Pat
With the disc sander on the radial arm saw be advised that the mastic holding the sand paper to the metal disk can become hot and lose adhesion if used improperly. The resulting " twack " of the sand paper hitting your midsection is not really a pleasant sensation or one which is looked forward to.
Welding shops have portable stand screens.[ safety codes to prevent flash ] They may be made of anything from plywood to canvas on a castered frame. Metal roofing on a frame with casters may be one way to go or tarps hung from the ceiling with a rollup feature may be another thought.
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