2014-2015 Полный каталог инструмента Mitsubishi (Митсубиси) EN

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y OPERATIONAL GUIDANCE FOR THE MWS-DB TYPE LONG DRILL

  FLAT FACE DRILLING aDrilling a blind hole                                      y 2. Initial cutting with the long type drill

y 1. Drilling a pilot hole

z	U se a drill with a larger (flatter) point angle than the long type. The      z	P enetrate the pilot hole at a low revolution. (Cutting speed
                                                                                   20  30m/min, feed rate 0.2  0.3mm/rev)
  MWS-SB type is recommended.
x	E nsure a high precision hole is drilled for the guide.                       x	S top the long type drill 0.5  1.0mm short of the pilot hole bottom.
c	D rill depth : Approx 1D.
	 (Adjust the pilot hole depth according to the length of the long type drill.)

y 3. Drill the deep hole                                                         y 4. Drill retraction

z	S tart cutting at the recommended speed and feed with a non-peck              z	A fter drilling, lower the cutting revolution about 1  2mm short of the hole
  (continuous feed) cycle.                                                         end. (Cutting speed of around 20  30m/min)

                                                                                 x	R etract the drill to the pilot hole depth starting point at a feed rate of

                                                                                   3000mm/min.
                                                                                 c	F inally clear the hole at a cutting speed of 20  30m/min and feed rate of

                                                                                   0.2  0.3mm/rev.

INTERRUPTED DRILLING aDrilling and breaking through on irregular faces or angles

y 1. Spot facing                                                                 y 2. Drilling a pilot hole

z	M achine a flat on the irregular face by using an end mill or slot drill      z	U se a drill with a larger (flatter) point angle than the long type. The
  capable of spot facing. Make the spot face diameter the same size as             MWS-SB type is recommended.
  the required deep hole diameter.
                                                                                 x	E nsure a high precision hole is drilled for the guide.
                                                                                 c	D rill depth : Approx 1D.

y 3. Initial cutting with the long type drill                                    y 4. Drill the deep hole                                                            DRILLING

    z	P enetrate the pilot hole at a low revolution. (Cutting speed                 z	S tart cutting at the recommended speed and feed with a non-peck
       20  30m/min, feed rate 0.2  0.3mm/rev)                                         (continuous feed) cycle.

    x	S top the long type drill 1  3mm short of the pilot hole bottom.         y 6. Drill retraction

y 5. Breaking through                                                                z	F inally clear the hole at a cutting speed of 20  30m/min and feed rate of
                                                                                        0.2  0.3mm/rev.
    z	W hen breaking through, the cutting edge can be damaged.
    x	F eed rate should be half the normal feed.                                    x	R etract the drill to the pilot hole depth starting point at a feed rate of
                                                                                        3000mm/min.

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