[Azalin]

They keep loosening because if I overtighten the screws then the carriage gets too tight. If I tighten just enough then screws gets loose in time and by vibration because the screws never gets locked.

What would you suggest about this?

Thanks,
Suat

Sent from my MI 5s Plus using Tapatalk

[kawazuki]

I assume your gib adjusting screws have lock-nuts - if not, then fit some! No reason for vibration to affect them then!

[Azalin]

Hi,

I mean these bolts. And two on the other side.

[kawazuki]

Those aren't actually the gib screws - they are screws used to hold the pieces that holds the piece that hold the gib piece in position. All a bit overly complicated!
The gib screws are adjusted from below as they push the gib upward to the underside of the bedway - the exploded parts diagram in the manuals give a better idea.
As they are just retaining screws, a dose of Loctite should stop them backing out - as an fyi, mine have never backed out in 10 years!

[Azalin]

Thanks @kawazuki