2 vs 4 flute cutters ( was Re: Dumb question on the drilling of holes

Hi,

If I remember correctly, 2 flute are typically on or oversize and 4
flute are always undersize.

Dave

--- In CAD_CAM_EDM_DRO@y..., "Howard Bailey" <bogmstr@i...> wrote:
> Marv,
>
> I had a similar problem over the weekend. The remedy was to significantly
> decrease feed and increase RPM when plunging. This gave more time and force
> to throw the chips away from the cut. This was with a 4 flute center
> cutting end mill. Obviously a 2 flute would have worked better for plunging
> offering more room for chip evacuation, but I didn't.t have one at hand.
> Also, a bit of cutting fluid at the plunge location helps to keep the chips
> from sticking and can delay the packing problem.
>
> Regards,
>
> Howard Bailey
>
> ----- Original Message -----
> From: "Marv Frankel" <dcdziner@p...>
> To: <CAD_CAM_EDM_DRO@y...>
> Sent: Tuesday, October 22, 2002 11:15 PM
> Subject: Re: [CAD_CAM_EDM_DRO] Dumb question on the drilling of holes
>
>
> > Jon,
> > Thanks for your input. My spindle is tight, so are the bearings, and
> > the 1/4" end mill is held in a pretty new collet. When I tried plunging
> the
> > end mill through an 1/8" wall aluminum extrusion, I could feel resistance
> on
> > the quill. Then I realized that, as the cut started, the chips built up
> > between the end flutes, and caused some galling and hole distortion, since
> > the chips, unlike a fluted drill which gets rid of it's own chips, had no
> > place to go. I'll try to do some testing, and document my findings, to
> > arrive at the best solution.
> >
> > Marv Frankel
> > Los Angeles
> >
> > ----- Original Message -----
> > From: "Jon Elson" <elson@p...>
> > To: <CAD_CAM_EDM_DRO@y...>
> > Sent: Tuesday, October 22, 2002 10:25 PM
> > Subject: Re: [CAD_CAM_EDM_DRO] Dumb question on the drilling of holes
> >
> >
> > >
> > >
> > > Marv Frankel wrote:
> > >
> > > >Tim,
> > > > I'm pretty familiar with reaming holes for proper fit, but the
> > holes
> > > >I'm talking about, are sometimes so misshapen, they almost look
> > triangular.
> > > >They're 1/4" holes, and I've even tried cutting them through with an
> end
> > > >mill, and that wasn't great either.
> > > >
> > > >
> > > A properly sharpened drill bit will not do this except on very thin
> > > sheet. A dull drill bit can
> > > sure do things like this. End mills generally make VERY round and
> > > smooth holes, even when
> > > plunged. If you are trying to plunge an HSS end mill into tool steel,
> > > however, that could cause
> > > deflection. Are you sure your spindle is solid? A bad spindle bearing
> > > or loose quill could
> > > do this. I hope you aren't holding a 1/4" end mill in a Jacob's chuck.
> > > That really won't work,
> > > and isn't safe, either!
> > >
> > > Jon
> > >
> > >
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> you have trouble.
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
> sister site to the CCED group, as many of the same members are there, for OT
> subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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> > List Mom
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