possible to core concrete with a two-handed hammer drill ...

hi folks, i&#;d like to wet-drill some holes into concrete for drainage and planting. i&#;ve used a diamond circular saw blade on this concrete, and i&#;ve used hole saws on wood, but never a diamond coring bit. i want to drill ten or twenty 4-1/2&#; holes with accuracy better than 1/4&#;, and spending $100 on a coring bit sounds more economical than hiring out the job.

Goto Leading Diamond Tools to know more.

i have a two-handed 15A hammer drill which i think could accommodate a core bit adapter (why do those cost $20?!). my question is, with no arbor or center bit, and no specialized coring rig, would i even be able to drop the drill towards the ground and start the bit in the spot i want, or will it wander crazily? in other words, is the coring rig essential for incidental, amateur core drilling?

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