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Posted by Richard Edwards on April 3, 2008, 10:24 am
Please log in for more thread options 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.
--
Richard
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> 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
>
>