Re: [ATM] which spherometer dial indicator tip

["Don Clement" <don_clement@charter.net>]

Hi Dominic,



Not sure about metric dial indicators but AGD type gauges have a female 4-48
thread at the end of the spindle.  There are a wide variety of tips that can
be threaded into the 4-48 thread. see:
http://www.dialindicator.com/accessory_contact_points.php Also there appears
to be metric to inch converters for the tips. I would go with a spherical
sapphire tip.



Don Clement

Running Springs, California





>
> Hi everyone,
>
> I am hoping someone might have some suggestion about which tip
> to get for the shaft of a dial indicator to be used on a
> spherometer. I have the Compac SH 524 (metric 0.002 mm resolution).
> The shaft is a hollow metal dowel. I inquired about some more
> common tips and was warned not to buy/use these on optical surfaces
> because they are made of carbide, etc and are known to cause
> scratches on glass. It was explained that there are nylon tips
> for fragile surfaces, but then I was confronted with a lot of
> possible shapes. At the same time, I am pretty sure I once read
> about some EU and ANSI standards. Any suggestions or warnings what
> to avoid?
>
> Has anyone made one? I thought of a using a 1.5 mm drill bit,
> but that fit too loosely, and of course, the next size up won't
> fit at all.
>
> Dominic
>
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>

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