Mitsubishi MWE „Checking conditions of the cutting edge, „Grinding first relief face, Fig.1, Fig.2, 140°, Horizontal, from the top, will become first relief angle

„Checking conditions of the cutting edge

•Check wear conditions of and damage to the cutting edge.

•If there is serious damage such as fracture on the cutting edge, grind the edge until the damage is all gone.

„Grinding first relief face

Fig.1	• Install the drill by using collet chuck. As
	shown in fig.1, set the drill phase in order
	that the corner of center cutting edge and
	Horizontal
	the shoulder of outer peripheral edge
	become parallel to each other when seen
	from the top.
	• As shown in fig.2, rotate the drill (work
Fig.2	head) 20°so that the point angle will be
	140°.
	ﾟ
	0
	2

9°～11°	• As shown in fig.3, set inclination angle of
	the drill (work head) at 9°~11°. This angle
	will become first relief angle.

図３

• Finishing first relief face on one side of the cutting edge, index the drill 180°and grind the other side until both sides are at the same position.

*Depth of cut is 0.02 ~ 0.03mm/path.

• Finally decrease depth of cut to about 0.01mm, and finish both sides at the position.

• For finishing, repeat oscillation 2 ~ 3 times as slow as possible. This also serves for the purpose of spark-out.

• Grind until there is no wear or fracture left on the cutting edge. (Please pay attention to the damage at the margin, too.)

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