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Posted: Fri Nov 21, 2014 5:05 pm
by 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 !)
Posted: Fri Nov 21, 2014 6:53 pm
by 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
Posted: Fri Nov 21, 2014 8:08 pm
by 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.
Posted: Fri Nov 21, 2014 9:16 pm
by msh paving
i would suggest 22mm to allow resin to get around it, don't the resin manufacture tell you? MSH 
Posted: Fri Nov 21, 2014 9:46 pm
by 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
Posted: Fri Nov 21, 2014 10:17 pm
by scooby73466
msh paving wrote: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.
Posted: Fri Nov 21, 2014 10:21 pm
by scooby73466
GB_Groundworks wrote: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.
Posted: Fri Nov 21, 2014 10:22 pm
by scooby73466
Thanks to all for the help and advice so far.
Posted: Fri Nov 21, 2014 11:28 pm
by 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
Posted: Sat Nov 22, 2014 12:05 am
by KLS
scooby73466 wrote:GB_Groundworks wrote: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
Posted: Sat Nov 22, 2014 6:23 am
by scooby73466
rab1 wrote: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.
Posted: Sat Nov 22, 2014 6:38 am
by scooby73466
GB_Groundworks wrote: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
KLS wrote: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. 
Posted: Sat Nov 22, 2014 9:59 am
by 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 :;):
Posted: Sat Nov 22, 2014 10:33 am
by scooby73466
seanandruby wrote: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.
Posted: Sat Nov 22, 2014 10:53 am
by 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