
process.
Note: Also, there is a possibility to have a severe angle on the end of the bar,
which has been cropped. This can lead to mis-positioning during part feed out,
depending on the surface area that the Quick Load's pusher is pushing against, as
the bar has rotated in it's orientation inside the spindle.
Lathe
The lathe should be level and on a solid foundation. LNS recommend that the lathe be bolted to the floor.
The headstock / actuator assembly should have minimal run out. *
Proper chucking device should be selected to match the machining application. *
The chucking device should have proper clamping pressure. *
The surface of the jaws or pads must make proper contact with the material. *
*Please reference OEM specifications.
Bar feed
The bar feed should be within proper alignment to the spindle of the lathe.
Since the pusher of the Quick Load is a fixed component and does not rotate, it cannot come in contact with the ID of the spindle or
with the rear of the bar stock unless the spindle is stopped.
Remember the pusher must also back off of the bar stock after the lathe's collet closes prior to the spindle rotating (refer to
Reversing Distance, pg. 3-24).
Spindle Liner
Ensure that the properly sized spindle liner has been installed (0.040" ideal gap).
Ensure the liner is straight (check total run out), and has all o-rings intact.
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Pusher
QUICK LOAD SERVO S3