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  1. #325
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Looks like you understand it more than a little murray
    A 2016 Hurco is the only machine i have ran that allows a feedhold during tap cycle its nice as it keeps the kosher way of controlling a machine. Its more common in a questionable/new operation to feedhold so during a tap cyccle the feedhold would be more of a natural reflex. Been several times during a tapcycle on other machines that i tried to feedhold. But iam up for what is the safest,sure way to handle this for everyone. Which is most likely just blocking the factory feedhold buttons during tapcycle as murray has said.

    http://www.homecncstuff.elementfx.com/


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    Gold Member TomKerekes's Avatar
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hi Troy/mmurry70,

    Here is a patch that changes the Interpreter to expose if it is currently in a tap cycle.

    KMotionCNC is changed where if FeedHold is pushed while in a tap cycle instead of feedholding it will flag the M119 Tap program (by setting persist Var+0 to -1). It should also show the Feedhold DualButtonState image correctly based on the persist Var state.

    It will then be up to the Tap Program to detect the Var set to -1 and stop the spindle. The Resume Button will then Clear the Var to 0 to tell the Tap Program to restart the spindle in the recorded direction.

    To solve the problem where the operator pushes Feedhold just exactly before a Tap Cycle and XYZ begins feedholding and then the TAP cycle begins, the Tap Program must detect any motion Feedhold, release it, and trigger a "Tap" feedhold.

    Does any of this make sense?

    Here is the GCodeInterpreter that exports Tap Cycle State:
    http://dynomotion.com/Software/Patch...nterpreter.dll

    Here is the KMotionCNC that handles Tap Feedhold:
    http://dynomotion.com/Software/Patch...KMotionCNC.exe

    Here is a modified Tap c Program that includes monitoring for Tap Feedhold:
    http://dynomotion.com/Software/Patch...ld%20Rev%204.c

    Could you test to see how much of it works?

    Regards

    TK
    http://dynomotion.com


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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Tom,
    Tested your files. As soon as Tapcycle is started the spindle shuts off but stays synced. Then if i manual switch on spindle tapcycle finishes for 1st hole and spindle shuts off again after 2nd hole is started.
    Feedhold works correctly for the X axis feedmove and is ignored during tapcycle.
    Other than spindle turning off all appears to be working.

    http://www.homecncstuff.elementfx.com/


  4. #328
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hi Troy,

    Opps Var+0 was already being set to -1 causing an immediate Tap Feedhold. Lets use -2 to command a Tap Feedhold.

    The patch KMotionCNC.exe and Tap C Program have been updated to use -2.

    Please try it again.

    Thanks

    TK
    http://dynomotion.com


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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hi Tom,
    That fixed the spindle shut off issue. Going to try a few more test scenarios air and then try a test in plastic. Plastic should show any sync issues with breaking tool.
    Thanks again,
    Troy

    http://www.homecncstuff.elementfx.com/


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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Nice work Tom, that looks great. I might try the new code on my machine someday too.

    Troy, if you want to check how well its synced try tapping a piece of flatbar extended out over the edge of a vise and put an indicator on it. The part will be able to deflect a little and the indicator will show how well spindle is following the tap. My machine was less then 0.005" and i had some slop in Z axis at the time. I was pretty happy with that. Trying plastic or something soft isnt a bad idea first.



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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Ok. Tried tapping 1/4-20 in plastic, alluminum and then C.R.S. all tapped well. And the steel thread had a very good fit. Only had a used hand tap. Will need a new power tap to do an accurate deflection test. But i think its good just by the how the steel tapped.
    Thanks again,
    Troy

    http://www.homecncstuff.elementfx.com/


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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Good to hear its working well, your probably fine if taps are not breaking and threads are a good fit.

    I peck tapped some 10-32 holes in stainless today and it worked well. One minor issue is it starts pecking immediately from the R plane. I was pecking only 1 turn at a time today so there were several pecks before it cut anything. Ill try and fix this someday when i get a chance, shouldnt be too hard.



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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Actually forget about what i said above. The top of work piece isnt even defined in G84, only the R plane and depth so it has to work the way it is now.



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    Default Linear Magnetic Scales (Hurco Mill)

    Looking for scales for my mill now. Looking at the magnetic scales. Renishaw scales and reader heads are a bit pricey. Dont want to got that route unless i have to. Has anyone used or heard of these scales ? https://www.machine-dro.co.uk/indust...-encoders.html
    They have some on ebay sold in the states.
    Attached is data sheet of the 5uM. I have emailed them about getting a 1uM or 2 uM.

    Tom or anyone see any issues with using these scales with my Kflop/Kanalog/Konnect combo? Obviously want to use them to close the loop at table and head of mill. My max Rapids are 800IPM.
    Also is the encoder reading speed of Kflop 1Mhz total for 8 axis or 1 Mhz per encoder?

    Thanks,
    Troy

    Attached Thumbnails Attached Thumbnails Hurco BMC20 Dynomotion Retrofit-dro-eh-05-encoder_techincal-pdf  
    http://www.homecncstuff.elementfx.com/


  11. #335
    Gold Member Jim Dawson's Avatar
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    I have Renishaw LM-10 1um on my mill & router, but I put Ditron MR200 1um on my lathe. Same form factor and specs as Renishaw. I have tested them side by side and found them to be functionally equivalent. About $120/axis including the mag tape and shipping.

    Jim Dawson
    Sandy, Oregon, USA


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    Default Re: Hurco BMC20 Dynomotion Retrofit

    I built a small digitiser/probing machine, using a 3040 as a base, a KFlop + KStep for control/drive, and closed the loop using 1uM scales from Machine-DRO.

    They are pretty generic Chinese scales, so if you're across the pond, I'd look at buying direct from china. The same scales can be found on aliexpress. Although Machin-DRO at the time happened to not cost much more than buying direct from China, and had what I wanted ready to ship.

    To get 1uM, they need different reader heads, and if you're wanting to use them with the Kanalog, I'd be asking to get the differential output option as well.
    The 1uM option isn't actually any more accurate than 5uM, as they use the same optical scales, however they're still more accurate than magnetic tape systems. (I just rechecked that, and the Renishaw tape system only has positional accuracy of +/-20 to 40uM, and even the standard M-DRO optical scale only varies from +/-5 to 10 uM depending on length).



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