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Worked on a hotel remodel once where the GC wouldn't Xray. His guys would drill a bunch of small holes with a root hammer and punch out the center. Worked great as far as the cables went. Not so good if you count the power line to the service elevator. Served the cheap bastard right.
Rick two things. 1) have you used the hilti machine. 2)How do you keep the water to the tube doing an overhead vertical core. Never done this nor had the requirement but always interesting to know what to do should the occasion arise
but on the Milwaukee drill, the water enters through a water jacket just under the arbor. It's threaded on. Remove the water jacket by untreading. Then make an umbrella with plastic drop cloth. Let it drap over the entire drill body to protect it from the water and slurry entering the machine.
if you don't want to remove the water jacket, carefully cut the plastic around the water jacket and duct tape around the plastic to the jacket body to prevent any seepage.
for safety, make sure your machine is properly grounded and gfic protected, also the added weight of a full core bit of water. Double bolt your macine into the ceiling or use the jack screw to help sipport it. Safety chanin will also prevent a very expensive repair to the machine and you too.
upside down drilling is not too common, but is sometimes needed to allow a fitting to be raised into the ceiling of the overhead slab.