I'm in the process of building a birch plywood CNC router 4x4 ft. with a 5x5 ft. 3/4" torsion box base.

I see MDF boards with t-slots cut and can't imagine it having enough clamping force. So for a spoil board I was thinking aluminum t-slot tracks with 3/4" MDF strips in between. Something like shown in this link...

https://discuss.inventables.com/t/fe...-board/27227/6

Is it enough to simply screw the t-slots into the torsion box? Will there be enough clamping force without pulling out the screws? What is a good price for 48" length aluminum t-slots?

The t-slots are ~1/2" high vs. the 3/4" MDF. Is 1/4" enough to dress out the board and have enough left over to run without nicking a t-slot?

For the strips of MDF what spacing should the screws/bolts be?

If you have a better spoil board ideal I'm all ears!