Core drilling

[Tap dancer]

tungstan carbide core drills are rubbish you need diamond

They would be OK for a DIYer who is only going to instal one boiler and needs to drill the flue hole ;-)

 

[kozak1968]

Dont buy the Dewalt D21570. My one done the bearings in 6 months. Dewalt repaired it for free, but i had to drive 15 miles to Croyden to get it to the repair centre. Now i have had it back about 2months and it is noisey again, its got a clutch that snatches really bad. It cost just over £200 but i think you need to spend at least £250 for a decent one.

 

[Dannypipe]

Thanks for that. The Dewalt one I was gonna buy was £209 so prob same drill. Haven't checked the number (it's in the Screwfix catalogue).

When you say the clutch snatches, I think that is a good thing. Clutches on most drills are too weak. If you're core drilling you want it the clutch strong enough to protect the core drill connection in the chuck, but you should be strong enough to hold on to it.

Once, I used a big drill with no clutch, coring a 120mm hole. It snatched and snapped the bit in half, after chewing it, and giving me a big shove! Dangerous!

 

[Tap dancer]

Ever tried using a large core drill without the central pilot drill? I saw a plumber do it once, it was frightening.

 

[woodytheplumber]

mate of mine is a kitchen fitter i lend him my 5 inch for extractors and he refuses to use the center drill at all and never spins and marks any other bricks? crazy i use center drill untill dimond is fully into the brick then remove works for me. used to use a old direct power sds from screwfix lasted me 2 years and cost me £35 now have the hilti with vacume system and water feed its the dogs!! guess thats what happens when working for a tool hire center who refuse to pay!

 

[SafeGasInstall]

Can u get me hilti vacum extracter at goood price ???
i have dd110

 

[REDSAW]

Ever tried using a large core drill without the central pilot drill? I saw a plumber do it once, it was frightening.

didnt know you were supposed too?

 

[Dannypipe]

didnt know you were supposed too?

Me neither!! LOL.

I remove the pilot after it's bedded in, as it's not doing anything after that.

I want that Hilti system. Sounds like the mutts danglies.

 

[WHPES]

Powerful Hilti SDS which is designed to do coring as well. Expensive investment but will last a lifetime and drill holes and chisel as well as cut cores.

I have a "V" shaped piece of wood and start in this instead of centre drilling

 

[Subby]

I have a "V" shaped piece of wood and start in this instead of centre drilling

How do you do this? I am intreagued