MITSUBISHI MATERIALS CORPORATION
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MZE,MZS Drill
CAUTION FOR USE
Spot facing as shown above is not possible due to large diameter not having a back taper. Please contact us if spot face drills are required. Chips from the chamfer machining tend to be elongated and may cause jamming. It is recommended to peck feed to reduce the length of chips. Cutting resistance increases on initial contact with chamfer. Reduce feed at this point. The width of the chamfer is C1.0 for M4-M6, and C1.5 for M4-M12.
For widths other than those stated above consultation is needed.

DRILL SIZE AND HOLE DIAMETERS FOR TAPPING
For Metric Coarse Screw Thread
Thread Size Initial Thread Diameter Tolerance MZE/MZS Drill Application Reference HSS Drill
max min
M2.5 x 0.45 2.138 2.013 2.1 2.1
M3 x 0.5 2.599 2.459 2.5 2.5
M3.5 x 0.6 3.010 2.850 2.9 2.9
M4 x 0.7 3.422 3.242 3.4 3.3
M4.5 x 0.75 3.878 3.688 3.8 3.8
M5 x 0.8 4.334 4.134 4.3 4.2
M6 x 0.1 5.153 4.917 5.1 5.0
M7 x 1.25 6.153 5.917 6.1 6.0
M8 x 1.25 6.912 6.647 6.8 6.8
M9 x 1.25 7.912 7.647 7.8 7.8
M10 x 1.5 8.676 8.376 8.5 8.5
M11 x 1.5 9.676 9.376 9.5 9.5
M12 x 1.75 10.441 10.106 10.3 10.3
M14 x 2 12.210 11.835 12.0 12.0
M16 x 2 14.210 13.835 14.0 14.0
M18 x 2.5 15.744 15.294 15.5 15.5
M20 x 2.5 17.744 17.294 17.5 17.5
M22 x 2.5 19.744 19.294 19.5 19.5

Drill retention
Determining drill length
Drill insertion
Drill retention
Determining drill length
Drill insertion
Using a thrust-bearing type collet chuck, please clamp it securely. Be sure to ensure an A diameter that is D x 1.5 or more. Never retain the slot portion.
Drill run out at time of insertion
Appropriate coolant lubrication method (MZE type)
Coolant lubrication method
(MZS type)
Drill run out at time of insertion
Appropriate coolant lubrication method (MZE type)
Coolant lubrication method
The run out should be 0.03 mm or less. It is desirable to supply coolant at two (2) sites. Please also put coolant on the drill tip and middle portions. Coolant pressure should be around 0.5~1 MPa
(for less than ø5, 2~3 MPa).
The discharge volume should be around 1.5~4.0 l/min.
How to use a small diameter drill
Coolant precautions
Thin-plate boring
How to use a small diameter drill

(1) For the prepared hole, use an MZE-SB type or a commercially available center drill, and open the hole to around 1D (D is the drill diameter).
(2) Using the provided hole as a guide, we recommend that you drill with a coolant hole-provided drill using stepped drilling (joggling) or inching.		 <When using the MZS type>

1) Always be sure to use a coolant filter, as cutting dust or other foreign matter could clog up the coolant hole. Especially when using a small diameter drill, please be sure to use a filter with a narrow (fine) mesh.

2) When the cutting fluid is old, small bits of foreign matter floating in the fluid become attached to the inner portion of the coolant hole, thereby causing poor discharge. Please change the cutting fluid early and often.
Thin-plate boring
Interrupted cutting
Stepped drilling (Joggling)
Burrs and chips at time of full penetration of work piece
Interrupted cutting
 Stepped drilling (Joggling) Burrs and chips at time of full penetration of work piece
(1) Divide the job into two (2) processes.
(2) First drill the wide diameter portion.
* Mitsubishi Materials makes counterboring tools and tools with chamfering edges. 		(1) Lower the feed at the time of penetration.
(2) Attach a chamfer angle.
(3) Change the point angle.

Special precautions when using an MZS type of ø3 or less
  • To prevent blocking of the coolant hole, please use a fine-mesh filter (with mesh of 3 µm or less) for the coolant unit.
  • For deep boring exceeding 1/d = 3, we recommend that you first drill a guide hole (for the guide hole, please use the MZEXXXXSB type).
  • Stepped drilling is also effective in this case.

Drill speeds according to grade
  • AP15TF: low & medium speed ranges
  • GP20M: medium & high speed ranges
Tools to be used: MZE1000MA, MZS1000MB  Drill depth: 30 mm  Feed: 0.25 mm/rev  Coolant: Water soluble emulsion  Density: 10%  Pressure: 0.5 MPa

Carbon steel: S50C (200 HB)
Alloyed steel: SCM440 (330 HB)
Ductile cast iron: FC450 (450 N/mm2)
Carbon steel: S50C (200 HB) Alloyed steel: SCM440 (330 HB) Ductile cast iron: FC450 (450 N/mm2)

Cutting resistance
Workpiece: SCM440 (300 HB)  Cutting speed: 50 m/min

Power consumption
Torque
Thrust
Power consumption Torque Thrust

Internal coolant lubrication method
Internal coolant lubrication method
When using an internal coolant type drill, tiny chips enter into the coolant hole; this may possibly cause blocking of the coolant hole.
Always be sure to use a filter for the coolant unit.