RE: Lighted edge finder

Ian,

Kinda what I was thinking, I mentioned the "bomb sight" used on
plotters, that and your binocular prism. I looked at my bomb sight last
night; it has a circle and a dot in the center. I had to be right on
top of it to see anything. Will explore more.

I couldn't find my MSC catalog, and I couldn't find "optical edge
finders" in the other catalog's I have (limited selection).

About the ear-muffs, I use a pair of headphones, and listen to CD's or
the TV when it gets noisy!

Alan

Ian Wright wrote:

>
> Hi,
>
> All this talk of meachanical methods of edge finding makes me wonder whether
> anyone is aware of optical centre/edge finders. These are easily available
> and are by no means impossible to make - half an old pair of wartime
> binoculars will provide all the necessary optical bits - a right angled
> prism, lenses for an eyepiece and, usually, a cross-hairs or other similar
> scale. Then its just a matter of a bit of fairly careful machining to make a
> holder which will slip in place of the tool and position the eyepiece cross
> hairs image directly over where the tool centre would be.
> Assuming you can then hit a 'home' button or something, the machine would be
> set up without all the hassle of adding or subtracting half diameters
> orwondering why the motor has gone quiet after a sonalert has echoed around
> your ear-muffs! ;o)
>
> Ian
> --
> Ian W. Wright
> Sheffield UK