I want a vacuum table!

[firetrappe]

I'm also looking at vacuum beds. I only need to hold down sheets of foam rather than MDF, but I thought you might be interested in a bed that a friend of mine made which uses a vacuum cleaner.

His uses an MDF torsion box bed with a matrix of holes and grooves in the top. The vacuum is split between the bed and an extraction hose which keeps some airflow going to the motor.
He uses a sacrificial sheet of foam (depron) with an identical matrix of holes cut into it. The grooves in the bed hold the sacrificial sheet down and the holes provide suction for the sheet being cut.

Surprisingly it works pretty well and prevents the sheet being cut from moving laterally. I doubt very much that this setup would work for MDF, but it might give you some more ideas.

Si.