Surface Machining

[Beekeepr]

Hello

 

I am surface machining some D-2. 1/8em rough leaving .01 on drive, 3/32 finisher, 1/16 roughing an island leaving .003 on drive then it finishes island.I am getting 2 flute breakage on a 4fluted(1/16) ball. I have a 4"x.3w slot with .5x.16 island on one end. Slot is .250 deep,island .150 tall. Sorry for the confusion. Do I need a 2flute or 3 flute? Do I need to slow down? At F.008 PF.003. NEW territory 4 me!

[Dave-Newcastle]

1st i would check that your tool is running true, this could explain uneven wear/breakage.

[dolphin1]

i take it that the PF.003 is plunge,as for the .008 regular feed that sounds too high.try cutting it in half.also is this carbide or hss and what kind of speed.

[Beekeepr]

Plunge Feed yes, Carbide, 8000 rpm. Step down for 1/16 ball .010.

[Hardmill]

quote:

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I am getting 2 flute breakage on a 4fluted(1/16) ball.

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4 flute endmills and surface machining dont mix good.

Get yourself a good Tialn coated (2 flute) mill.

 

 

PEACE

[ReDEyZZ]

+1..... 4 flute endmills and surface machining dont mix good.

Get yourself a good Tialn coated (2 flute) mill.

 

also is 8000 your max ss? for finishing in that material i would try 12000+. If your e-mill is chipping or breaking crank up the speed till it starts wearing . .008" per rev too high, try .004" to .006"

 

my $.02

[Guest CNC Apps Guy 1]

I like 3 fl. RobbJack's only have 1 flut cutting at the center and evacuate chips VERY well.

 

JM2C