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3. Center Height Adjustment
a) No Core or Cores with Small Diameter Drilling
This occurs when the inner insert is on or above the center.
In this case, adjustment is necessary since insert breakage is likely at the 84
center of the drill. (Fig. 7)
Adjustments
Install the drill rotated at the 180°. Most problems
will be solved by this method.
If the core diameter becomes too large after the
above adjustment, install the drill rotating 90°
counter-clockwise as shown in Fig.9 (outer insert
is positioned lower) and adjust the center height
by moving the tool in the X-axis direction.
(However, this makes it impossible to adjust
the cutting diameter.)
Caution: In case of installing the drill in the
opposite direction (outer insert is positioned
upper), the cutting diameter will become
smaller, which may cause the drill body to
interfere with the drilled hole.
The fundamental solution is to readjust the
center position of the turret itself.
b) Core with Excessively Large Diameter (More than 1mm/.04”)
This occurs when the inner insert is excessively below the center.
This condition causes poor chip evacuation and on adjustment is required.
Adjustments
Install the drill rotating 90° counter-clockwise as
shown in Fig.10 (outer insert is positioned upper),
and adjust the center height by moving the tool in the
X-axis direction.
(However, this makes it impossible to adjust the
cutting diameter.)
Caution:When installing the drill in the opposite
direction (outer insert is positioned lower), the cutting
diameter will become smaller, which may cause the
drill body to interfere with the drilled hole.
The fundamental solution is to readjust the center
position of the turret itself.
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