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Thread: DRO Hunt

  1. #1
    Join Date
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    Default DRO Hunt

    I am trying to find a DRO that is longer than 1 metre preferably about 1.2 though I can cut it down if a longer one can be found. The ebay style of encoder rail is what I am looking for with a single readout as this suits the project I am using it for and the longest one of those I have seen is one metre and I can customise the lead length with a soldering iron and a pair of side cutters. Has anyone got better searching skills than me or know if it is possible to buy the encoder rail in longer lengths as that would be the ideal way to do it, I could then use the reading head and encoder reader from a shorter rail.
    CHRIS

  2. #2
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    I can find them on ebay but bloody hell they’re expensive:

    https://www.ebay.com.au/itm/2-3-4-5-...154756-20017-0

  3. #3
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    Default

    CHRIS

  4. #4
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    It looks like the capacitive style tops out at 1m, even checked Mitutoyo and there's nothing longer. After that you're into glass scale territory.
    Gear cutting specialists and general engineers www.hardmanbros.com.au
    Fine pitch gear cutting from 0.1 Module www.rigear.com.au

  5. #5
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    Default

    Yep, that's what I thought but I was hoping someone could find a longer one. I don't want a hugely long lead in fact it most probably does not need to be more than a 100mm long as both the read head and encoder head will both move together.
    CHRIS

  6. #6
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    The only thing longer I could see was digital calipers, but those are hella expensive
    Gear cutting specialists and general engineers www.hardmanbros.com.au
    Fine pitch gear cutting from 0.1 Module www.rigear.com.au

  7. #7
    Join Date
    Feb 2012
    Location
    Tamworth, NSW
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    Default

    A quick google turned up these - is this the kind of thing you’re after?

    Shahe does a 1000mm scale Digtal Linear Scale with Remote Square Display (5403-150F/200F/300F/500F/600F/1000F? | Wenzhou Sanhe Measuring Instrument Co.,Ltd

    https://images.app.goo.gl/VMfLzzXgq15aAzVi9

    or 1200mm

    https://www.mrclab.com/horizontal-di...le-unit-1200mm

    Another cheap 1000mm

    https://m.indiamart.com/proddetail/d...868580391.html

    different style - 1200mm search sino KA600 on Ali express.

  8. #8
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    Helensburgh
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    Default

    Thanks, that is the only 1200mm one I have been able to look at. I wonder if it would get here in one piece, I might give them a call and ask a few questions.
    CHRIS

  9. #9
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    Feb 2012
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    Tamworth, NSW
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    Default

    Quote Originally Posted by Chris Parks View Post
    Thanks, that is the only 1200mm one I have been able to look at. I wonder if it would get here in one piece, I might give them a call and ask a few questions.
    Well if you want a challenge you could try a 1500mm from here https://prairiebearingshop.com/sylva...m-30-814-1515/


    At least this one is in a box….

    https://www.machine-dro.co.uk/horizo...1500mm-60-inch

  10. #10
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    Hi Chris, Guys,

    Those scales can be cut and re-joined ! You just have to be very precise with the joint. The pattern on the scale has to follow the previous one exactly or you will get a reading that jumps or even goes to zero.

    You might even be better off buying a roll of the read tape if you can get it. Its self adhesive backed so you can apply it to a suitable support.
    Best Regards:
    Baron J.

  11. #11
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    Default

    I did wonder about joining it and sort of dismissed the idea because it was obvious that the join would cause problems if not done precisely. It would be easy to join two extrusions together and apply the scale but I would not have a clue on where to buy it and if it has to be specific to the reader.
    CHRIS

  12. #12
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    Hi Chris,

    I made the assumption that you would realize that you had to lift off the protective surface tape to be able to see the etched fingers underneath. The difficult part is getting the sequence correct, if you have a gap or the sequence is out or wrong the display does all sorts of funny things ! But if you get it right the read head doesn't care.
    Best Regards:
    Baron J.

  13. #13
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    I know nothing about this stuff so I need help. I had a look at magnetic scale tape and it is all made for printers or the stuff I found was.
    CHRIS

  14. #14
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    Hi Chris, Guys,

    Its a while since I had anything to do with this stuff, so I don't have any pictures !
    In my case it was a salvage job repairing a badly damaged scale by removing the damaged section and replacing it with a good one.

    Basically the scale is three or four layers of material, a back adhesive layer, like double sided tape. On top of that is a plastic film printed with what looks like gold fingers of different lengths. Then there is a protective film layer.

    Basically the reader counts the number of pulses from the passage of the fingers under it. Its exactly the same principle as used in a digital calliper !

    In fact I believe that someone makes a DRO that uses the scale material to make a lathe crosslide DRO and the reader is secured either above or below the self adhesive scale.

    Its quite likely that the magnetic scale tape that you found is the same stuff that I've seen.

    [URL="https://www.machine-dro.co.uk/high-accuracy-magnetic-linear-tape"]https://www.machine-dro.co.uk/high-accuracy-magnetic-linear-tape

    EDITED: To mention that the type of scale I repaired was a capacitive type and not a magnetic one "
    Best Regards:
    Baron J.

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