Mounting of boring bar
| - | Clean head, boring bar and sleeve. |
| - | Fit sleeve to head. |
| - | Align line on sleeve with line on head. |
| - | Fit boring bar to head/sleeve. |
| - | Align cutting edge with line on head. |
| - | Make sure that the boring bar is not protruding more than indicated by scribed circle on shank. |
| - | Tighten 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. |
| 6. | Retract boring bar 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
| Head for shank 12 mm | 6 Nm |
| Head for shank 16 mm | 6 Nm |
| Head for shank 20 mm | 6 Nm |
| Head for shank 25 mm | 6 Nm |
Torque for insert screws
| Insert size 06 | 0.6 Nm |
| Insert size 09 | 0.8 Nm |
| Insert size 11 | 0.9 Nm |
|
WARNING |
Setting without first unlocking the locking screw will result in damage to the tool. The same thing will happen if the setting limits are exceeded.
It is vital that the flat of the ball – not the sphere – is directed towards the cross-slide. Otherwise the cross-slide will be damaged. |
|
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 |
| TPMT 06T102 -- F | 0.07 | 0.3 | 0.05 | 0.10 |
| TPMT 090204 -- F | 0.10 | 0.5 | 0.05 | 0.15 |
|
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:
| 12 mm bar | 7000 rpm |
| 16 mm bar | 5000 rpm |
| 20 mm bar | 3500 rpm |
| 25 mm bar | 2500 rpm |
Cutting fluid
Cutting fluid must be used when finish boring to maintain close tolerances and 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. |
|