[suspension]

It makes aligment easier when you can first align the rails. Then you can bolt your table onto the intermediate plate and shim that / surface it so that it is aligned with the rest of the machine. You need to design a machine that is adjustable so that you can fine tune the alignment. Once one parts is aligned, you are able to "lock" that part and move on to the next, without affecting already done alignment. One example is to use an intermediate plate between the gantry axis and the spindle axis. That allows easier tramming.

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Sorry I dont understand.
Once I get two linear rails parallel to each other, their bearing blocks will also be parallel and their top surface will be at the exact same height. If I fix a T-table which has precision top and bottom surfaces on rails blocks, I will get a top surface which is parallel to rails. Not sure why I need a plate in between these two in this case.

[NordicCnc]

Sorry I dont understand.
Once I get two linear rails parallel to each other, their bearing blocks will also be parallel and their top surface will be at the exact same height. If I fix a T-table which has precision top and bottom surfaces on rails blocks, I will get a top surface which is parallel to rails. Not sure why I need a plate in between these two in this case.

Then you can skip the intermediate plate.

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