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Advantages of the Chipbreaker
Chipbreaker GM GH SM
Insert
1st. recommendation for carbon steel 1st. recommendation for interrupted Suitable for sticky materials such as
and alloy steel,1st. recommendation machining and hard materials. stainless steel and low carbon steel
for cast iron. Cutting edge strength oriented design.
Advantages
Good balance of sharp cutting Middle to high feed rates of steel
Sharp cutting, prevents chattering.
and cutting edge strength machining, GM Chipbreaker alternative For low to medium feed rates of steel.
Outer edge Cross-section
Chips from
Outer edge
Wide chipbreaker
Inner edge Cross-section
Chips from K
Inner edge
Flat chipbreaker
Workpiece Materials C50 (S50C) C50 (S50C) X5CrNi18 10 (SUS304)
Indication of tool life of MagicDrill
How to judge tool life Indication of judging tool life Drilling
Generation status of tool mark • When an insert is new,
involving with insert wearness A holder is slightly bend external side during cutting. (It is designed that cutting diameter is slightly bigger during
cutting.) Once cutting is nished, a holder will be back to normal size and smaller than cutting diameter. Tool mark
Tracing cutting diameter will not be appeared on the nishing surface. (Although depends on workpiece and cutting condition, cutting power
which generates external direction, slightly tool mark might be appeared.)
• When an insert is at the end of tool life,
Gradually external corner part is getting wear, cutting resistance which is generated in inside, a holder will be not
bend, on the contrary it will be bend inside. Once cutting is nished, a holder will be back to normal. Pulling off a
holder under this condition, external edge touches on nishing surface and tool mark will be on its nishing
surface.
When cutting diameter is measured, suddenly it shows small diameter.
In this case, an insert can be judged the end of tool life.
Generating status of at the exit side If insert wear progress. Burrs of penetrated hole entrance (Pulling out burrs) will be bigger and identied as the
insert has reached at the end of tool life.
Variation of cutting noise Light cutting noise at the beginning turns to brady noise which contains vibration noise.
Variation of vibration As the end of tool life is getting closer, vibration is getting larger and cutting noise is getting change. However, same
Caution as vibration and cutting noise, it is difcult to identify for small cutting diameter type.
When drilling through the workpiece, a disk may
be ejected. Proper machine guarding is necessary
to prevent injury.
The safety cover is necessary for the conventional
lathe machines to prevent any accidents.
Disk
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