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My new to me Fadal VMC3016L is alive, but with one small problem. There is some serious scoring on the z axis ballscrew in the tool change area of the screw.
http://i445.photobucket.com/albums/q...ise/Screw1.jpg
http://i445.photobucket.com/albums/q...ise/Screw2.jpg
The screw is also noisy and especially noisy at the top of its travel. It's also a little loose and the brass coupler has some play in it. I'm going to replace the screw, thrust bearing, and the coupler. I'm also updating the coupler to the newer phenolic coupler.
Any ideas what could have caused this damage? I wonder if the previous owner cold started with the z in the wrong place and crashed the z while doing a toolchange.
could be a few things but judging by your chip thread I would say chips got bound up in the ball screw nut,or could be no oil,,tunning pure ater with no coolant,theres a host of things.
A crash will not hurt the brearings in the ball nut unless it bent the shaft. other things will usually break before that.
I agree with Delw... not that's its a big thing... ...clean out the mashed chips using aluminum or some soft metal.
Your problem sounds two fold. Chips are mashed in the ball screw thread and bad thrust bearings. Replace the thrust bearings. It's a common problem.
Basically a cheap fix...if that fixes it... post. If it doesn't... post also.
Steve (the old guy)
lack of lube oil (look rusty
In the pics it looks like there is aluminum mashed in the ball screw thread, but metal is actually missing from the screw in those spots. The screw is noisy through out it's entire travel too.
The lube system is working. All we did so far is clean the sludge out of the bottom of the tank. I have new filters for the pickup and filter, but we didn't get them installed yet. We verified that all the screws and rails are getting lube.
Seen screws like that before, even one on a mori. My guess is no lubrication, however it could be a hardening problem with the screw. I don't see aluminum mashed up, I see bernaling of the hardened surface.
make sure the lube pump is getting to 250psi+ and holding it for 5-10 seconds.if it does not,there is a leak or bad pump.
The 250 psi spec is for boxway machines correct? This one has linear guides and the pump builds approx 50 psi.
The 250psi is for the air operated pump,i have seen some old motor style with the pump handle on some linear machines,depends how old the mill is.50 psi should be ok on the old pump as long as it holds pressure for a few seconds.you can always pull the line off of the screw and see if it is flowing.
The machine is a 2001 and it has an electrically operated way lube pump from Bijur.
I verified that the lube system is working by checking for oil tracks on the guides and screws when we had all the way covers off.
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