27
PUMA 480LM
P48LMISE98
9.3 Parallelism between center line of spindle and Z-axis movement
In general, the parallelism should be measured using the test bar but it is rarely available
on site. Use an on-site workpiece as an alternative to the test bar.
1) Install a 400mm workpiece in the chuck that
you support using the tail stock. Then, perform
the rough cut on the workpiece before the
finishing cut.
2) Use the micrometer to measure the overall
length between two points (“A”, “B”).
If the difference between A and B is more
※
than 2mm, you should adjust the tail stock
accordingly.
In most case, the tail stock is at a higher
※
position.
3) Adjusting the tail stock position
Install the indicator on the tool holder of the
①
turret. While moving the Z axis, check the
X-axis deviations (normally, no deviation is
allowed) and set the end of the workpiece
to 0.
Close the hydraulic valve of the tail stock to
②
lower the oil pressure to 0. (This is to
prevent the tail stock from being pushed
back due to the oil pressure when loosening
the tail stock bolts.
Use the L
③
-wrench to loosen the bolts (4-BB
20×70) on the tail stock body.
If B is greater than A in step 2) above,
④
tighten the bolts so that the indicator
reads "+"; if not, tighten the bolts so that the indicator reads "-".
▪ Adjustment : half of the measurement
When done, tighten up the tail stock gib
⑤
before fixing the body bolts.
Turn the control valve to increase the oil pressure to a normal level.
⑥
Repeat steps above until you get a satisfactory result.
⑦
▪ Target: below 0.02 mm
Chuck
공작물 (Φ50×L400)
Hyd.
Pressure
Control
Valve of Tail
Stock
Chuck
공작물 (Φ50×L400)
“
A
”
“
B
”
Workpiece
(
Φ
50×L400)
Workpiece
(
Φ
50×L400)
