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Information
Technical Information
Drilling
Magic Drill Set-Up for Lathes
Installation
The top face of the outer insert should be parallel to the X-axis
to allow for offset cutting.
It is recommended to set the outer insert as shown in Fig.1
with the outer insert facing the operator.
(It is also possible to use it by setting 180° reverse position.)
In case of the lathe with two turrets, when installing the drill to
the lower turret, the outer insert should be set so as to face
the operator.
(It is also possible to use it by setting at 180° reverse position)
Cutting Diameter Adjustment
1. Cutting Diameter Adjustment
Cutting diameter is adjusted by moving the tool in the X-axis direction.
The moving direction of the X-axis movement depends on the position of the toolholder.
For making the hole diameter larger, slide the tool along the X-axis toward the outer insert side. (Fig. 2, Fig. 3)
For making the hole diameter smaller, slide the tool along the X-axis in the opposite direction.
(This movement of the axis is called "Offset")
However, be sure not to make the hole diameter smaller than the drill diameter by 0.2mm (.008”) or more.
Otherwise, the toolholder will interfere with the drilled hole. (Fig. 4)
e.g.) when using 20 (.787”) drill, the hole diameter must not be smaller than 19.8mm (.780”) .
2. Offset Limit of the Cutting Diameter
For the maximum limit of the cutting diameter, refer to "Max. Offset (Radial)" in the Toolholder Dimension table.
(The figure in the table shows how much it is possible the offset the drill in the radial direction.)
e.g.) In case of using 20 (.787”) drill, it is possible to make a hole up to 2 (.827”) 1 since "Max. Offset (Radial)" is +0.5mm
(.02”) .
Center Height Adjustment
1. Center Height of the Inner Insert
When installing inner insert as shown in Fig. 1, it will be set around 0.2mm (.008”) below the
Center line of the Spindle. (Fig. 5)
This is the normal position of the center height and the inner insert is designed to be set at this
position.
However, in case that the turret of the lathe is out of alignment, sometimes the inner insert may
be above, or excessively below the center.
For stable machining, it is essential to check the center height of the inner insert carefully.
2. How to Check the Center Height of Inner Insert
For checking the center height of the inner insert, see the core which remains at the center of
the drilled hole. (Fig. 6)
If the center height is in the normal condition, a core of about 0.5mm (.02”) in diameter will
remain after machining.
In the following case, it is necessary to adjust the center height.
• No core remains
• Core diameter is more than 1mm (.04”)
For test cutting to check the center height, drill a shallow hole about 10mm (.40”) in depth at
83 low feed rate of less than 0.1mm/rev (.004ipr) .
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