Hello,
I tried to drill a hole through a 500mm concrete wall yesterday. I was hoping to put a 15mm copper pipe through to an outdoor tap (you may remember my other thread about the old pipe freezing and bursting).
I was unsuccessful. I used an sds drill and I got through the wall quick enough but although I (thought I) held the drill level, the exit hole and the entry hole were at two different heights and passing a pipe through was impossible.
Now that I know from the "one metre drill bits at Aldi" thread that these bits are flexible, is it possible that the bit deflected inside the wall?
How can I prevent this in the future? I drilled from one side straight through. Should I have carefully marked each side and drilled from each side, hopefully meeting halfway?
For drilling though brick I have used a 16mm bit for 15mm pipe in the past. Do I need to use something bigger than 16mm in concrete to allow for it not being straight?
I was using a 6kg Titan drill I got from Screwfix some time ago. Despite being a budget model it has served me well. I had a Bosch drill bit in it. I had not used the drill bit before and I won't be using it again as the end broke. I had expected better longevity from a branded bit. Are the clutches on sds drills like those on cars, i.e. do they wear out eventually? I ask because mine worked once or twice yesterday ;(
Thanks, Stephen.