F-18 PREPARATION BEFORE STARTING MASS PRODUCTION
7
CHECKING THE PROGRAM WITH A WORKPIECE CLAMPED IN
THE CHUCK
To check the program (tool paths) by executing automatic operation (dry run operation) with a
workpiece clamped in the chuck, shift the coordinate system before executing the program.
The direction and the amount to shift the coordinate system vary depending on the workpiece.
In this section, the procedure used to check the program with the dry run function by shifting the
coordinate system in Z-axis direction is described.
There are variety of types of workpieces which are machined by the customer.
Chucking methods will vary according to the workpiece type as well. Therefore, when
checking the program with a workpiece clamped in the chuck, pay sufficient attention to
interference, taking the workpiece shape and chucking method into consideration.
<Example>
To carry out dry run operation by shifting the coordinate system 100 mm in the +Z-axis
direction
The clearance between the tool nose and the end face used for obtaining the tool offset data is:
[Shift amount (100 mm)] + [Z-coordinate specified in the program]
[allowance on end face]
1.
Make sure to set "0" for the work coordinate system "COMMON Z" on the WORK
OFFSET screen. If the work coordinate system shift data is set for "COMMON",
the work coordinate system is shifted in the same direction disregarding of the
spindle (spindle 1 and spindle 2) to be used, which causes the turret to interfere
with the workpiece resulting in machine damage. (S type)
2.
When shifting the coordinate system, determine the appropriate shift amount
taking the workpiece shape and conditions into consideration. When a blank
workpiece is used for program check, for example, the cutting tool may strike the
workpiece if the shift amount is insufficient.
3.
When executing dry run operation by shifting the work coordinate system, pay
attention to the interference of the cutting tool with the tailstock etc.
CAUTION
Shift amount = 100 mm
Clearance to be
checked with a scale
Workpiece zero point
(X0, Z0)
End face used for obtaining
tool offset data
Allowance on end face
Workpiece zero point
for dry run operation
Programmed commands
(absolute value)
CAUTION
