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Thread: Little red dot

  1. #1
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    Default Little red dot

    My brother in law was a design engineer for Metal Box before he retired. Now he is retired, he takes it easy, as one does, by rebuilding old Rudge motor bikes, driving his Kawasaki around at great speed and racing his go cart. He is only 85 after all.

    He made me an arm to take a Kelton hollower a while ago and its built like the proverbial brick outhouse. It has gokart stub axles as pivots and it is rock solid in use. The only problem is the old one of knowing EXACTLY where the tip is and I casually mentioned this to him when he and his sister came out from the UK for a long weekend recently.

    So what should arrive this morning!!!
    100_4120.jpg



    Do those of you that have such a device find it easier to just line the laser up with the tip or set it so that it is the required thickness away. I tend to think the latter but until I try it I won't know which is easier.

    I must think of a few more casual mentions
    Gordon
    Steadman Instrument Repairs - just call me SIR
    http://englishcarpenter.blogspot.fr/
    http://www.englishcarpenter.com

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  3. #2
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    Default

    Do those of you that have such a device find it easier to just line the laser up with the tip or set it so that it is the required thickness away. I tend to think the latter but until I try it I won't know which is easier.
    I use my laser to [a] keep an eye on where it is when roughing out a hollow vessel and then[b] to turn to a predetermined wall thickness when finishing.
    Inspiration exists, but it has to find you working. — Pablo Picasso


  4. #3
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    Question

    Wot's a laser?

  5. #4
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    I haven't got a Laser,: will a Cortina do instead?
    Some days I turns thisaway, somedays I turns thataway and other days I don't give a stuff so I don't turn at all.

  6. #5
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    Quote Originally Posted by Tim the Timber Turner View Post
    I haven't got a Laser,: will a Cortina do instead?

    Should be fine provided it's in neutral else it might run away from you.


    Peter.

  7. #6
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    I use mine as Hughie describd
    Ted

  8. #7
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    Default Oh for heaven's sake

    I don't know, I ask a serious question and you lot turn it into a fun fest. Must be the sun down there.

    So for Artme.
    A laser is a device that emits light (electromagnetic radiation) through a process of optical amplification based on the stimulated emission of photons. The term "laser" originated as an acronym for Light Amplification by Stimulated Emission of Radiation.[1][2] The emitted laser light is notable for its high degree of spatial and temporal coherence.
    Spatial coherence typically is expressed through the output being a narrow beam which is diffraction-limited, often a so-called "pencil beam." Laser beams can be focused to very tiny spots, achieving a very high irradiance, or they can be launched into beams of very low divergence in order to concentrate their power at a large distance.
    Temporal (or longitudinal) coherence implies a polarized wave at a single frequency whose phase is correlated over a relatively large distance (the coherence length) along the beam.[3] A beam produced by a thermal or other incoherent light source has an instantaneous amplitude and phase which vary randomly with respect to time and position, and thus a very short coherence length.
    Most so-called "single wavelength" lasers actually produce radiation in several modes having slightly different frequencies (wavelengths), often not in a single polarization. And although temporal coherence implies monochromaticity, there are even lasers that emit a broad spectrum of light, or emit different wavelengths of light simultaneously. There are some lasers which are not single spatial mode and consequently their light beams diverge more than required by the diffraction limit. However all such devices are classified as "lasers" based on their method of producing that light: stimulated emission. Lasers are employed in applications where light of the required spatial or temporal coherence could not be produced using simpler technologies. Which is why its so relevant to the turning community.

    As for the rest of you, the joke would be somewhat wasted on most up here as the Laser name was never used up here and Cortina is a nice place in Italy where they all drive Fiats - or at least they did when I was there in the 70's.

    As for the two semi helpful replies, it looks as if I will just have to experiment and discover the best way to place the little red dot all by myself, I sort of guessed it might be useful for knowing where the tip was!!
    Gordon
    Steadman Instrument Repairs - just call me SIR
    http://englishcarpenter.blogspot.fr/
    http://www.englishcarpenter.com

  9. #8
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    Default

    As for the rest of you, the joke would be somewhat wasted on most up here as the Laser name was never used up here and Cortina is a nice place in Italy where they all drive Fiats - or at least they did when I was there in the 70's.

