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  1. #101
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    Quote Originally Posted by GeorgiMirov View Post
    Hello Alex ,

    I did almost the same.
    I removed the sensor from the motherboard and remeasured a tool. I saw almost 1mm deviation.
    At that point I realized what's going on. I measured the resistance of the thermal sensor and I added 20 M ohm resistor at it's place ( this gives a value of the I/O P45.1 of about 620 ( whatever this is ) which corresponds to about 24 deg.
    I am running the machine with this hack since Friday , and it seems to hold about 0,01mm when properly warmed up.
    My local HFO said that this week HAAS should came up with the new software to fix it but we will see how good it is.

    Regarding the nod of the head in Y. On my machine I see about 0,03mm sag through the stroke of the Y axis.
    Mostly after passing the center.
    I don't know why HAAS put the tool probe in the worst possible place , as if you mainly work in the center of Y axis your tools will be shorter.

    So far the rotaries are still surprisingly good. I put a micron indicator on B and I jog in 0.001 increments and holy moly there is
    no backlash.

    Another anomaly I see is the C axis. Especially the brake on it. When the brake is engaged I see 0.02mm of pull down of the indicator. On the B there is a movement of the needle when brake is applied but it's in the range of 2-3 microns.

    I am doing the Ball calibration for a 4th time. I am getting +/- 0,01mm in X and Y offset variance.
    Z is surprisingly about 0,05mm out ( no matter what I do ) I need to manually readjust it while machining ( after the calibration If I have to face a block on the opposite sides I get 40,1mm actual size instead of 40.00mm.
    I am using a 2mm ball stylus on the probe , but don't think this is the problem.
    I learned a lot in the past 2 weeks since calibrating and adjusting this machine....

    After 3 days of big material removal - surprise surprise the chip conveyor channels are now clogged and 50% of the coolant is staying inside the machine while running.
    Quote Originally Posted by GeorgiMirov View Post
    So far the rotaries are still surprisingly good. I put a micron indicator on B and I jog in 0.001 increments and holy moly there is
    no backlash.
    ^^^ That's really helpful / useful to know - a lot of Machine Tool Builders don't state practical sensitivity of movement for rotary axes (and associated backlash through a mechanism, compensated or not.). Important for making final finer corrections either referenced to the spindle or to a third (more accurate and precise) reference system.

    The other values and measurements useful too. Interesting about the pull down of the table when braked but I assume dynamically the cycloidal drives have a lot of torque so the brake does not have to be applied a lot of the time. And when you do then you know the additional offset value / repeatability.

    It's easy to forget that these rotary axes on 5 axis machines can have reasonably substantial runout / broader concentricity than something like the concentricity of a spindle on a cnc lathe. + the center bored hole on a table as reference surface is not necessarily going to be concentric to the slightly uncertain axis of rotation of the C axis rotary table. [Quick and dirty finding of centers.].

    Repeatability over accuracy will be super helpful to close in on stuff (in terms of "Process" - blah blah blah );

    HAAS advise to iteratively tweak a separate (intermediate ) working CAD model to converge on what you want as a final part. [In some cases.] or edit the cnc program directly.



    MRZP and DWO

    ^^^ This is what HAAS themselves say about DWO + MZRP and realistic expectations etc.

    HAAS troubleshooting section (as usual) has a lot of good stuff and details about calibrating the touch probe itself.
    Last edited by cameraman; 05-13-2021 at 01:58 PM.

  2. #102
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    Can somebody else also measure the sag of the head in Y on their machine please ?

    I would like to know if those 40 microns are common or my machine is not levelled correct.

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  4. #103
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    Quote Originally Posted by GeorgiMirov View Post
    Can somebody else also measure the sag of the head in Y on their machine please ?

    I would like to know if those 40 microns are common or my machine is not levelled correct.
    Common. A major weakness of this machine.

    I don't know if it's 40 microns, that seems high, but it's definitely far from zero.

    I need to pick up a granite square and check it out.

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