spikey Posted January 16, 2023 Share Posted January 16, 2023 (edited) I wish to drill a hole of 16-18mm or so diameter through the stone wall of my humble abode, which is about 14" thick. I have an ordinary cordless hammer drill with a 12mm chuck, and I have masonry bits of 6 and 12mm which are long enough. My problem is how then to take the hole from 12mm to at least 16mm without incurring any unnecessary expense. I can probably access the 12mm hole from within and without the property in order to enlarge it from both ends with a standard-length masonry bit, but I can't find such a thing as a reduced-shank masonry bit to use with my drill. And I can't find a source of a suitable star drill chisel to do it the old-fashioned way. Anybody got any bright ideas? Edited January 16, 2023 by spikey typo Link to post Share on other sites More sharing options...
RMweb Premium kevinlms Posted January 16, 2023 RMweb Premium Share Posted January 16, 2023 This is the best way to do the job, with an SDS drill bit, but I suspect from your description that your drill isn't an SDS type. Can you borrow one, because you'll be amazed at how much better these SDS bits do compared to standard masonry bits. Note Australian Bunnings site. https://www.bunnings.com.au/ramset-masonry-drill-bit-sds-18-x-200mm-r3-ycut_p0171076 Link to post Share on other sites More sharing options...
RMweb Premium Dave John Posted January 16, 2023 RMweb Premium Share Posted January 16, 2023 Any use ? https://www.screwfix.com/p/erbauer-straight-shank-masonry-drill-bit-16-x-150mm/6040v Link to post Share on other sites More sharing options...
spikey Posted January 16, 2023 Author Share Posted January 16, 2023 Cheers Kevin but drill isn't SDS and I don't know anyone who could maybe lend me one. Looking at the chuck end of an SDS drill though, I'm wondering if it would fit in my non-SDS chuck ... Link to post Share on other sites More sharing options...
spikey Posted January 16, 2023 Author Share Posted January 16, 2023 20 minutes ago, Dave John said: Any use ? https://www.screwfix.com/p/erbauer-straight-shank-masonry-drill-bit-16-x-150mm/6040v It would be if I could get a 16mm shank drill in a 12mm chuck 🙂 Link to post Share on other sites More sharing options...
RMweb Premium kevinlms Posted January 16, 2023 RMweb Premium Share Posted January 16, 2023 16 minutes ago, spikey said: Cheers Kevin but drill isn't SDS and I don't know anyone who could maybe lend me one. Looking at the chuck end of an SDS drill though, I'm wondering if it would fit in my non-SDS chuck ... No chance. Close inspection will show that there are 4 notches of different sizes. These are there to prevent it rotating, but they will stop them fitting a standard chuck, as there is no circular surface, so it won't run true. Attempting it would risk breaking your wrist!!!! No electrician mate, as almost certainly they will have one? 1 Link to post Share on other sites More sharing options...
RMweb Premium Dave John Posted January 16, 2023 RMweb Premium Share Posted January 16, 2023 It is a reduced shank that fits a standard 13 mm chuck ? See pics 1 Link to post Share on other sites More sharing options...
RMweb Premium kevinlms Posted January 16, 2023 RMweb Premium Share Posted January 16, 2023 3 minutes ago, Dave John said: It is a reduced shank that fits a standard 13 mm chuck ? See pics The Q&A answer says it's tapered. It isn't it's stepped. 1 Link to post Share on other sites More sharing options...
kitpw Posted January 16, 2023 Share Posted January 16, 2023 https://www.ukdrills.com/masonry/profi-masonry/profi-masonry-drill-bit... these are reduced shank drill pieces to fit a regular 13mm chuck. Lengths available up to 600mm (at a price): the 16 x 200 or 16 x 300 would do for a 14" thick wall. 1 Link to post Share on other sites More sharing options...
spikey Posted January 16, 2023 Author Share Posted January 16, 2023 2 hours ago, kevinlms said: The Q&A answer says it's tapered. It isn't it's stepped. And the description says straight shank ... Link to post Share on other sites More sharing options...
spikey Posted January 16, 2023 Author Share Posted January 16, 2023 1 hour ago, kitpw said: https://www.ukdrills.com/masonry/profi-masonry/profi-masonry-drill-bit... these are reduced shank drill pieces to fit a regular 13mm chuck. Lengths available up to 600mm (at a price): the 16 x 200 or 16 x 300 would do for a 14" thick wall. Oh joy unbounded! Thank you, kind Sir. If only my Google-fu was a strong as yours ... Problem solved 🙂 Link to post Share on other sites More sharing options...
RMweb Gold Jonboy Posted January 16, 2023 RMweb Gold Share Posted January 16, 2023 Our local tool hire shop is £15 a day for an SDS drill. 1 Link to post Share on other sites More sharing options...
spikey Posted January 16, 2023 Author Share Posted January 16, 2023 52 minutes ago, Jonboy said: Our local tool hire shop is £15 a day for an SDS drill. Which is fine - if you can easily afford the £15, plus the cost of the appropriate drill bit ... Link to post Share on other sites More sharing options...
RMweb Gold chris p bacon Posted January 16, 2023 RMweb Gold Share Posted January 16, 2023 One of these will open up a 16mm hole. https://www.screwfix.com/p/dewalt-d25899k-gb-9-9kg-sds-max-electric-breaker-240v/51963 For a bit of making good after. https://www.screwfix.com/p/no-nonsense-interior-ready-mixed-filler-white-off-white-1kg/555gt 1 1 Link to post Share on other sites More sharing options...
RMweb Gold tomparryharry Posted January 16, 2023 RMweb Gold Share Posted January 16, 2023 I might suggest that next time you need to replace your drill, buy an SDS-equipped model, and add a standard 13mm chuck, with the SDS arbor. That way, you cover all of the bases. 1 1 Link to post Share on other sites More sharing options...
didcot Posted January 17, 2023 Share Posted January 17, 2023 If drilling through walls to the outside its a good idea to angle the hole so that it goes up slightly from the outside. It helps stop water running into the hole and your inner walls. SSE replaced our mains cable in our old house and drilled down from the outside. Being a solid brick wall the water ran along the cable and down behind the consumer unit. 3 Link to post Share on other sites More sharing options...
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