Drill for core and sds

[NDG Elecs]

so once half way through first brick bang the rest out (with chissel sds bit) and then re-insert the core again?

Yep Davey, can do it that way. I normally drill straight through the entire wall. Then using pilot drill and the core, core drill into the wall around 4cm on both sides. Then knock the rest out with the SDS chisel. This technique is especially good when dealing with hard engineering bricks, unless you enjoy standing motionless holding a drill for another hour!!

you end up with clean entry and exit holes and the 4cm gives enough depth to get your red plugs into the surrounding brick.

 

[NDG Elecs]

Now that's a core drill!

Like it!

Geordie, out of curiousity why would you need to core a 3ft(?!) hole like that....looks genuine and can't think why the brick would not just be knocked out instead....air conditioning ducts....big cat flap.....?

 

[Geordie Spark]

Like it!

Geordie, out of curiousity why would you need to core a 3ft(?!) hole like that....looks genuine and can't think why the brick would not just be knocked out instead....air conditioning ducts....big cat flap.....?

I made one 3ft diameter which was mounted on the back of an army truck with an air compressor to supply the air to run the compressed air motor driving the rig with another truck which was a water bowser supplying water to keep the core cool.

That little toy went to the then London Airport to drill holes in the runway to mount the new fangled landing beacons in.

That was about 1974 and this diamond drilling & cutting lark was quite new. Cutting edge technology you could say.

You "could" just knock it out but believe me these beasts don't hang about and that hole would be made with nice clean edges faster than it would take you to make good your knocked out one.