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Old 04-13-2010, 09:35 PM   #1
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method for precision hammerdrilling?


I was just wondering if anyone had some tips on drilling precise holes into concrete. I mark dead centre where i need to drill but the drill bit doesnt seem to stay on my point.

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Old 04-13-2010, 11:04 PM   #2
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method for precision hammerdrilling?


The problem with concrete drilling is that the bit is often not too sharp, so it wanders. Start with a new, carbide tipped bit, use a hammer drill, and use a center punch to start a small hole. Should work better. But don't expect perfection, unfortunately the bit will walk a bit, especially if you hit a hard piece of stone in the concrete.

For real precision work, use a 38 ramset or a 22 ramset to install pins.

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Old 04-13-2010, 11:15 PM   #3
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method for precision hammerdrilling?


its a 7/16 inch hole for a 3/8 inch drop in anchor in a concrete housekeeping pad. the fixture has for holes in it. 3 lined up nice but the fourth needed to be reamed out with a step bit to allow the bolt to line up. doesn't look very nice. I will try making a pilot hole of sorts using the punch. used to hold a 112.5 kva transformer so using ramset wont work.

Last edited by thefatpigeon; 04-13-2010 at 11:18 PM. Reason: extra info
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Old 04-13-2010, 11:37 PM   #4
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method for precision hammerdrilling?


If I wanted a precision located hole drilled in concrete, I would first drill a smaller hole in a piece of 1/4 metal and secure it to the concrete by standing on it. Use this as a pilot guide.
I have done this many times and if I want to be "dead on" I drill the desired finish hole in the metal and finish drilling.
Securing to prevent movement is sometimes the problem.
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Old 04-13-2010, 11:55 PM   #5
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method for precision hammerdrilling?


Thanks for the hole in a plate tip
sounds good
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Old 04-14-2010, 06:54 PM   #6
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method for precision hammerdrilling?


ya i was thinking on making a template too since i have 7 more to install.

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