    As for the two semi helpful replies, it looks as if I will just have to experiment and discover the best way to place the little red dot all by myself, I sort of guessed it might be useful for knowing where the tip was!!
    Hey Gus here's a tip for, you lighten up a bit.

    This is an Australian site where we make international visitors welcome.

    There is a heap of top information avaliable here.

    However this site is well known for it's humor and sarcasm.

    Read between the humor and sarcasm and take from it what you need.

    Good luck and cheers

    Tim
    Some days I turns thisaway, somedays I turns thataway and other days I don't give a stuff so I don't turn at all.

  10. #9
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    Quote Originally Posted by Tim the Timber Turner View Post
    Hey Gus here's a tip for, you lighten up a bit.

    This is an Australian site where we make international visitors welcome.

    There is a heap of top information avaliable here.

    However this site is well known for it's humor and sarcasm.

    Read between the humor and sarcasm and take from it what you need.

    Good luck and cheers

    Tim
    Hi Tim,

    I'm light as air. I thought my reply was as tongue in cheek as most of the replies but there you go. Humour and sarcasm (especially sarcasm) are as natural to me as eating and breathing so I should feel right at home.

    The only time I can remember taking offense was at another forum in the UK who treated a fellow member very badly. I haven't been back since but I don't suppose they noticed.

    My only reservation about the answers was that no-one actually answered the question about using my new toy!! I'll manage.
    Gordon
    Steadman Instrument Repairs - just call me SIR
    http://englishcarpenter.blogspot.fr/
    http://www.englishcarpenter.com

  11. #10
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    Thanks for the info Gus but I actually knew what a laser was. Just my way of saying I don,t have one

    For that reason I really can't offer any help.

    Have fun with your new toy and show off the results for all to see.

  12. #11
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    Default

    I do not have a laser for wood turning a hollow form and as yet I have not even come close to making a hollow form. So what I will reply might be a little way off and will stand corrected happily.

    When you set the laser it is done at the distance of the actual thickness you want the walls to be not at the tip. With what I observed at the Sydney working with wood show this can be set at anytime when you start turning and once you no longer see the red dot on the turning you should be at that thickness for that part of the turning.

    The question does come to mind will I go down that path to create a hollow form? I have not quite decided as I am still very new to turning.

    Do update when you actually try it.

  13. #12
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    A little red dot tells me it's sold and I amd getting most of the money....
    Jim
    Sometimes in the daily challenges that life gives us, we miss what is really important...

  14. #13
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    Quote Originally Posted by artme View Post
    Thanks for the info Gus but I actually knew what a laser was. Just my way of saying I don,t have one

    For that reason I really can't offer any help.

    Have fun with your new toy and show off the results for all to see.
    Ta muchly. Fun is what its all about. I was reading a bit on the WOW site in the USA today and it was getting all very serious about the Artist making no compromises with his art and its better to starve in your garret than just do stuff to pay the mortgage. Might be interesting to start a thread (if it hasn't been done to death here) and see what the take on the subject is down here
    Gordon
    Steadman Instrument Repairs - just call me SIR
    http://englishcarpenter.blogspot.fr/
    http://www.englishcarpenter.com

  15. #14
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    Quote Originally Posted by Christos View Post
    I do not have a laser for wood turning a hollow form and as yet I have not even come close to making a hollow form. So what I will reply might be a little way off and will stand corrected happily.

    When you set the laser it is done at the distance of the actual thickness you want the walls to be not at the tip as. With what I observed at the Sydney working with wood show this can be set at anytime when you start turning and once you no longer see the red dot on the turning you should be at that thickness for that part of the turning.

    The question does come to mind will I go down that path to create a hollow form? I have not quite decided as I am still very new to turning.
    Aha, thats logical and is what I suspected. Its nice to know that is how its done though. Thanks. I've been using the fingers to judge the rough thickness and then calipers but it gets a bit difficult when you can't reach the bottom of the turning.

    Have a go, its challenging to get a nice even thickness all the way down the walls.
    Gordon
    Steadman Instrument Repairs - just call me SIR
    http://englishcarpenter.blogspot.fr/
    http://www.englishcarpenter.com

  16. #15
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    Quote Originally Posted by powderpost View Post
    a little red dot tells me it's sold and i amd getting most of the money.... :d
    jim
    Gordon
    Steadman Instrument Repairs - just call me SIR
    http://englishcarpenter.blogspot.fr/
    http://www.englishcarpenter.com

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