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Suitable Chipbreaker (ZXMT) How to select ZXMT03
Workpiece Insert ZXMT type ZXMT03 type (Cutting Dia : 12 ~ 13)
Material
Chipbreaker GM GH SM 1) For outer edge, please select "-E" insert from three different
chipbreakers for each application.
Cutting Depth 2D 3D 4D 5D 2D 3D 4D 5D 2D 3D 4D 5D
2) For inner edge, please select "-I" insert (GM chipbreaker only).
Low-carbon Steel
Carbon Steel Outer Inner Edge
edge
Alloy Steel
Mold Steel
Stainless Steel
Cast Iron ZXMT030203 -E ZXMT030203GM-I
GM-E GH-E SM-E GM-I
Aluminum Alloys
Brass
Titanium Alloys
: 1st Recommendation : 2nd Recommendation
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 K
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 Drilling
Outer edge
Wide chipbreaker
Inner edge Cross-section
Chips from
Inner edge
Flat chipbreaker
Workpiece Materials C50 (S50C) C50 (S50C) X5CrNi18 10 (SUS304)
Indication for tool life of MagicDrill
How to judge tool life Indication for judging tool life
Judgment of tool condition and • When an insert is new the holder is slightly bent to the side during cutting (therefore,the cutting diameter is slightly
insert wear bigger during cutting). Once cutting is nished, the holder will return back to normal size. No tool marks will appear
on the nished surface (although this depends on workpiece and cutting condition: during external machining slight
Checking cutting diameter tool marks might appear).
Checking the surface on the
• When an insert is at the end of its tool life, Gradually the external corner part gets worn out, the holder does not
exit side bend slightly outwards - it starts to bend inwards. After the cutting is nished, the holder returns to the normal
Variation of cutting noise position. When taking off a holder under this condition the cutting edge of the insert creates external tool marks on
the nished surface of the workpiece.
Variation of vibration
When cutting diameter is measured, suddenly it shows small diameter.
In this case, a worn out insert can be the cause.
If insert wear progresses the burrs of penetrated hole entrances become bigger. This is a clear indication that the
tool must be exchanged.
Light cutting noise at the beginning turns to brady noise which contains vibration noise.
As the end of tool life is getting closer, there is more vibration and the cutting noise changes. However, when
machining smaller diameters these factors are difcult to detect.
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