VN 22LU lower saddle removal
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  1. #1
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    Default VN 22LU lower saddle removal

    Hi,

    I'm working on my VN22LU, attempting to remove the lower saddle. As the nut and power feed spline shaft housing is screwed into the lower saddle with unreachable screws, I assume the only way to remove the lower saddle is first to remove the two shafts.

    Opening the knee:

    knee-1.jpg

    Removing the next level of plate holding the various bearings
    and shafts:

    knee-2.jpg

    Note for anyone else doing this, there is a ball bearing and spring
    detent for the saddle feed stops in the top left corner, assume the
    bearing will go flying:

    knee-3.jpg

    Now, I am attempting to remove the shaft which has the acme thread
    to the saddle nut, which is the top shaft second from the right. However
    there is a shifting fork, to remove that the rear saddle feed needs
    to be removed and the internal cross-shaft needs to be pulled out:

    knee-4.jpg

    So now I can unscrew the acme thread shaft, up to the point one of the
    gears is blocked by the remaining internal plate.

    I'd prefer to not have to extract those several shafts, etc. If anyone
    has done this before and has some pointers that would be great!

    -Phil

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  3. #2
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    I determined the front and sub-plate probably come out together, so I
    re-affixed the two with the 3 central hex bolts, and put threaded rod
    into the bolt holes that would affix the outer plate to the knee.

    knee-shafts-1.jpg

    then, carefully align the front feeds speed gear tumbler so the teeth
    are not obstructing the movement of any shafts coming forward, this is
    hard to see up into the knee from below.

    carefully cranking the saddle crank, together with tapping / prying carefully
    at the locating pins and other locations, keeping the fork for the saddle
    power feed central to avoid engaging the other gears.

    knee-shafts-3.jpg

    At some point almost ready to come out, the entire package would come no
    further, so I separated the front plate with the 3 bolts, and removed it.

    knee-shafts-6.jpg

    with the outer plate removed, the two top shafts (acme thread and spined
    shaft for driving the saddle) can come out.

    knee-shafts-7.jpg

    throughout this, carefully watch the clutch plates, as they seem very fragile. One section of the frontmost clutch plate was cracked and broke out on mine.

    Finally I'm left with just the sub-plate in the knee, which is loose but the clutch plate assembly is too large a diameter to exit through the front.

    knee-shafts-9.jpg

    Anyone know how to separate the rear clutch plates, other than removing the nut holding the parts together?

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  5. #3
    Join Date
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    Default

    Removed the lower saddle finally after removing gib.

    Underside of saddle has some fairly deep (probably .010"?) scoring.

    dovetail-wear-2.jpg

    The dovetail top surface had been badly scored, and some previous "repair"
    had installed a .025" sheet, pinned into the dovetail itself.

    dovetail-wear-4.jpg

    Removed that, and stoned flat the pins and the whole surface.

    dovetail-wear-3.jpgdovetail-wear-1.jpg

    So now, with saddle back on the badly scored ways, nevertheless,
    indicating against the underside of the ram, I get somewhere around
    .001" over the entire knee! So interestingly when the sheet metal
    was still on, the saddle movement indicated .005" front to back, but
    it seems most of that variation was the sheet, or debris under it, etc.

    dovetail-wear-5.jpg

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