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This is probably a stupid question but the longest core drill bit I can see is on a 300mm arbor - would that be right, that's the maximum depth you can go?
The core drill we have is the same as the hire companies hire out, a Weka. Core barrels are 450mm long and you can put as many 300mm long extensions on as you want. The thread on them is 1 1/4 UNC IIRC.
In built water feed, knock the socks off DIY stuff. Has a clutch on so you dont spin round the drill if it snags. Worth the hire costs, takes the hard work out of it. Will drill straight through rebar as if it wasnt there.