Precisely placed holes in morter

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  #1  
Old 06-23-04, 02:15 PM
pixels
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Precisely placed holes in morter

Drilling a precisely placed hole in mortar walls, especially walls made from concrete block, can cause a carbide drill to wander sideways, thus, ruining the placement. Does anybody have a solution to this problem? I was thinking of building a jig, which I could do, but there has to be an easier way. Come on, somebody out there must have a solution to this age old problem.
 
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Old 06-23-04, 06:25 PM
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Drill a smaller pilot hole, dont use wore out bits, dont force it or use a hammer drill. I like option 4 the best.
 
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Old 06-23-04, 08:11 PM
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pixels,

What tolerance are you trying to achieve?

Hellrazor has the right idea with first drilling a pilot hole and the use of a hammer drill.
Without a hammer drill it will be near impossible to achieve any accuracy.
Even then, you can hit a small stone that will deflect the bit.

I will use a 1/8" carbide bit which is easy to control and then increase to 3/16" and then 1/4". After 1/4" you can jump a couple of sizes to the one you need.
 
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Old 06-24-04, 12:32 PM
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It may help to build a guide jig from wood so that the drill bit will be less likely to wander. If you are installing an appliance, positoning the escuteon and drilling through the holes helps keep everything in perspective.

You could just drill a larger hole and grout the fastener in place.

Hope this helps.
 
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Old 06-24-04, 12:46 PM
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pixels,

What are you fastening to these walls anyhow?
 
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Old 06-24-04, 06:34 PM
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Oh and something i forgot, if you dont have access to a hammer drill. If you are drilling and hit something that doesn't seem to move, it might be a stone. In this case use an old awl and give it a good wack with a hammer. Make sure you are centered in the hole when you do this. Then you can start drilling again and it should work out ok.
 
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