Help please. Dip switches and mach 3 settings

[dazp1976]

Hi.
I.m getting there with the mach3 reading, and also I did a few small carvings to test some speeds and feeds. All goes well so far.
What I.m not sure about, and the opinions are diverse, is: Do I need any lubricant for the ballscrews?
There are people who say it is not a must. Others say it is. Some say to spray it. Some to put in inside the nut. I.m a bit confused, and the book does not seem to cover this topic.

I would say yes, especially if they're bearing ones.
I use 68 oil and brush it on the screw at the moment.

Plan for the next is to fit some elbows/tubing, run the tube to some zerk (grease point) fittings at the machine base so I can just pump grease straight in the nut from there.
That's until I get my oiler/manifolds built/set up.