Pocster Posted November 20, 2017 Share Posted November 20, 2017 Hey all got plenty of holes to drill through reinforced concrete wall and floor. any recommendations for the drill ? cheers Link to comment Share on other sites More sharing options...
PeterW Posted November 20, 2017 Share Posted November 20, 2017 one that doesn't break your wrist.... If you hire one, check the clutch torque has been set properly - how big are the holes you want to drill...??? Some are set to "break" with 150mm cores in them, so with a 50mm core it will try and take your arm with it as the clutch won't give with a smaller core... Link to comment Share on other sites More sharing options...
Alexphd1 Posted November 20, 2017 Share Posted November 20, 2017 (edited) We used a 127mm standard dry core drill with a makita 8406 drill in 150mm ICF concrete. We have the same kit as this http://www.britishbathroomcompany.co.uk/rothenberger-89020-roth-12pce-dry-diamond-core-drill-kit?gclid=Cj0KCQiAl8rQBRDrARIsAEW_To98Y6s2EJ_ndTutB7A6vVOsNbFB7PrJLB04YVPCS4kNQSL1__9Ys0QaAmFbEALw_wcB . If you have many holes may be worth looking at a wet system unfortunately I have no experience of these. Edited November 20, 2017 by Alexphd1 Link to comment Share on other sites More sharing options...
Pocster Posted November 21, 2017 Author Share Posted November 21, 2017 Thanks looking at largest hole being toilet waste pipe so maybe 6” that’s the worse one through 6” reinforced concrete others are easier :-) Link to comment Share on other sites More sharing options...
PeterW Posted November 21, 2017 Share Posted November 21, 2017 So that’s a 127mm core which I would really be doing very carefully with a big hired in hole drill. Anything up to 50mm you can do with decent cores on an SDS but above that you are into wrist breaking - or being thrown off a ladder by the torque ... 1 Link to comment Share on other sites More sharing options...
TerryE Posted November 21, 2017 Share Posted November 21, 2017 +1 to Peter's advice. Hiring the right tool doesn't cost that much. A lot less than dealing with a badly broken wrist. Link to comment Share on other sites More sharing options...
Alexphd1 Posted November 21, 2017 Share Posted November 21, 2017 Just put of curiosity what drill would you guys been hiring? Link to comment Share on other sites More sharing options...
PeterW Posted November 21, 2017 Share Posted November 21, 2017 Mine was a Hilti core drill with Ox cores. 110v and massive torque ..!!! Link to comment Share on other sites More sharing options...
Onoff Posted November 21, 2017 Share Posted November 21, 2017 I've been using eBay cheapies: Link to comment Share on other sites More sharing options...
Alexphd1 Posted November 21, 2017 Share Posted November 21, 2017 hilti dd130? Link to comment Share on other sites More sharing options...
Pocster Posted November 21, 2017 Author Share Posted November 21, 2017 These Hilton hire ones do they have a stand and you bolt the thing to the wall or floor ? I.e you don’t hold so no broken wrists !! Link to comment Share on other sites More sharing options...
Nickfromwales Posted November 21, 2017 Share Posted November 21, 2017 Any decent core ( diamond NOT Tct ) will have a clutch that any reasonably robust man can hold onto, I've used them all. Where depths are greater than the depth of the bit you need to go halfway in and then break the core out before carrying on. It's the dust / debris held between the core and the bit that cause it to snag. With a makita or dewalt dedicated diamond core drill I'll happily drill for a boiler flue up a ladder. Ask for a drill with an electronic clutch and you'll be fine. 50mm cores you can do in your sleep. Link to comment Share on other sites More sharing options...
Pocster Posted November 21, 2017 Author Share Posted November 21, 2017 (edited) 7 minutes ago, Nickfromwales said: Any decent core ( diamond NOT Tct ) will have a clutch that any reasonably robust man can hold onto, I've used them all. Where depths are greater than the depth of the bit you need to go halfway in and then break the core out before carrying on. It's the dust / debris held between the core and the bit that cause it to snag. With a makita or dewalt dedicated diamond core drill I'll happily drill for a boiler flue up a ladder. Ask for a drill with an electronic clutch and you'll be fine. 50mm cores you can do in your sleep. Hitting rebar is ok ?? Still rather buy one . I like new toys. Also no time pressure and can always sell on... Edited November 21, 2017 by pocster Link to comment Share on other sites More sharing options...
