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Suitable Chipbreaker (ZXMT) How to select ZXMT03
Workpiece Insert Type 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 · Outer · Inner
edge Edge
Carbon steel
Alloy Steel
Mold steel
Stainless Steel
ZXMT030203-E ZXMT030203GM-I
Cast Iron GM-E GH-E SM-E GM-I Magic Drill DRX
Aluminum Alloys
Brass
Titanium Alloys
: 1st Recommendation : 2nd Recommendation
Advantages of the Chipbreaker
Chipbreaker GM GH SM
Insert Drilling
1st. recommendation for carbon 1st. recommendation for interrupted Suitable for sticky materials
steel and alloy steel, 1st. machining and hard materials. Cutting such as stainless steel and low
Advantages recommendation for cast iron. edge strength oriented design. carbon steel
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 Chipbreaker
Cross-section
Wide chipbreaker Chips from
Outer edge
Inner edge
Chipbreaker
Cross-section
Flat chipbreaker Chips from
Inner edge
Workpiece Material S50C S50C SUS304
Indication of tool life of Magic Drill
How to judge tool life Indication of judging tool life
Judgement of tool condition ·When an insert is new the holder is slightly bent to the side during cutting. (Therefore, the cutting diameter is slightly bigger during
and insert wear cutting). Once cutting is finished, the holder will return back to normal size. No tool marks will appear on the finished surface.
(Although this depends on workpiece and cutting condition: during external machining slight tool mark might appear.)
·When an insert is at the end of its tool life, Gradually the external corner part gets worn out, the holder does not bend slightly
outwards - it starts to bend inwards. After the cutting is finished, the holder returns to the normal position. When taking off a holder
under this condition the cutting edge of the insert creates external tool marks on the finished surface of the workpiece.
Checking cutting diameter When cutting diameter is measured, suddenly it shows small diameter.
In this case, a worn out insert can be the cause.
Checking the surface If insert wear progresses, the burrs of penetrated hole entrance becomes bigger. This is a clear indication that the tool must be
on the exit side exchanged.
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, there is more vibration and the cutting noise changes. 26
However, when machining smaller diameters these factors are difficult to detect.
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