Re: [CAD_CAM_EDM_DRO] cutting speed and feed for 3/4" dovetail cutter

Sorry all yes I have milled out the pocket first and
the steel is D2 tool steel only one part is so I
thought I should get that done first and the cutter is
a 3/4 "8 flute

John
--- Jon Elson <jmelson@...> wrote:

>
>
> marble_h@... wrote:
>
> > Can anyone tell me what the feed and cutting
> speed is for it
> >
> > I have been cutting at 160 rpm's and a feed of
> .002 per rev but I
> > snapped the cutter ,boy $59.00 down the drain and
> I have 15 more cuts
> > to do..
>
> What is the diameter? How many cutting edges? What
> is the
> tool made of (HSS, I'm guessing)? What is the
> workpiece material?
>
> You first figure the correct surface speed in
> Feet/Minute, based on
> tool and work materials. For HSS cutters on mild
> steel, it is about 100 SFPM.
> For HSS on aluminum alloy, it is 600 or so.
>
> Now, a dovetail cutter has a varied diameter, so you
> have to come up
> with a compromise speed. But, using the widest
> diameter of the cutter
> should be good. RPM = SFPM * 12 / (diameter * Pi)
>
> For 100 SFPM with a 2" cutter, the RPM should be
> about 190.
>
> Now, most dovetail cutters have a lot of cutting
> teeth. So, you take a
> guess at chip load per tooth, multiply by number of
> teeth, and RPM, and
> you get feed rate in inches/minute. So, for a
> 16-tooth cutter, and a chip
> load of .002"/tooth, you get feed= .002" * 16 * 190
> = 6 IPM.
>
> Now, one thing is you should mill the center of the
> dovetail out as far as
> you can with a standard end mill first, so the
> dovetail cutter only needs
> to remove the material under the dovetail itself.
>
> If you are doing this in aluminum or steel, you need
> to use a coolant to
> keep the cutter and work cool, and flush away the
> chips. Cast Iron is
> usually cut dry, or with a touch of cutting oil.
>
> Jon
>
>
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