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  1. Been looking at electronic edge finders that light up when they touch the edge of the workpiece, but don't see how they work. Is it that touching the workpiece completes a circuit through the mill - this seems a tad tenuous, or does the contact close a switch in the finder.. in which case how sensitive is that if these are good to .02mm or better! Thoughts?

  2. #2
    Well have you seen the edge finder a guy posted on the zone ? i also read about a guy who took the mouse from an old laptop and turned it into a edge finder.

    Is that the kind of thing you mean or ?
    .Me

  3. #3

  4. Quote Originally Posted by Lee Roberts View Post
    Well have you seen the edge finder a guy posted on the zone ? i also read about a guy who took the mouse from an old laptop and turned it into a edge finder.

    Is that the kind of thing you mean or ?
    I mean this sort of thing:
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  5. The tip is insulated and when it touches the workpiece, the circuit is completed and the LED lights.
    Too bad if you're machining plastic.
    Regards
    Geoff
    My home

  6. Quote Originally Posted by tumutbound View Post
    The tip is insulated and when it touches the workpiece, the circuit is completed and the LED lights.
    Too bad if you're machining plastic.
    that means the circuit is tip, workpiece, table, column, head, chuck... surely not... a tad tenuous at best...

  7. #7
    Quote Originally Posted by irving2008 View Post
    that means the circuit is tip, workpiece, table, column, head, chuck... surely not... a tad tenuous at best...
    Only as tenious as power station, sub station, machine tool and neutral,
    is 36,000 miles a second or whatever good enough ?
    John S -

  8. Quote Originally Posted by John S View Post
    Only as tenious as power station, sub station, machine tool and neutral,
    is 36,000 miles a second or whatever good enough ?
    not speed John, connectivity... surely relying on all those having a good or any electrical connection to each other is tenuous?

  9. #9
    Especially if the spindle has ceramic bearings no ?
    .Me

  10. that means the circuit is tip, workpiece, table, column, head, chuck... surely not... a tad tenuous at best...
    Yep, that how those ones work (I have a Sony probe for my magnescale DRO that works exactly the same)

    You can get touch probes that are effectively sensitive normally-closed switches (usually three switches in series at 120' to each other) relying on movement of the probe to open the switches and the closed position of the switch as a position reference.

    Nice home-brew design here:
    http://tmonnot.free.fr/Fraisage/Palpeur3D.htm

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