Axis scaling errors - is this just to be expected with C7 screws?

[cropwell]

Hi Again,

If you have any twist in those gantry rails it will be magnified by your lanky gantry. If you clamp a large engineers square to the gantry side, you will see by running a DTI fixed to the Z, along the edge of the square whether there is any twist you could shim out.

Cheers,

Rob