I had the tail stock of a Daewoo Puma lathe off for refurbishment recently. Oil to bearing face of the Gib was via hole drilled through the Gib (back surface to bearing surface), with an 8mm wide by circa 40 long, shallow slot cut in the back surface; the through hole was position at the slot's mid length. Obviously, the 40 long slot was to accommodate the varying longitudinal position of the Gib over time; where just a through hole would be unlikely to line up with the outlet from the oil gallery. The through hole in the Gib exited on the bearing side mid point of a distribution track cut in the bearing face of the Gib.
This design of conveying oil from the oil gallery to where its required at the bearing face of the Gib is fine, provided that the hole and slot are machined in the correct position. A Gib is assembled with it's mating parts in only one way. The through hole and slot were machined so far out of position that no oil whatsoever would make it into the shallow slot and then through the hole to the bearing surface. Accordingly, no oil would have made it to the bearing surface at any time since manufacture of the machine; it seems like the hole and slot location were dimensioned from the wrong end of the Gib. Given that this part had all the looks of a CNC machined component; slot and hole with a uniform chamfer etc., I suspect that many, if not all, machines of this type made around the time of manufacture of this machine, would have been the same.
Regards,
Bill
This design of conveying oil from the oil gallery to where its required at the bearing face of the Gib is fine, provided that the hole and slot are machined in the correct position. A Gib is assembled with it's mating parts in only one way. The through hole and slot were machined so far out of position that no oil whatsoever would make it into the shallow slot and then through the hole to the bearing surface. Accordingly, no oil would have made it to the bearing surface at any time since manufacture of the machine; it seems like the hole and slot location were dimensioned from the wrong end of the Gib. Given that this part had all the looks of a CNC machined component; slot and hole with a uniform chamfer etc., I suspect that many, if not all, machines of this type made around the time of manufacture of this machine, would have been the same.
Regards,
Bill