- 6 -
Fig.9
Fig.10
Fig.11
Fig.12
Table 1: Relationship of sleeve travel and
brush projection amount (mm)
Sleeve
travel
Projection
amount
3.142
6.283
9.425
12.566
15.708
18.849
21.991
25.132
28.274
31.415
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
Sleeve
travel
Projection
amount
34.557
37.698
40.840
43.981
47.123
50.264
53.406
56.547
59.689
62.830
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
X
Y
Z
Y
X
35
: XY-axes machine coordinates
centering position
: Travel of originating point position
: Brush projection travelling direction
Z
X
: XZ-axes machine coordinates
centering position
: XY-axes machine coordinates centering position
: Travel of originating point position
: Brush projection travelling direction
35
(3) How to determine sleeve travel with automatic projection amount
(2) Operating program
<Program example>
To have a +0.5mm automatic brush projection with the coordinates of racking gear
mounting positions and distance from the gauge line to the side gear as follows:
X-axis machine coordinates at the center of hole for centering : X-200.000
Y-axis machine coordinates at the center of hole for centering : Y-150.000
Z-axis machine coordinates at rack gear top surface : Z-514.000
Distance from gauge line to side gear : 136.5mm
!
!
Confirm without fail before operating via the program that the rack gear and side gear are
facing each other after completing the main-spindle orientation commands.
In the case of confirming operation initially, render it by reducing the moving speed adequately
and confirming that there is no interference with the work-pieces or jigs when approaching/allow-
ing relief on the rack gear.
<Sub program for automatic brush projection> ... Operation trajectory (Fig. 9)
G91G28Z0M9︔
...Retract to first origin in Z axis and coolant OFF.
G0G90G53X[-200.0+50.0]Y[-150.0+25.0]︔
...Position to X35.0 Y25.0 from the rack gear datum
hole/ centering hole. (X axis is at the travel start
position)(Fig.10)
G0G90G53Z[-514.0+136.5]︔
...Position to Z136.5 from the top surface of the rack
gear . (Z axis is at the position where the rack gear and
side gear mesh)(Fig.11)
M19︔
...Main spindle orientation command.
*1
G1G91X0Y-25.0F2000︔
...Feed into position with an incremental move in the Y
axis, feed rate 2000mm/min. (Y axis is at the travel
start position)
Y-31.415F10000︔
...Feed in the correct direction for brush projection for
31.415mm of travel from the start position,
*2
feed rate
10000mm/min.
*3
X15.0F2000︔
...Move away in the X axis direction still in incremental,
feed rate 2000mm/min.
G91G28Z0︔
...Retract to first origin in Z axis
M99︔
...Return to main program
!
*1 Set the main spindle orientation retention state by commanding main spindle orientation without fail before the
rack gear passing operation. Additionally, main spindle excitation torque in the retention state requires a torque
that exceeds 0.5N·m. There is the risk of possibly damaging the main body/rack gear/machine by having the main
spindle rotate at the time of passing the rack gear if it is not set.
!
*2 Please do not operate the main body in the brush draw-in direction (gear reverse direction) because the gear
and/or rack gear can break down. Tabel1 shows the relation of the main bodyʼs travel passing through the rack
gear and brush projection amount.
!
*3 There is the risk of causing failure and damaging the main body as well as the rack gear, damaging the machine, jigs
and work-pieces and/or sustaining an injury when used by exceeding the feed rateʼs upper limit (F=10000mm/min).
Projection direction
(Gear normal rotation)
OK
OK
Draw-in direction
(Gear reverse direction)
NG
NG
The starting point of the sleeve travel on Table 1 is where the spindle
of the sleeve main body is on the spindle of the rack gear starting
point and at the position located 35mm away from the point.
<Example 2>
<Example 1>
Case of brush to wear 0.05mm with processing
of one work-piece:
Sleeve travel on brushʼs automatic projection
amount 0.05mm is 3.142mm (refer to Table 1).
Case of brush to wear 0.2mm with processing of
100 work-pieces:
Sleeve travel on brush automatic projection
amount 0.2mm is 12.566mm (refer to Table 1).
