What size drill ?

[scooby73466]

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 !)

[GB_Groundworks]

hot many are you doing? do you own drill bits? do you own a transformer?

we use a hilt e75 ads max for big drilling just done 442 25mm holes x150mm deep in serious concrete, hilti drill bit was £280 alone

if only doing a few sds max be fine, get a clutched one to avoid snatching

either one of these http://www.hsstoolshop.co.uk/sds-max....3-p.asp

[scooby73466]

I have 8 holes to drill. But I don't think I phrased my question clearly enough. I really want to know what size of drill bit I should use for 19mm threaded bar. I don't have an appropriate drill for the job so have to hire. I do have a compressor to clean the holes out. Thank you.

[msh paving]

i would suggest 22mm to allow resin to get around it, don't the resin manufacture tell you? MSH

[GB_Groundworks]

we use 25mm drill for m20 threaded studs, old hoover is better compressor sprays dust in your face and the room (trust me i did it last week)

we use old hoover with bit of 22mm push fit pipe to suck them out and then once with the brush

for 19mm you want 22mm

with rebar doweling in existing concrete you can drill the same size then hammer in, love nor money or swearing will get them out

[scooby73466]

i would suggest 22mm to allow resin to get around it, don't the resin manufacture tell you? MSH

Don't know. Haven't bought the resin yet.

[scooby73466]

we use 25mm drill for m20 threaded studs, old hoover is better compressor sprays dust in your face and the room (trust me i did it last week)

we use old hoover with bit of 22mm push fit pipe to suck them out and then once with the brush

for 19mm you want 22mm

with rebar doweling in existing concrete you can drill the same size then hammer in, love nor money or swearing will get them out

The site is in the workshop so dust isn't a problem as such but I have read warnings about it. I do have a helmet with a filtered fan that pushes air down inside the front of the visor and I thought that would be O.K. Plus the fact that I can put a long blow pipe on the end of the gun.

[scooby73466]

Thanks to all for the help and advice so far.

[rab1]

just buy the resin and all is told on the package but my opinion only, hilti is the best but for a one off job buy a much cheaper drill bit and look at spit resin etc

[KLS]

we use 25mm drill for m20 threaded studs, old hoover is better compressor sprays dust in your face and the room (trust me i did it last week)

we use old hoover with bit of 22mm push fit pipe to suck them out and then once with the brush

for 19mm you want 22mm

with rebar doweling in existing concrete you can drill the same size then hammer in, love nor money or swearing will get them out

The site is in the workshop so dust isn't a problem as such but I have read warnings about it. I do have a helmet with a filtered fan that pushes air down inside the front of the visor and I thought that would be O.K. Plus the fact that I can put a long blow pipe on the end of the gun.

What Giles is saying about dust isnt for the dust that would fall out of the hole or that that would stay in the air, it's the dust that lines the hole once it is drilled; this needs to be removed so that the resin will stick to the wall as the dust would act as a bond break.



Edited By KLS on 1416614764

[scooby73466]

just buy the resin and all is told on the package but my opinion only, hilti is the best but for a one off job buy a much cheaper drill bit and look at spit resin etc

I'm hoping to be able to hire the drill and the drill bit.

[scooby73466]

we use 25mm drill for m20 threaded studs, old hoover is better compressor sprays dust in your face and the room (trust me i did it last week)

we use old hoover with bit of 22mm push fit pipe to suck them out and then once with the brush

for 19mm you want 22mm

with rebar doweling in existing concrete you can drill the same size then hammer in, love nor money or swearing will get them out

What Giles is saying about dust isnt for the dust that would fall out of the hole or that that would stay in the air, it's the dust that lines the hole once it is drilled; this needs to be removed so that the resin will stick to the wall as the dust would act as a bond break.

Thanks KLS and Giles. I'll get hold of a brush that fits the holes. Reckon the kitchen might be the first place to look for the brush. I'll wait until Mrs. Scooby is out though.

[seanandruby]

Nice to see you using the correct fixing technique Scooby.
It helps against sheer resistence. ''Bang them in with an hammer'' ??? Do it once do it right :;):

[scooby73466]

Nice to see you using the correct fixing technique Scooby.
It helps against sheer resistence. ''Bang them in with an hammer'' ??? Do it once do it right :;):

Thanks for that S&R. Never used this technique before, would normally have used Rawlbolts but I keep reading about this resin so thought I would give it a go.

EDIT. Sorry, got your username wrong so changed it.

[seanandruby]

It's come a long way since the days of molten lead poured around bars to stop corrosion and not long ago the glass phial mixture we used to have to drill in to mix it