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  1. #1
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    Default ot---vintage bar feeder

    22 years ago I purchased 1950's J+L turret lathe from Dept of Defense
    the saddle/carriage had been removed and cnc slant bed retrofit placed

    4.5 inch spindle thru hole

    included was hydraulic bar feed with passive-slave chuck which
    mounted into headstock bracket with 3 in bar stock

    for past 22 years machine has occupied shed--never used

    and the slave chuck oxidizing in underbrush

    but now lathe is needed to machine 4 inch driveshaft for fire truck conversion

    so I am in process of slave chuck teardown

    pics illustrate 7 inch j-l turret machine which is otherwise identical to the
    4-1/2 inch machine I reference
    Attached Thumbnails Attached Thumbnails j-l5.jpg   j-l6.jpg   j-l7.jpg   j-l-lathe.4.jpg   j-l-lathe.2.jpg  


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  3. #2
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    2---------

    pics of feeder chuck teardown---unit was completely frozen
    Attached Thumbnails Attached Thumbnails 100_3402.jpg   100_3397.jpg   100_3393.jpg   100_3408.jpg   100_3407.jpg  


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  5. #3
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    Default driveline lathe

    feeder chuck mostly broken down--all 4 jaws are solidly frozen--will likely require heat and solvent persuasion

    pics also illustrate j+l lathe ---spindle bore is 5 inches which necks down to 4.5 inch

    16 in 3 jaw chuck has bore of 4.5 in so the 4 inch driveshaft should pass thru
    spline end first
    this will allow chucking fixed yoke for parting operation by aloris tool which will be mounted on slant bed

    I placed step motors on axis ball screws 20 years ago --have portable control that
    includes motor drives and pulse generator---should function to separate yoke from tube---which will then be shortened 4-5 inches and yoke re-fit with mig weld
    Attached Thumbnails Attached Thumbnails 100_3432.jpg   100_3438.jpg   100_3439.jpg   100_3441.jpg   100_3442.jpg  


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  7. #4
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    I’ve seen one of those before at a driveline shop in Paradise, CA. Super nice piece of equipment to have on your machine. Sadly his shop burned down.

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  9. #5
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    Default pugilist persuasion

    what it took to liberate jaws from chuck body

    1---rosebud torch application to ~400F
    2---penetrant
    3---vigorous pounding--minimal movement
    4---fenestration of chuck jaw shelf extension---5/16" end mill
    drill thru---this worked with aplication of meaningful pounding

    I punched holes in outboard jaw slides with intent to repair with
    tig/mig and regrind

    but adequate unmachined support exists in jaw geometry for performance of my
    intended 100 rpm drive shaft modification---so repair effort is abandoned
    ---besides, one month from now the entire chuck assembly will be back in the weeds
    Attached Thumbnails Attached Thumbnails 100_3443.jpg   100_3444.jpg   100_3445.jpg  

  10. #6
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    Getting a little rough with the poor thing. A good 24 hour soak in diesel would do wonders for a lot of the more stubborn components.


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