Hello to the users and I do apologise if I did not post my question in right place.

As I know nothing about cnc routers I have a couple of questions and hope somebody can advice me.

I need to use cnc router to cut plywood (thickness roughly 12-18 mm) - different irregular shapes (catted through) as an elements for furniture. I found 2 I consider to buy and it would be great if somebody could share opinion about those 2 products:

- https://www.ebay.co.uk/itm/cnc-3-axi...Condition=1000

or:

- https://ooznest.co.uk/product/ox-cnc-full-kit/

And a couple of very silly questions from beginner:

- how my work piece would be secured to the bed? would I need to clamp it somehow?

- suppliers in theory of they specification says e.g. 15 mm thickness - very seldom its true - it can be slightly more or usually less - how machine would cope with this? - does it measure actual thickness of the material to avoid over cut / damage to the bed or avoid not full depth cut?

- assuming workpiece is somehow clamped to the machine and when it makes final cut along designed shape (as far as I know it would cut in a few goes) to get through at this stage catted of piece is no longer attached to the whole piece - will it stay safe on the bed ?( without risk of fly away?)

Thanks for your help,*

Shem