Page 77 - HOLE MAKING CATALOG p185-310

USER GUIDE DEEP DRILLING - BTA SYSTEM

Technical Information -
Cartridge Style Trepanning 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.

1. 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.

2. The dimensional guide pad must be slid forward to measure the diameter.
2.1 Loosen the lock screw and slide the guide pad forward.
2.2 Re-tighten the lock screw at the measuring position.

3. Measure the diameter with a micrometer.
We recommend setting the tool diameter at h8 tolerance
to the cutting diameter.
If the diameter is incorrect, go to step 4
If it’s correct, go to step 5

4. Adjust the peripheral cartridge
4.1 First loosen the lock screw of the peripheral
cartridge and then tighten it slightly.

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

4.3 When set to the size, retighten the lock screw.
4.4 Recheck the diameter with a micrometer. If it is still out of tolerance,

repeat the procedure from step 4-1.
Please make sure to tighten the lock screw firmly before using. If loose,
the cartridge may move and cause serious problems during machining.

5. Slide the dimensional guide pad back to the original
position and tighten the lock screw.

6. Replace the inner cartridge and tighten the lock screw.
Please check that all the lock screws are firmly tightened as
they may come loose if vibration occurs during drilling.

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