A pillar drill can cut through almost any material if the speed is correct and the appropriate drill bit is used.
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yes it can, i am a college in uni studying D.T and yes it can
a pulley gearing is the top of a pillar drill and it helps to pull down the chuck.
Because it's on the floor and a bench drill is on the bench.
A pillar drill is used for larger holes, more exact placing of holes, or drilling repeated holes with a jig to insure uniformity.
The colour is irrelevant , that just depends on the manufacturer. To cut through concrete you need a 'carbide tipped' drill bit. This tip is a little wider than the drill bit and is quite obvious.