When Will This Vacuum Table Fail?

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When using MDF as a spoilboard on top of the vacuum table, I am assuming you use some poster board or something to cover the area around your workplace. Is this correct? How much bare surface can be uncovered before losing too much holding power?

kenarmstrong
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We have a large cnc with vacuum hold down
It uses a 3/4" sheet of MDF as the spoil board. Our xut depth is only 0.003 deeper than Z 0. So it barely scratches it. When it look too scuffed, i take a 0.004" smoothing operation to restore the spoil board to flat. This lets it lasts many months, unless i accidentally gouge it. Oops

michaellundgren
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can you use dust boot with vacuum going?

KimberlyWendt-lciv