Any ideas ? I have an A4 gantry machine and when doing a fast travel in the + direction only, the Y axis makes a nasty high pitch juddery noise in two places on its' travel. I have almost had the whole machine apart and can't find any reason for it. The gantry seems aligned as far as I can tell using squares. The only thing I can think of is one of the linear bearings is causing the problem. If I put pressure on the gantry on the side that the noise is coming from it stops the noise.

Help please.

Rob