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ot---vintage bar feeder

JHOLLAND1

Titanium
Joined
Oct 8, 2005
Location
western washington state
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
 

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2---------

pics of feeder chuck teardown---unit was completely frozen
 

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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
 

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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.
 
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;)
 

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