Mounting and setting of fine boring head 391.37B
with adjustable counter weight
Mounting of boring bar
| - | Clean head and boring bar. |
| - | Fit boring bar to head. |
| - | Align cutting edge with line on head. Make sure that boring bar is pushed all the way to bottom of head. |
| - | Tighten clamping screw. |
| - | Set counter weight. |
| - | Tighten counter weight clamping screw. |
Setting should be done in tool setter
| 1. | Mount insert. |
| 2. | Set tool setter to required diameter. |
| 3. | Place tool in tool setter. |
| 4. | Rotate tool to obtain largest diameter on display. |
| 5. | Unlock clamping screw of setting mechanism. |
| 6. | Retract cartridge by turning dial counterclockwise to facilitate setting from smaller to larger diameter. |
| 7. | Set diameter by turning dial clockwise. |
| 8. | Tighten locking screw. |
Torque for locking screws
Torque for insert screws
| Insert size 06 | 0.6 Nm |
| Insert size 09 | 0.8 Nm |
Setting of balance weight
| - | Unlock clamping screw of setting mechanism. |
| - | Select boring bar in table below. |
| - | Select diameter to be machined, see table  . |
| - | Find setting value. |
| - | Turn setting dial until setting value lines up with datum line. |
| - | Lock clamping screw. |
Example:
Boring bar R429.90-14-040-09-AC
Dc = 18.1 mm
Balance value = 56 |
|
| Scale for
balance setting |
| Datum line |  |
|
Insert, feed and depth of cut recommendations
for medium carbon- and low alloy steels
Insert | Depth of cut, mm | Feed, mm/rev |
| Min | Max | Min | Max |
| TCGT 06T102L - K | 0.07 | 0.3 | 0.05 | 0.10 |
| TCGT 090204L - K | 0.07 | 0.5 | 0.05 | 0.15 |
| TCGX 06T104L - WK | 0.10 | 0.3 | 0.05 | 0.20 |
| TCGX 090204L - WK | 0.10 | 0.5 | 0.05 | 0.20 |
|
The geometries above are suitable for finish boring and will perform excellently with the recommended cutting data. Unfavorable conditions e.g. thin work pieces, bad fixturing, worn spindle bearings and long overhangs can cause vibrations with unacceptable surface finish as results.
In order to avoid such conditions.
| - | Use insert with sharp cutting edge. |
| - | Use as small nose radius as possible, radius 0.2 mm is recommended. Radii larger than 0.4 mm should not be used! |
| - | Reduce cutting speed. |
Note! Do not combine maximum recommended depth of cut with maximum recommended feed.
Cutting speed
The maximum cutting speed is not as much limited by tool life as by vibration tendencies. Therefore “starting values” are recommended to be no more than 50% of that recommended for external turning. (Recommendations in main ordering catalog). Max rotation speed: 20 000 RPM
Coolant
Coolant must be used when finish boring to close tolerances and to achieve good surface finish, as well as:
- To transport chips quickly away from the cutting zone and out of the bore.
- To limit the heat-expansion of work piece and tool. |
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