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Posted by bugbear on July 2, 2008, 5:21 am
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Given that a surface gauge (and indeed height gauges)
need to sit securely on a surface plate,
why don't they have a tripod support
(which sits secure regardless),
instead of having a flat base, which
is only stable if it's carefully made truly flat?
Surely a 3-point base gives equivalent functionality
in perpetuity at a lower build difficulty.
BugBear (slightly confused)
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Posted by David Littlewood on July 2, 2008, 6:12 am
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>Given that a surface gauge (and indeed height gauges)
>need to sit securely on a surface plate,
>why don't they have a tripod support
>(which sits secure regardless),
>instead of having a flat base, which
>is only stable if it's carefully made truly flat?
>
>Surely a 3-point base gives equivalent functionality
>in perpetuity at a lower build difficulty.
>
Interesting question. Acting as counsel for the defence, as it were, I
suggest the following:
(1) A 3-point surface is more likely to damage a cast iron surface plate
than a flat base, if set down rather heavily, and raise slight bumps
which would be most detrimental. If slid about (as one has to do to
score reference lines) it would be more likely to cause scratches.
(2) A 3-point base is stable only if there is room for all 3 points to
rest on the reference surface. If you were short of space, a flat base
can hang over the edge; a 3-pointer can't.
(3) Making flat surfaces to within a tenth or two by surface grinding is
relatively easy and cheap.
David
--
David Littlewood
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Posted by AC on July 2, 2008, 6:49 am
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> Given that a surface gauge (and indeed height gauges)
> need to sit securely on a surface plate,
> why don't they have a tripod support
> (which sits secure regardless),
> instead of having a flat base, which
> is only stable if it's carefully made truly flat?
>
> Surely a 3-point base gives equivalent functionality
> in perpetuity at a lower build difficulty.
>
> BugBear (slightly confused)
Wouldn't the points be likely to be damaged or quickly lose accuracy due to
wear?
AC
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Posted by bugbear on July 2, 2008, 7:48 am
Please log in for more thread options AC wrote:
>> Given that a surface gauge (and indeed height gauges)
>> need to sit securely on a surface plate,
>> why don't they have a tripod support
>> (which sits secure regardless),
>> instead of having a flat base, which
>> is only stable if it's carefully made truly flat?
>>
>> Surely a 3-point base gives equivalent functionality
>> in perpetuity at a lower build difficulty.
>>
>> BugBear (slightly confused)
>
> Wouldn't the points be likely to be damaged or quickly lose accuracy due to
> wear?
no - the whole point it they don't matter.
Hmm. That applies to a surface gauge, but not a height gauge.
BugBear
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Posted by mark on July 2, 2008, 8:24 am
Please log in for more thread options >
>
> > Given that a surface gauge (and indeed height gauges)
> > need to sit securely on a surface plate,
> > why don't they have a tripod support
> > (which sits secure regardless),
> > instead of having a flat base, which
> > is only stable if it's carefully made truly flat?
>
> > Surely a 3-point base gives equivalent functionality
> > in perpetuity at a lower build difficulty.
>
> > =A0 =A0BugBear (slightly confused)
>
> Wouldn't the points be likely to be damaged or quickly lose accuracy due t=
o
> wear?
>
> AC
if the three points were hardened ball bearings they wouldn't ...
the iron surface plate is many peaks and valleys from scrapping and
meant to add up to flat when something flat is placed on it
granite surface plates ...do they have peaks and valleys ? ...i don't
know, as i don't have one ....if not a 3 ball bearings would work.
all the best.markj
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>need to sit securely on a surface plate,
>why don't they have a tripod support
>(which sits secure regardless),
>instead of having a flat base, which
>is only stable if it's carefully made truly flat?
>
>Surely a 3-point base gives equivalent functionality
>in perpetuity at a lower build difficulty.
>