Other Sports1 min ago
Drilling Through Manhole Cover Update Fao Builder Please
Thanks for your advice. Bricks are now lifted and relaid loose with drainage gaps. I tried drilling holes in the base of the cover (its solid, not mesh..it blooming would be!) but the bit wouldn't bite. Its a decent quality bit, Black and Decker, for drilling metal and the drill is a mains powered De Walt with plenty of oomph.
Do I need to buy a better bit and if so what please? or am I doing something wrong?
Many thanks
Do I need to buy a better bit and if so what please? or am I doing something wrong?
Many thanks
Answers
Best Answer
No best answer has yet been selected by woofgang. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Cast iron can be tough. Yes I think new bits might well help. So might trying a pilot hole first ? I'm unsure what qualifies as better though. I tend to go with the thought that you get what you pay for, and invest in the dearest in this sort of situation, even if there is a chance I'm being ripped off. Would a centre punch make an impression in the cast iron ? If the issue is the bit slipping it may be worth a try.
I'm thinking a centre punch and smallish drill bit to start the holes might be the answer. The metal is probably galvanised and this can act something like a lubricant so the bigger bit skids about instead of biting in. A few blows on the punch to make a decent dent might help. But as the Judge says, beware the punch doesn't shatter
Sounds like galvanised steel, Woofters.
I agree with a pilot hole first. It really does make it easier. A brand new 4mm drillbit for steel, followed by a 6 or 7mm bit. Then maybe a 10mm to finish.
Grip the drill very tightly in case the bit catches in the steel and tries to wrench your arm off.
What diameter bit are you trying with?
I agree with a pilot hole first. It really does make it easier. A brand new 4mm drillbit for steel, followed by a 6 or 7mm bit. Then maybe a 10mm to finish.
Grip the drill very tightly in case the bit catches in the steel and tries to wrench your arm off.
What diameter bit are you trying with?
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