Hi Cliff, I have watched most of your videos over the years.
I will upload some pictures later this week, but so far the Z screw is in great shape. The X is in good shape, it has galled balls and they will be replaced. The Y is in quite bad shape, the balls are worn and there is some damage to the screw. It is near the end of the travel, probably at or past the limit switch, so I am not going to worry about it. Even the bearings on the Y were in bad shape. I am not sure what explains that, they are fairly isolated from debris. But they were packed full of junk.
The Y bellows on my machine are in good shape, but could have been replaced at some point.
I suspect a part of the Y screw being in such bad shape is the hole that can be seen in the following shot:
The hole is in the mounting bracket for the X screw and allows oil (and whatever it picks up) to drain right on to the Y screw.
That hole is in a raised section of the casting, for the X screw to mount to, so it can't drain the saddle until it is flooded. On my machine, there was quite a bit of oil draining down there because I was losing a lot of my oil out the X (all) ball nut.
Other than the impact mark on the X ways, both X and Y do not show a lot of wear.
The Z ways (turcite) are in bad shape from my inspection tonight. I took the Z off the machine. I will post pictures in a couple days.The right side appears to have run dry for a long time...
That was my thought too. I am glad to hear that a check valve works.
I have already purchased check valves and needle valves so I could try and get even oil flow to all three axis.
I will also be converting the screws to grease and have a pneumatic greaser.
I also have covers for the screws to keep debris out. Grease holds swarf/dust/etc in the nut better and can be worse than oil if not careful.
Thanks for the reply's.