Re: chipload

--- In CAD_CAM_EDM_DRO@y..., "keongsan" <keongsan@y...> wrote:

> --- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:
> > Chip load is generally the thickness of the chip, and is
> approximated in practice
> > by the "feed per tooth". So, if a 4-tooth cutter is turning at
> 1500 RPM, and
> > the feed is 15 IPM, then you have a feed per rev of .01", and a
> feed per tooth
> > of .0025". Small end mills may use a feed per tooth of .0007", a
> 1/2" end mill
> > might use .005" feed per tooth on aluminum, for instance.
> >
>
> Does not the width of the tooth (saw) plays a part too? Or the

depth

> of cut of the milling cutter?
>
> For example, if we have a case of a cutter with a specific chipload
> of say, 0.0025" at a particular feed. Now we use a cutter with

double

> the width (or double the depth of the milling cutter) if chipload

is

> express as a linear dimension, there will be no change in chipload
> although my feeble mind tell me that the power requirement (or
> something else) will change. So if we calculate the feed rate based
> on a specific chipload (linear dimension) that feed rate will be
> independent of cutter thickness/depth, which doesn't sound

reasonable?

>
> Keongsan

Hi keongsan,

Is use vallorbe cutters they can cut the diameter in depth, in alu
that is, so a 16 mm cutter can cut 16mm of depth in one stroke. Of
course your machine must have enough power and stiffness for this. I
use this rule to define the rpm. I know a 4 flute cutter of 8mm must
rotate about 600 in stainless steel. If I use a 2 flute cutter the
rpm must go twice as fast, so 1200. In alu you can can go 4 times as
fast so the 2 flute cutter should spin 4800 rpm. So if one double the
diameter of the cutter the rpm must be devided by 2. Double the
flutes same trick. For the feedrate I just go as fast as possible,
more experience than knowledge. In alu you can go really fast, in
stainless steel i'm a bit more carefull.
Good luck

Hugo