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  1. #1
    Join Date
    Apr 2009
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    Kingswood
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    680

    Default Turrett Mill Lubrication

    Got the lube working to the knee and screw on my Kondia CNC mill, ISO 68.

    Tried oil meter size 0 directly (no tubing) on the original Bijur pump, nothing comes through at all.
    Yes, I did wait a good length of time, not a drop out and the pump handle did not move.
    When size 2 tried, flow was good.
    The meters were supplied by Arceurotrade a few years ago.

    Is it possible the Bijur pump pressure could be too low, by design or age ?

    The oil passages were blown out with the knee loose (no gib) and they all seemed good.
    When connected, the slides get adequate oil, but the dovetails are definitely much lower, but usable.
    If I ever have to remove the knee, I will drill additional passages and have separate meters to the slides and dovetails.

    Installed a meter size 1 to the screw.
    Interesting to note that when the knee was gib-less and the screw liberally lubricated by hand, I could spin the Z axis drive pulley and the screw would continue to coast for several rotations.
    It doesn't coast with the gib fitted, but the feel from the pulley is good.

    Now working on the saddle.
    The X-axis has one meter per side, with an internal "T" passage to get oil to the slide and dovetail.
    The Y-axis has one meter per side, but no internal "T"passage, and no delivery to the dovetails.
    Perhaps it is normal to apply lube manually to the Y-axis dovetails.

    Is it normal not to supply the Y-axis dovetail ?

    John.

  2. #2
    Join Date
    Aug 2011
    Location
    Melbourne
    Posts
    4,243

    Default

    My mill has 6 lube points inside the saddle. Fed by 6 No.3 metering valves.

    2 for the X
    2 for the Y
    and one each for the X and y leadscrews.

    At work atm but from memory the oil is injected at the dovetails and gravity allows it to flow onto the flats.

    Simon

    Sent from my SM-G970F using Tapatalk
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  3. #3
    Join Date
    Aug 2011
    Location
    Melbourne
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    Default

    Ok. So here are a couple of pics of the saddle lube setup on my spanish made pacific (aka Lagun) mill.

    The X lube is feed directly to the flats. The flats also have channels milled into them to transport the oil along the entire length of the ways. These e channels also have another channel to the edge so that oil can then flow into the dovetails.

    The Y is a little different. It is fed to both the flats and the dovetails via two small holes that connect inside the saddle (see pic 2)

    Hope this helps.

    Simon

    Sent from my SM-G970F using Tapatalk
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  4. #4
    Join Date
    Jun 2012
    Location
    melbourne
    Posts
    315

    Default

    I did this at the time so i'm not relying on memory (so it might be right). The lines are supposed to be 3d showing perspective, if you can figure it out. Dotted lines supposed to show where the oilway is drilled inside, out of view.
    20170609_101820.jpg

    I didn't draw one like that for the knee unfortunately. Regarding the knee, I seem to remember that blowing out oilways without disasembling will not help because of how the holes are drilled and they interlink with the holes drilled for the gib adjuster.
    I don't have any good photos of that side because my cellphone had burst but this looks like a hole in the side of the way which would supply oil, especially since its in line with the oil hole on the face of the knee. When its all apart though, the air will lose pressure and go through the adjusters, which are also oiled I think. I can't remember if there was a slot in the gib to let oil through.

    20161227_162822.jpg
    Also, I was advised that to set the knee gib, set it with an indicator and adjust it to just before the point where the knee will just stop dropping under its own weight and won't move down until the screw slack takes up and pushes it down. (I'm sure everyone will have their own method but this was from a guy I have a lot of respect for) The point being the gib pressure will affect how loose the knee seems.

  5. #5
    Join Date
    Aug 2011
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    Melbourne
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    Looks about right. Your lube setup is alot more elaborate to mine. I like the fixed copper lines, much better than the poly. So WRT the X ways, yours has a hole drilled in the top to allow oil to flow down though and into the dovetails. Mine simply has a milled line to the edge of the flats that allows the oil to flow over and down the dovetails. Different idea but same result.

    Everything else seems to be roughly the same apart from the actual plumbing of it.

    Simon
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  6. #6
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    Jun 2012
    Location
    melbourne
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    315

    Default

    yes they are basically the same. I forgot the whole point which was the oiling for the Y axis is exxactly the same as for the x axis, and you can see in the photo with the red arrows (previous post) where the oil is fed down to the Y axis. Here's the Y axis. One of those holes (each side) goes right through to the X axis oiling. There are the same type of holes drilled into the dovetail section as in the x axis. I think we are all saying the same thing. I should have said, this is a kondia mill also.
    20161221_194732.jpg

  7. #7
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    Quote Originally Posted by electrosteam View Post
    Got the lube working to the knee and screw on my Kondia CNC mill, ISO 68.


    Is it possible the Bijur pump pressure could be too low, by design or age ?

    John.
    Not sure about this. If the spring has fatigued to the point where it no longer produces the required pressure then maybe? I had similar thoughts with my pump and lube valve proportioners too. However, since I have sucessfully cleaned them, the pump handle eventually returns to the fully retracted position after about an hour. Previously it took maybe a couple of days and even then, I think it may have been more of a case of internal pump leakage rather than oil flow to the ways. I have noticed (with the lube system disassembled) that if Iapply extra pressure to the pump handle I can increase the oil flow through the proportioners so the system flow is dependent on the pressure applied by the pump spring.

    Simon
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

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