M10/M20 J3 Grease Posture

    So the manual states when greasing J3 that J1 degree is arbitrary, J2 should be at 0 degree and J3 needs to be at 0 degree. When doing so, the grease coming out of the J3 exit port wants to go down and inside the arm. My question is, why can't J2 be at -90 and J3 be at 90? The relationship between J2 and J3 is the same, but the grease would just fall straight down into a bucket making collection/cleanup so much easier. At first I thought that maybe gravity would somehow prevent fresh grease from properly flushing out the old, but if the robot was all mount and I followed the Fanuc instructions of J2 0, J3 90 then it would essentially be the same thing.
    Am I missing something obvious?
    Thanks

    The reason to follow the positions indicated for greasing is because the track that the grease will follow between the inlet and the outlet is the maximum or the longer. And with this, you replace the most quatity possible of grease.
    If the inlet and the outlet are at the same level, the grease replaced is minimum.

    Obviusly, not all the grease inside of the reducer cavity is replaced.
    What I do is after greasing, we move the axis a couple of minutes, so the old grease mix with the new, and then lubricate again the axis. This is to pretend that most of the grease inside of the cavity be new

    Gotcha. Just looking it it though, when J2 and J3 are 0 degree, the relationship between the two are the same as if J2 is -90 and J3 is +90. That puts J3 at a right angle to the J2 arm. Kinda weird...

    In the end, I'm just looking for easier/cleaner methods to do mtc. Trying to stop the grease coming out of J3 from going down and inside the arm is a PITA. And on top of that, there is nothing you can do to stop it from doing just that when you run the robot with the ports open to relieve pressure. I really feel like a tool when I have to ask an operator to clean up the mess.

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