MITSUBISHI MATERIALS CORPORATION
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MZE/MZS DRILL APPLICATIONS INFORMATION
Usage recommendations
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.0012 inch 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 72.5~145 Psi(for less than ø.097, 290~435 Psi).
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)
(1) Divide the job into two processes.
(2) First drill the wide diameter portion.
* Mitsubishi Materials makes counterboring tools and tools with chamfering edges. 		Burrs and chips at time of full penetration of work piece
(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 ø.118 or less
  • To prevent blocking of the coolant hole, please use a fine-mesh filter (with mesh of 118.11µinch 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
  • VP15TF: low & medium speed ranges
  • GP20M: medium & high speed ranges

Tools to be used: MZE1000MA, MZS1000MB  Drill depth: 1.18 inch  Feed: .0098 inch/rev  Coolant: Water soluble emulsion  Density: 10%  Pressure: 72.5 Psi


Carbon steel: 1049 (200 HB) Alloyed steel: 4140 (330 HB)
Carbon steel: 1049 (200 HB) Alloyed steel: 4140 (330 HB)
Ductile cast iron: 60/40/8 (450 N/mm2)
Ductile cast iron: 60/40/8 (450 N/mm2)
Cutting resistance
Workpiece: 4140 (300 HB)  Cutting speed: 1968.5 inch/min
Power consumption Torque
Power consumption Torque
Thrust
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.