A bud asked me to come over & look at his lathe a South Bend 9A . It's one of the fancy
ones large dials , spindle cover on the headstock & came with a taper attachment . The
Numbers on the change gear plate xx8344ZD I cant read the first two digits . Ok so now the the problem , the carriage
will only move @ 3/4"- 1" . The hand wheel for moving the apron will turn from @
one o-clock to 12 o-clock on , so not even a full revolution .We removed the saddle & the
lead screw support thinking we would be able to slide the apron off the lead screw but
no go , it will still only move the same 3/4-1" & stop & its a hard stop . So next we removed the taper pin holding the hand wheel on & pushed the pinion shaft into the apron so
the pinion gear had no contact with the gear that contacts the rack & still no
movement only the 3/4" - 1" . When it stops it's like it just hit a brick wall , it's a hard stop We tried spinning the input gear for the gearbox to try
to drive the apron off the leadscrew but the bolt the holds the gears on loosened so
that was a dead end . I marked the gear that runs in the rack & in the almost full
revolution the handwheel makes the rack gear only moves @ 1/3 of a revolution .
Unfortunately the unit is stuck maybe a quarter down the leadscrew from the gearbox.
We were hoping we might be able gently push the right side of the leadscrew down
enough to disengage the rack gear from the rack to slide the assembly off , but it's just to close to the gear box & don't want to bend the leadscrew . I've had one of these lathes into
as many pieces you can get with out removing the feet & I'm at a loss as to what the problem just might be . We left the required parts reinstalled for the weekend so we could think
about this some more . I'm going to borrow a bore scope & see if I can see any more but
I'm at a loss on this .
Any of you folks have any ideas ?
sorry for the paragraph spacing , I copied & pasted the whole text & something got lost in the translation
thanks
animal
ones large dials , spindle cover on the headstock & came with a taper attachment . The
Numbers on the change gear plate xx8344ZD I cant read the first two digits . Ok so now the the problem , the carriage
will only move @ 3/4"- 1" . The hand wheel for moving the apron will turn from @
one o-clock to 12 o-clock on , so not even a full revolution .We removed the saddle & the
lead screw support thinking we would be able to slide the apron off the lead screw but
no go , it will still only move the same 3/4-1" & stop & its a hard stop . So next we removed the taper pin holding the hand wheel on & pushed the pinion shaft into the apron so
the pinion gear had no contact with the gear that contacts the rack & still no
movement only the 3/4" - 1" . When it stops it's like it just hit a brick wall , it's a hard stop We tried spinning the input gear for the gearbox to try
to drive the apron off the leadscrew but the bolt the holds the gears on loosened so
that was a dead end . I marked the gear that runs in the rack & in the almost full
revolution the handwheel makes the rack gear only moves @ 1/3 of a revolution .
Unfortunately the unit is stuck maybe a quarter down the leadscrew from the gearbox.
We were hoping we might be able gently push the right side of the leadscrew down
enough to disengage the rack gear from the rack to slide the assembly off , but it's just to close to the gear box & don't want to bend the leadscrew . I've had one of these lathes into
as many pieces you can get with out removing the feet & I'm at a loss as to what the problem just might be . We left the required parts reinstalled for the weekend so we could think
about this some more . I'm going to borrow a bore scope & see if I can see any more but
I'm at a loss on this .
Any of you folks have any ideas ?
sorry for the paragraph spacing , I copied & pasted the whole text & something got lost in the translation
thanks
animal