Temp Posted July 23, 2016 Share Posted July 23, 2016 (edited) Turns out some new walls lights I have are tapered and I will have to enlarge existing the holes in the brick wall to get them in. Currently the holes are about 70mm diameter and need to be about 1 or 2mm larger over half their depth. Looking for suggestions on the best way to do this. I have eight to do. Screwfix have a 78mm core drill and suppose I could make a wooden plug with a 10mm hole in the middle to guide it. Would probably jam a lot. Any other suggestions? I can't get the light fittings turned down because I don't think the wall thickness of the fitting is sufficient. Edited July 23, 2016 by Temp Link to comment Share on other sites More sharing options...
Nickfromwales Posted July 23, 2016 Share Posted July 23, 2016 How deep do you need to ream them? Link to comment Share on other sites More sharing options...
Temp Posted July 23, 2016 Author Share Posted July 23, 2016 Probably only the outer 50-60mm or so needs to be enlarged. Link to comment Share on other sites More sharing options...
Temp Posted July 23, 2016 Author Share Posted July 23, 2016 I'm wondering if an internal grinding wheel might work? Link to comment Share on other sites More sharing options...
Nickfromwales Posted July 23, 2016 Share Posted July 23, 2016 Can you get hold of a smaller diamond core drill ( beg / borrow ) and use it side on to ream the hole accordingly. ? Link to comment Share on other sites More sharing options...
Temp Posted July 23, 2016 Author Share Posted July 23, 2016 Yes looks like some experimenting needed. Link to comment Share on other sites More sharing options...
Nickfromwales Posted July 23, 2016 Share Posted July 23, 2016 May the sideways force be with you. Link to comment Share on other sites More sharing options...
Frogeye Posted July 23, 2016 Share Posted July 23, 2016 You could do with a diamond grinding drum like this: http://www.dk-holdings.co.uk/stone/vacuum.html I'll have a dig around in the morning and see if I still have one laying around for you to borrow! Link to comment Share on other sites More sharing options...
Temp Posted July 23, 2016 Author Share Posted July 23, 2016 Thanks! While I was googling for possible ideas I came across this site with what looks like very low prices on TCT core drills. Perhaps too low? https://www.beal.org.uk/stock-clearance/core-shells.html 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted July 24, 2016 Share Posted July 24, 2016 TCT may damage the face before cutting in. I'd only consider diamond for this job tbh. Link to comment Share on other sites More sharing options...
Temp Posted July 24, 2016 Author Share Posted July 24, 2016 Frogeye - Thanks for the offer but I've now discovered several of the holes aren't deep enough either so I've invested in a core drill bit. Link to comment Share on other sites More sharing options...
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