Hi all i have an old Tomotek Tekcel T Series cnc router and every now and then i get this bad chatter issue.

Its not all the time although could relate to weather conditions i haven't taken a great deal of notice.

But when cutting, or even jogging above the table, in 1 direction it sometimes makes this extremely bad vibration resulting in chatter and tooth marks in pieces.

Under the machine the 2x 25mm leadscrews vibrate a lot when this happens.

I'm not sure if its bearings on the linear rails or if its more an issue with the ballscrews.

Any advice on where to start would be great if anyone might have some knowledge or logical explanation as to what they think might cause this issue.

Please see the attached video



Thanks for your time