Bitpipe Posted November 21, 2017 Share Posted November 21, 2017 28 minutes ago, Nickfromwales said: Any decent core ( diamond NOT Tct ) will have a clutch that any reasonably robust man can hold onto, I've used them all. And so is born the 'reasonably robust man' test. 2 2 Link to comment Share on other sites More sharing options...
Alexphd1 Posted November 21, 2017 Share Posted November 21, 2017 We hit 1x 12mm rebar and it went through it fine. We then used a concrete grinding disc on a handheld grinder to square of the hole for the beam. We also cored a hole below dpm in concrete block, that was a nightmare due to block being damp? Link to comment Share on other sites More sharing options...
Pocster Posted November 21, 2017 Author Share Posted November 21, 2017 14 minutes ago, Alexphd1 said: We hit 1x 12mm rebar and it went through it fine. We then used a concrete grinding disc on a handheld grinder to square of the hole for the beam. We also cored a hole below dpm in concrete block, that was a nightmare due to block being damp? Cool ! Im man enough to break my wrist. home drill will do ! Link to comment Share on other sites More sharing options...
Nickfromwales Posted November 21, 2017 Share Posted November 21, 2017 1 hour ago, pocster said: Still rather buy one . I like new toys. Also no time pressure and can always sell on... Get £600 ready to lose ? Hire, hire, hire. Use, abuse return. Link to comment Share on other sites More sharing options...
PeterW Posted November 21, 2017 Share Posted November 21, 2017 1 hour ago, Nickfromwales said: Get £600 ready to lose ? Hire, hire, hire. Use, abuse return. Yep I second that ..!! Mine cost me £40 inc VAT including paying £15 for the 52mm core drill that I sheared two teeth off when it bounced off an exceptionally hard brick ..! I wouldn’t buy one, as putting it bluntly I wouldn’t buy a 2nd hand one as they need proper servicing ..! I watched them test the torque on the clutch before they handed it over to me, and if I was buying 2nd hand how do I know what abuse it’s had ..?? Link to comment Share on other sites More sharing options...
Onoff Posted November 21, 2017 Share Posted November 21, 2017 In my case with the TCT core cutter above if I hit steel then I have to change to a bfo Starrett cutter. Going to beg/steal it borrow a diamond one if I go for a single room MVHR. Link to comment Share on other sites More sharing options...
PeterW Posted November 21, 2017 Share Posted November 21, 2017 There’s a difference between drilling brick and block and drilling rebar reinforced concrete ... A cheap TCT will do one or two holes in brick and block, show it concrete and you will be there for days ... Link to comment Share on other sites More sharing options...
Onoff Posted November 21, 2017 Share Posted November 21, 2017 19 minutes ago, PeterW said: There’s a difference between drilling brick and block and drilling rebar reinforced concrete ... A cheap TCT will do one or two holes in brick and block, show it concrete and you will be there for days ... You're telling this to a man who drilled thru his footings with one for the new water main! Never thought it would end! Even with the home made extension bar: 1 2 Link to comment Share on other sites More sharing options...
Alexphd1 Posted November 21, 2017 Share Posted November 21, 2017 +1 for diamond never used a TCT (had to Google it??). Only material we stayed clear of was granite (Aberdeen grey granite) we needed a bolt on water cooled drill, nice bits of kit but expensive. We have the same makita dry core drill just over ten years but have never used the hammer function think we paid about £190 probably still worth £50 on eBay! Think they are about £250 now. Link to comment Share on other sites More sharing options...
Nickfromwales Posted November 22, 2017 Share Posted November 22, 2017 5 hours ago, Alexphd1 said: We hit 1x 12mm rebar and it went through it fine. We then used a concrete grinding disc on a handheld grinder to square of the hole for the beam. We also cored a hole below dpm in concrete block, that was a nightmare due to block being damp? Yup. I always kango them out after drilling a series of holes to reduce breakout. Damp brick / brickwork is a real pita when dry diamond core drilling . Link to comment Share on other sites More sharing options...
curlewhouse Posted November 26, 2017 Share Posted November 26, 2017 I've just got to go through 150/200mm of sandstone - I'm wondering now if I'll actually get away with some eBay cheapies instead of anything more expensive. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now