What size drill ?

[scooby1]

I am about to hire a drill to drill some holes in a concrete floor in order to fix some 19mm threaded bar using the resin method. Can someone tell me what size drill I should be using please ?

Thanks for any answers. (and any tips !)

 

[Deleted member 174758]

A 2kg SDS+ drill should tackle that, a 3kg+ SDS drill would make a better job. You could also go for an SDS Max drill, but the drill bits are more expensive and a lot less easy to source. Make sure that you vacuum out the holes before inserting the rebar - too mush dust left down the holes will give you problems

 

[Jackrae]

Vacuum may not get all the dust out: although frowned on, a blast of air at the bottom of the hole will do a better job of clearing dust out

 

[Burnerman]

If its drill diameter you mean, rather than the machine power, I had to fix some 20mm dia bolts, and the recommended drill size was 24mm dia.
This was using Fischer Superbond, if I recall.
The holes had to be cleared by air.
John

 

[scooby1]

Sorry, perhaps I didn't state my question clearly enough. Yes, I really would like to now what size drill bit I should be using. I have a compressor that I will use to clean the holes out.

 

[Burnerman]

Its quite a science, the drill sizing as most recommendations are made considering a particular insert in mind......most of which compress the resin.
Thinking of the work I was doing, 22mm or 23mm diameter holes seem about right for you.
I believe Fischer have a technical help line?
John

 

[Deleted member 174758]

Vacuum may not get all the dust out: although frowned on, a blast of air at the bottom of the hole will do a better job of clearing dust out

Yes, but I'm sure you realise why I wouln't suggest that!

 

[scooby1]

The site is in my workshop and so dust is not a problem. Plus the fact that I have a helmet with a filtered air supply to a fan that pushes air down in front of the visor. I can also put a long blowpipe on the end of the gun.

Thanks to all who have offered help and advice.

 

[Monkeh]

If you blast air down the hole, hold a vacuum at the side as you do so. It'll grab most of the dust straight out of the air if it's decently strong.

 

[scooby1]

If you blast air down the hole, hold a vacuum at the side as you do so. It'll grab most of the dust straight out of the air if it's decently strong.

That's a good idea. And I do believe that Mrs. Scooby has an old vacuum cleaner that she doesn't use any more.