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

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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