Re: [CAD_CAM_EDM_DRO] Re: Locating already drilled holes

> CNC:
>
> At 02:29 PM 10/11/00 -0500, Jon wrote:
>
> >It works, but if you put the drill rod in a Jacob's chuck, it will
> >likely be a little off center, therefore the hole will also not
> >be exactly under the center of rotation of the spindle.
> >
> >A dial test indicator held in a mechanism that clamps around the
> >spindle can read off the inside of the hole. As you rotate the
> >spindle by hand, you can see the change in indicator reading,
> >and adjust the table until the hole is exactly under the
> >spindle's center of rotation.
>
> I have had for a long time what is called a Co-Axial Indicator.
> This mounts in the spindle of a mill and shows deviations from
> center in both X and Y. A little hard to describe but any
> machinist supply (Enco, Rutland, MSC) will have a picture of one.
> With the spindle running at slow speed one moves the X and Y
> handles for minimum dial reading. When the spindle is directly
> over the hole the dial reading is constant. Much quicker to use
> than a test indicator. A marvelous magical mechanical
> measuring meter. :-)
>
> I also use a dowl pin to quickly locate holes, but I'm sure
> it isn't as acurate as the Co-Ax.
>
> Hugh Currin
>
>
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