ToughButterCup Posted July 28, 2016 Share Posted July 28, 2016 Following on from this post , and to prevent the Post Office suing us, I've been doing some experiments on mending the sandstone door post; and this is what I found. I decided on an experiment to see how I could glue one piece of sandstone to another. Using one of the many sandstone boulders lying around our garden (£5:00 each to anyone who'll come and take them away) .... I split one of the boulders straight down the middle. Easy. I drilled a hole straight through both halves of the stone and inserted a 12mm threaded rod to act as a pin. I glued (well, resin bonded) the threaded rod into place. And slid the two halves together In a couple of the boulders in the trial holes I drilled, the sandstone split. I don't want to repeat that experience when I do it for real on the doorpost. To make the holes, I used a cheap generic 14mm drill bit and a hand-held Bosch drill. How can I reduce the chance of splitting the sandstone on the doorpost? As I see it, I have a good chance of making the problem worse - splitting even more of the sandstone out of the doorpost. Link to comment Share on other sites More sharing options...
DavidFrancis Posted July 28, 2016 Share Posted July 28, 2016 It's not an area I have much experience in, but what about starting with a 6mm bit, then expand the hole with a 10mm, and finish off with the 14mm? Link to comment Share on other sites More sharing options...
Barney12 Posted July 28, 2016 Share Posted July 28, 2016 (edited) In short; smaller holes. You don't need 14mm. The rod(s) are just to provide bonding strength and (in this situation) are not doing anything structural. You'll easily get away with 5mm, probably perfectly fine with 3mm rods. Drill your holes slowly with a simple arrow head tile bit. Or get fancy and use a diamond core drill. EDIT: No hammer action! EDIT (2): Rods must be stainless. Threaded is good as extra surface area for bonding. Edited July 28, 2016 by Barney12 EDIT: No hammer action! Link to comment Share on other sites More sharing options...
Barney12 Posted July 28, 2016 Share Posted July 28, 2016 17 minutes ago, recoveringacademic said: Using one of the many sandstone boulders lying around our garden (£5:00 each to anyone who'll come and take them away) .... If you keep drilling them in half then eventually you wont have boulders. Just small stones. Simples! Link to comment Share on other sites More sharing options...
ToughButterCup Posted July 28, 2016 Author Share Posted July 28, 2016 BINGO. If you want to know why I keep coming back to buildhub this thread is it. Link to comment Share on other sites More sharing options...
ToughButterCup Posted July 28, 2016 Author Share Posted July 28, 2016 5 minutes ago, Barney12 said: Or get fancy and use a diamond core drill. Oh dear, another excuse to buy tools Link to comment Share on other sites More sharing options...
Barney12 Posted July 28, 2016 Share Posted July 28, 2016 Just now, recoveringacademic said: Oh dear, another excuse to buy tools Absolutely. I have assumed in the arrow head bit scenario that the sandstone is fairly soft. But, if not you absolutely must go and buy some diamond core drills. Link to comment Share on other sites More sharing options...
Construction Channel Posted July 28, 2016 Share Posted July 28, 2016 Your all mad. A standard masonry bit. Not on hammer will be fine. Ct1 and some duct tape. Job done. Link to comment Share on other sites More sharing options...
ToughButterCup Posted July 28, 2016 Author Share Posted July 28, 2016 1 hour ago, Construction Channel said: Your all mad. A standard masonry bit. Not on hammer will be fine. Ct1 and some duct tape. Job done. It helps to be mad here, though. 2 Link to comment Share on other sites More sharing options...
Barney12 Posted July 28, 2016 Share Posted July 28, 2016 2 hours ago, Construction Channel said: Your all mad. A standard masonry bit. Not on hammer will be fine. Ct1 and some duct tape. Job done. You forgot the WD40, in case the bit gets stuck? 2 Link to comment Share on other sites More sharing options...
Construction Channel Posted July 28, 2016 Share Posted July 28, 2016 you will also need one of these Link to comment Share on other sites More sharing options...
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