[TimT]

Years ago I built an box out of plywood to house a compressor, complete with casters, I insulated the box to cut down the noise while the compressor was operating..(had an opening in the back for air exchange..)

Part of my idea was to be able to use the top of the compressor box as a work surface...

Well even with the caster locked, when the compressor was running the box walked... and anything I left on top did the boogie woogie...