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Posted by Andrew Mawson on April 3, 2008, 12:50 pm
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> On Thu, 03 Apr 2008 15:24:37 +0100, Richard Edwards
>
> >On Thu, 3 Apr 2008 08:56:54 +0100, "Andrew Mawson"
> >
> >>
> >>>
> >>> > Emimec wrote:
> >>> >> I cut many varying lengths, to a bar stop, on a chop saw. I
was
> >>wondering
> >>> >> if a sonic or laser measure with some sort of digital readout
> >>could be
> >>> >> incorporated in the bar stop to give a quick and accurate
> >>distance
> >>> >> measure from the blade. Lengths cut vary from 500mm to
1500mm,
> >>including
> >>> >> half a mm measurements. By that I mean one length could be
> >>1037.5mm, and
> >>> >> needs to be as spot on as it can be, (currently done with a
steel
> >>2 metre
> >>> >> rule and magnifying glass!!!)
> >>> >> Anyone done this or can point me in the right direction, the
> >>purpose of
> >>> >> the idea being speed of set up with accuracy.
> >>> >> Bob
> >>> >
> >>> > Not sure it would work well Bob.
> >>> >
> >>> > The ultrasonic devices I just looked up after reading your
message
> >>quote
> >>> > 1% accuracy and distances >600mm.
> >>> >
> >>> > The laser ones seem to have a 1.5mm accuracy, bit of a large
tol
> >>> > considering I routinely cut to a 0.1mm accuracy repeatable on
my
> >>cutoff
> >>> > saw.
> >>> >
> >>> >
> >>> > Wayne....
> >>>
> >>> Many thanks, another great idea bites the dust then !!!
> >>> Seems I'll need to get a bigger magnifying glass !!!
> >>> Bob
> >>>
> >>>
> >>Bob,
> >>
> >>If you are cutting to a stop on a chop saw then presumably the
blanks
> >>are not too long, could you use a conventional dro scale, with
your
> >>stop fixed to the sliding head? One company (was it Mitutoyo?)
brought
> >>out a magnetic strip that could be cut to length and self stuck to
a
> >>machine bed, with a reader head that passed over it.
Alternatively,
> >>those cheap dro heads from BW Electronics that have a reel of fine
> >>stainless wire that follows the movement of your stop:
> >>
> >>http://www.bwelectronics.co.uk/
> >>
> >>AWEM
> >>
> >The pull out wire unit only has a max read length of 500mm. However
> >how about using this together with a main bar that can only be
locked
> >at 500mm increments. The readout fixed to the bar and linked to the
> >actual stop which slides along the end 500-600mm length of the bar.
> >This would give you what you need at low cost with a fast setup.
>
> mmmmm......not so sure about the low cost bit. A sensor
> and a display unit is best part of £250 if I read it right. On the
other
> hand, I have had two of these units for several years, a set on a
mill and
> a set on a Myford...and have had no problems.
> --
>
> Chris Edwards (in deepest Dorset) "....there *must* be an
easier way!"
The "391" will measure 48" and costs £166, no need for separate
display as it's built in. I fitted a three axis system to my
Bridgeport many years ago as it was all I could afford at the time.
However I was so impressed with the facility of having a dro was
persuaded to buy 'proper' ones (Newall spherosyn) for the lathe and
grinders when later I could afford them. Never seen fit to replace the
ones on the Brigeport as they are quite adequate for my usage.
AWEM
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