I have to a (SDS) drill 16mm hole in some brickwork for a rawlbolt. Is it best to drill a pilot first? I think probably not, as presumably SDS is designed to start with it's own leading edge (?)
Pilot hole needed?
Aug 16, 2006
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Depends on how accurate it needs to be - a hammer type action tends to overbore a bit epecially at first. Mostly no one cares, as most of the strength is from the deeper part of the hole.
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Depends on how accurate it needs to be - a hammer type action tends to overbore a bit epecially at first.
Mostly no one cares, as most of the strength is from the deeper part of the hole.
Can't do any harm to start with a 5mm bit. I usually use a non hammer drill for any kind of precision. My SDS bounces about a bit too much
I don't bother. I do start with hammer switched off for accuracy, though.
Christian.
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