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  1. #161
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    What you REALLY need is a billet windshield! CNC machined from transparent aluminum (aka sapphire...) billet...

  2. #162
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    Try to order a 4R100 forward drum machined from a bar of 4140 steel. I will bet nobody makes one.

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  4. #163
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    Quote Originally Posted by bryan_machine View Post
    What you REALLY need is a billet windshield! CNC machined from transparent aluminum (aka sapphire...) billet...
    As easily as Aluminium Oxide can be cracked as a laser core, watch crystal, or grinding wheel?

    B'lieve I'd stick with and inch or so of Lexan!

    Especially if I COULD "bill it"... to someone else..

  5. #164
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    Not related to the *shop*, but it's only 12ft away

    This is what I did with my weekend:


    Attached Thumbnails Attached Thumbnails 20170807_134643s.jpg   20170807_134620s.jpg  

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  7. #165
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    Are you plagued by the smoke there like we are in W. WA? Hopefully not...

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  9. #166
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    Yes, it has been smokey here. Not as bad as 2014, but still hazy, and you can smell it from time to time. You can see the haze in the background of these pictures -- normally there would be no haze at all, it would be perfectly clear.

  10. #167
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    LOL!

    That looks like a clear day in Ohio!


    ----------------

    Think Snow Eh!
    Ox

  11. #168
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    Quote Originally Posted by iointerrupt View Post
    I'm a little late on this, but, I've kicked around the idea of doing a Fadal VMC15 LinuxCNC retrofit.

    The X,Y,Z servos are simple enough, no worries there.

    The ATC gets a bit harder. LinuxCNC supports ATCs well in theory, but figuring out how to interface to the actual ATC motor/servo would take some doing.

    And then for the ATC you also need to get Spindle Orientation interfaced in too, and doing that seemed like quite a hurdle.

    Finally, my machine has two speed spindle, and figuring out how to interface with that was still another unknown.

    So overall, I felt the risk of starting on the retrofit and then hitting a wall was too high. But if somebody else has gone through it and documented some/all of those problems, that might make it more reasonable to attempt.
    Tool changer is not that bad, just a remapped m-code does the trick. I just haven't had time to button mine up on the Hurco.
    Do you have a spindle orient command on your spindle drive? If you do it's super easy for that portion, in the modified m-code for the tool change, you will have a spindle-orient command output, then spindle-is-oriented input to confirm it did. I have a Yaskawa CIMR spindle drive which deals with the orient and not the control.

    M Codes



    Sent from my XT1650 using Tapatalk

  12. #169
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    Fadal logic is something like this:

    Turn on spindle CW, zero speed, until it sees hall sensor, then engage spindle brake.

    If it sees hall sensor again and it doesn't stop, rotate CCW until it orients to the sensor.

    If it continues this for a couple iterations, call a tool change failure.

    Once oriented, command ATC IN

    Wait for ATC-IN hall sensor trigger.

    If no trigger after time, call ATC failure.

    Once ATC IN, unclamp tool.

    Move to tool clearance height.

    If spring-loaded ATC pivot shaft switch is triggered, call failure. (this is what happens if the tool sticks in the spindle)

    Tool is in carousel at this point.

    Index ATC to next desired tool, watching hall sensor for geneva index. If geneva doesn't index after given time, call index failure.

    Once at desired tool pot, bring spindle down to HOME, when X.XXX above home, begin tool clamping.

    If HOME move failure, tool change failed.

    If hall effect sensor on drawbar is still asserted, call tool change failure.

    Retract ATC, look for ATC-OUT hall sensor, if no asserted within time limit, call ATC fail.

    Tool change complete.

    This is what I've observed on my machine. The orient is done by having a "zero speed" setting of 2.5-5hz in the VFD. When 0v is sent to the VFD, and a direction is commanded, it spins at the "zero speed" setting, causing an orient.

    I don't know if many modern VFDs have this capability.

    A way to emulate this with a modern VFD is to have a board/device that looks at the dir/speed signals and tells the VFD to use a different map depending on orient or non-orient mode. Many have multiple settings that can be triggered by an external input, causing the min/max speeds to be different depending on which map is chosen.

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