Page 69 - HOLE MAKING CATALOG p185-310

USER GUIDE DEEP DRILLING - BTA SYSTEM

Technical Information -
Cartridge Style Counter Boring Head Diameter Settings

The drill head diameter is set and inspected with a master insert in our final inspection.
However, the inserts in the market have a tolerance fluctuation so each time you change or
index the insert, the diameter must be adjusted as per the following method.
Note: When a corner change is made on the insert, it must be adjusted to the correct
size or damage can be caused to the head body or work piece material.

1. The dimensional guide pad must be slid forward to measure the diameter.
1.1 Loosen the lock screw and slide the guide pad forward.
1.2 Retighten the lock screw at the measuring position.

2. Measure the diameter with a micrometer. We recommend setting the tool
diameter at h8 tolerance to the cutting diameter.
Note: If the diameter is incorrect, go to step 3. If it’s correct, go to step 4

3. Adjust the outer cartridge
3.1 First loosen the lock screw of the outer
cartridge and then tighten it slightly.

3.2 Proceed to adjust the diameter, using the 2 adjustment
screws and measure with a micrometer.

3.3 When set to the size, re-tighten the lock screw.
3.4 Recheck the diameter with a micrometer. If it is still out of tolerance,

repeat the procedure from step 3.1.
Note: Please make sure to tighten the lock screw firmly
before using. If loose, the cartridge may move and
cause serious problems during machining.

4. Slide the dimensional guide pad back to the original position
and tighten the lock screw.
Please check all the lock screws are firmly tightened as they
may come loose if vibration occurs during drilling.

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