Part Feed Out Accuracy - LNS QUICK LOAD SERVO S3 Troubleshooting And Spare Parts Manual

Chapter 2: Common Issues

Part Feed Out Accuracy

Description:
The accuracy of the part positioning can be affected by many factors. Choosing the correct bar feed application and setting
the barfeed parameters correctly are crucial to ensuring the proper accuracy.
Part Setup Parameter:
1. Input overall part length (Located in: 1. Part setup menu)
The parameter determines how far the push rod will advance the barstock during a part feed out. This value should include
the finished part length, cut-off and facing. Otherwise, how much material must be fed out to make a complete part.
Application Selection: (Located in: 2. Application Setup)
1. Feed without help of the turret
This application requires that the lathe be equipped with a pull-to-close type clamping system. If a push-to-close type
clamping system is used then the "Feed with help of the turret" application must be selected. It is recommended by LNS that
when feeding without the help of the turret that a dead-length, parallel gripping type clamping device be used. This type of
clamping system will prevent the barstock from moving forward when the clamping device is closed, thus losing the
positioning accuracy.
2. Feed with help of the turret
This application can be selected when either a pull-to close or push-to-close type clamping system is installed but must
always be selected when a push-to-close type clamping system is installed. This is due to the barstock moving forward as
the draw tube pushes forward to close the clamping device.
For more information on setting up different applications see
Parameters related to clamping device: (located in: 4. Miscellaneous Functions menu)
1. Time for clamping device to close (Parameter 74)
Once the clamping device close signal is output from the lathe the barfeed will wait for the time entered in this parameter to
expire then the push rod will reverse off the back of the part.
If this time is set to low then the push rod may reverse before the clamping device is physically closed. When this occurs
with a pull-to-close clamping system then the push rod will not be in place to support the barstock as the clamping device
closes. The push rod can overcome the weight of the barstock moving in the draw tube but can not overcome the force of
the clamping device this is why a dead-length, parallel gripping type clamping device is recommended.
Setting this time to high will not effect the part positioning. However, if this time is set to high the push rod may not reverse
off the barstock before the spindle begins to rotate. This can create excessive noise and possibly damage the push rod.
2. Time for clamping device to open (Parameter 75)
Once the clamping device open signal is output from the lathe the barfeed will wait for the time entered in this parameter to
expire then the push rod will advance the part the distance programmed.
If this time is set to low then the push rod may hit the back of the clamping device before it is physically open. This can
cause a variation of unexpected results.
For further information on part feed out accuracy with special applications (i.e. Shaft Loading) please contact your local LNS
representative.
Chapter 5 - Bar feed Applications.
2 - 5
QUICK LOAD SERVO S3