Re: centering / edge finder camera


"Andrew Bishop" <andrew@xxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:1189882110.902593.42580@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
can anyone rember what issue mew they covered this topic
Im thinking of getting a usb microscope and using that for the camera

also has anyone made the hemingway kit found here if so how was it

http://www.hemingwaykits.com/acatalog/Centering_Microscope.html



Andrew

I built the Hemingway microscope, partly as an excercise in building it. I
find it extremely useful and very accurate, though havig to put it in the
mill then change to the chuck can be a bit fiddly. It's extremely good for
locating marks, but also unbeateble for centering the rotary table. I have
a taper that drops in the centre hole and has an accurately centered mark on
it - focus the microscope and move the table to bring the mark under the
centre of the graticule and its aligned.

Most people seem to manage perfectly well without one, but I like mine and
am pleased I built it.

Incidentally, the graticule is about the only difficult bit. You can use
any old objective from a microscope and the eyepiece is a standard X10 job.
The prism is essentially a front surface mirror. As I remember, the kit
used to be a lot cheaper - its quite pricey now. You do need to get the
thing anodised - I got mine done by a local company for about a tenner but
had to wait a while.


.

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