Re: [CAD_CAM_EDM_DRO] Dumb question on the drilling of holes

You can get 3 flute drill bits that will do almost as good a job as
drill/ream in one pass. There was a thread about this on alt.machines.cnc
recently.

At 03:24 PM 10/22/02 -0700, you 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.
>
>Marv Frankel
>Los Angeles
>
>
>----- Original Message -----
>From: "Tim Goldstein" <timg@...>
>To: <CAD_CAM_EDM_DRO@yahoogroups.com>
>Sent: Tuesday, October 22, 2002 2:36 PM
>Subject: Re: [CAD_CAM_EDM_DRO] Dumb question on the drilling of holes
>
>
> > Drill bits are well know for making off size and irregular holes. That is
> > why you should use a reamer if the fit is important.
> >
> > Of course this is easier with CNC when you can get back to the same spot
>so
> > you don't have to keep switching tools.
> >
> > Tim
> > [Denver CO]
> > ----- Original Message -----
> >
> >
> > > Guys,
> > > I'm following this subject with great interest. One of the
>reasons
> > I
> > > subscribe to this group, is to learn enough to convert my mill to CNC. I
> > > have been fabricating some parts on a mill, using the DRO, and have run
> > into
> > > problems drilling holes. Using certain drill bits, many of the holes
>have
> > > come out oversize, and some completely out-of-round. Changing bits has
> > > helped, especially if I use a shorter length bit, but I'm going to
> > > investigate using the 135 degree, or other similar drills. I'm looking
> > > forward to a CNC conversion, when I intend to center drill the holes
> > before
> > > using the correct drill bit.
> > >
> > > Marv Frankel
> > > Los Angeles
> >
> >
> >
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> > List Mom
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>Addresses:
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>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects
>goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to
>reach it if 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........
>bill
>List Mom
>List Owner
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/