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4 or 5 axis DRO with rotary encoder angular display

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  • jcge
    replied
    OK got it now - thanks for the explanation.

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  • Bented
    replied
    Originally posted by jcge View Post
    Bented - by C Axis I'm understanding that you mean lathe spindle angular position (not displayed to the user). Please correct me if I've misunderstood.
    Appreciate your input
    Thank you
    John
    You are correct, the C axis encoder enables the Z axis to begin moving at the correct rotational position, this is independent of spindle speed as long as the lead does not exceed the max feed rate.
    For the last several I have been running a new lathe with a "Thread Repair" feature, you enter the thread repair screen then rotate the spindle by hand a few times in the desired direction, manually jog the threading tool into a thread by eye and enter a Z value. As you may imagine this slow and tedious, it is far easier to pick up an existing thread on a manual lathe with a compound slide.

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  • jcge
    replied
    RB211 and genea - thanks for the feedback on the Ditron displays - I'll have a look for the D80 V2 manual

    elf - I hadn't considered using separate displays..I'll consider that too.

    Appreciate all of the input. Thank you.
    John

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  • elf
    replied
    You could just use two DRO displays, one 3 axis and one 2 axis.

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  • RB211
    replied
    And there’s now some really nice Ditron heads for sale with LCD’s for around $200

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  • genea
    replied
    On the D80 any of the 5 axes can be set to either linear or rotary mode. As far as I can tell, rotary mode is displayed as degrees, with 4 places to the right of the decimal point. If there are other options I can't find them. In linear mode, MM: there are always 3 places to the right of the decimal. In linear mode, INCH: there are either 4 or 5 places depending on the resolution setting you've selected. The display resolution setting you choose is universal. You can't select resolution on a per axis basis.

    The display offers a non-linear compensation mode but there's no way to enter a compensation factor, so you're stuck with only the scale resolutions Ditron offers.

    As an option, available at time of purchase, one axis may be used for RPM readout

    BTW there's a V2.0 of the D80 manual available.
    Last edited by genea; 11-10-2021, 04:36 PM. Reason: Spelling

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  • RB211
    replied
    Originally posted by jcge View Post
    Heres a couple of lower cost DRO manuals I've looked at - any Ditron owners care to comment ?

    Ditron D80 (LCD type)
    https://www.machinetoolproducts.com/...02017.6.28.pdf

    Ditron D70-4V (7 segment type)
    https://zsinstruments.com/downloads/...anual-V2.0.pdf
    I seem to recall that my Ditron D60 supports a rotary encoder for an axis. I am not home though to verify.

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  • jcge
    replied
    Bented - by C Axis I'm understanding that you mean lathe spindle angular position (not displayed to the user). Please correct me if I've misunderstood.
    Appreciate your input
    Thank you
    John

    Leave a comment:


  • Bented
    replied
    All CNC lathes that will thread have a C Axis encoder which only tells the Z axis where to begin the thread, this places the tool in the correct position during the multiple passes often required.

    Most do not display the spindle position as an angle value.

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  • jcge
    replied
    And manual for a ToAuto DRO 2V/3V shows some indication of this capability, but does not really elaborate beyond the configuration.

    https://trabiss.nl/wp-content/upload...structions.pdf

    "When selecting the rotary encode, the resolution will be set as follow: Input the rotary encode parameter value ."

    "3.2.14 Setting the Angle Display Mode Press until“ANG DISP” appears in message window. Press to change the angle display mode for X axis;Press to change the angle display mode for Y axis;Press to change the angle display mode for Z axis; Example for X axis: “0.0000” means the angle mode is Circulating DD; “0000.0000” means the angle mode is Incremental DD; “0.00.00” means the angle mode is Circulating DMS; “0000.00.00”means the angle mode is Incremental DMS;"

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  • jcge
    replied
    Heres a couple of lower cost DRO manuals I've looked at - any Ditron owners care to comment ?

    Ditron D80 (LCD type)
    https://www.machinetoolproducts.com/...02017.6.28.pdf

    Ditron D70-4V (7 segment type)
    https://zsinstruments.com/downloads/...anual-V2.0.pdf

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  • jcge
    replied
    Thanks Bented - I looked up the manual for the Newall DP1200 that you linked to above and it provides a pretty clear account of how it works on that model (incl configuration options)
    Still at the pointy end of the price curve but does help with understanding the functionality that I'm after.
    Thank you

    http://www.newall.com/upload/product...%20-%20usa.pdf
    Last edited by jcge; 11-09-2021, 08:00 PM. Reason: added link to Newell DP1200 manual

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  • Bented
    replied
    Every CNC lathe and mill that I have ran employ rotary encoders on the axis drives.

    I suspect your first hurdle will be sourcing a single interface with a 4 axis display for hobby money.
    XYZ and W axis in degrees.

    This is the display only.
    https://www.machinetoolproducts.com/...gital-readout/
    Last edited by Bented; 11-09-2021, 07:24 PM.

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  • jcge
    replied
    Thanks Doozer...not sure that's in my price range...but I do accept that may reflect whats required to meet the requirement.
    John

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  • Doozer
    replied
    Only Heidenhain comes to mind that supports a rotary axis readout.

    -Doozer

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