Pocster Posted October 15, 2018 Share Posted October 15, 2018 Looking at d21570k dewalt Assume this is clutched ; so I don’t break my wrist ? I know I could hire but I am bound to use it more than I think - so can sell on afterwards . This a good drill for core drilling concrete ( vents / pipes - so 100mm + ) Also any recommendations for the actual diamond core bits ? . Don’t want top of the range ; just reasonably priced . cheers Link to comment Share on other sites More sharing options...
PeterW Posted October 15, 2018 Share Posted October 15, 2018 I wouldn’t use that with a 115mm core as it will probably mince its own gearbox and it’s not worth the hassle. There is a reasonable Marcrist core set in Screwfix at a reasonable price. It would save you the cost of the hire/wear on the bits although unless you’re doing lots and lots of cores, you will barely mark a hired core (assuming you can get one with an SDS chuck) If you are planning on coring through reinforced concrete then I would seriously consider hiring a framed core drill as it will be the rebar that snags the core and not the concrete. A frame will take the snatch load and stop it hitting you in the face or worse - likewise, never try and core drill from a set of steps as it will throw you off. As a comparison, I’ve cored 4 x 115mm, 4 x 48mm and a couple of 65mm cores through heavy block and reclaimed engineering bricks and did the lot in less than a day with a hired unit. Cost me about £40 inc the core drills. To buy a decent unit and cores you are north of £350 so are you really saying you need one for more than 5 days as you’ll only get 50% back for it. Link to comment Share on other sites More sharing options...
Pocster Posted October 15, 2018 Author Share Posted October 15, 2018 Thanks No reinforced concrete to go through . Problem is I’m bound to forget / need to relocate a previous hole ( accept my planning limitations ? ) That dewalt really no good ?? Link to comment Share on other sites More sharing options...
Alexphd1 Posted October 15, 2018 Share Posted October 15, 2018 (edited) Can't give you a exact answer on dewalt but its probably be fine. We have a Makita 8406 and done hundreds of boiler flue holes over the years. The makita looks very similar spec but 3 times the price. Could always buy it from a shop with a good return policy? I have seen a lot of ex hire core drills on bidspotter recently going for peanuts. Just checked bidspotter and seems to be none left. Only time we use a jig set up is for granite and it's more for the wet cut. Check what size of cores you need before buying a kit, we have a box with 6 or 7 sizes and tend to use the same 2. I have bought v cheap and mid priced "branded" dry core bits and to be honest they are all the same. Edited October 15, 2018 by Alexphd1 1 Link to comment Share on other sites More sharing options...
Russell griffiths Posted October 15, 2018 Share Posted October 15, 2018 I have a very nice expensive makita and it is useless with my 110mm core bit the clutch cuts in far too often, instead I have a £45 mini breaker with sds chuck from somewhere like Aldi that I use all the time, I just go steady and make sure my finger is ready to let go. ?? Link to comment Share on other sites More sharing options...
Alexphd1 Posted October 15, 2018 Share Posted October 15, 2018 Just checked the makita 8406 is just over £200 new on fleebay. Cracking machine for the job. The hammer function ain't great on it though. Link to comment Share on other sites More sharing options...
nod Posted October 15, 2018 Share Posted October 15, 2018 45 minutes ago, pocster said: Thanks No reinforced concrete to go through . Problem is I’m bound to forget / need to relocate a previous hole ( accept my planning limitations ? ) That dewalt really no good ?? I wouldn’t bother with the Dewalt Most hire shops use the makita Compact But bullet proof The framed type are usually Hillti or Milwaukee 1 Link to comment Share on other sites More sharing options...
Cpd Posted October 15, 2018 Share Posted October 15, 2018 I used a petrol core drill for years, drilled uncountable 25mm and 60mm holes and hundreds of 110mm holes into bedrock it looked a bit like this but was red.... eventually it chewed up the main drive cog / Shaft and I am yet to find a replacement. It was brutal as it had no clutch, but you just hugged it a tight as fek and got on with it....... 1 Link to comment Share on other sites More sharing options...
Alexphd1 Posted October 15, 2018 Share Posted October 15, 2018 (edited) 24 minutes ago, Cpd said: I used a petrol core drill for years, drilled uncountable 25mm and 60mm holes and hundreds of 110mm holes into bedrock it looked a bit like this but was red.... eventually it chewed up the main drive cog / Shaft and I am yet to find a replacement. It was brutal as it had no clutch, but you just hugged it a tight as fek and got on with it....... I could just see the housewife/house husbands face when I start that bad boy up in the middle of their 50k kitchen to core out a small waste hole?? that is some piece of kit! Edited October 15, 2018 by Alexphd1 1 Link to comment Share on other sites More sharing options...
PeterW Posted October 15, 2018 Share Posted October 15, 2018 That looks like a post hole borer with a core drill welded to it ..!! I sooooo want one ...!!!!! Link to comment Share on other sites More sharing options...
Onoff Posted October 15, 2018 Share Posted October 15, 2018 Cheap seats here: Link to comment Share on other sites More sharing options...
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