Drilling through concrete and timber combination
Vortex
I need to drill an approx 300mm x 25mm hole through concrete that has a
50mm-ish block of timber embedded half way.
I don't particularly want to burn my way through the wood with expensive
masonry bits
I don't particularly want to destroy expensive wood bits with concrete.
Any suggestions?
Set Square
Vortex <ne...@nospam.vortex.fsnet.co.uk> wrote:
I've often seen demos (at Ideal Home shows etc.) of drills bits which
purport to drill through everything in sight - including steel, masonry,
wood etc. - but I have a natural suspicion of such demos, so I've never
bought any.
Has anyone else taken the plunge? Do they *really* do what they claim to do?
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Cheers,
Set Square
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Vortex
"Set Square" <d...@privacy.net> wrote in message
news:c5rkav$52hsn$1...@ID-217758.news.uni-berlin.de...
I actually need to drill 2 holes. This morning I took the plunge, intending
to start with an 8mm bit, then 12mm, then 18mm, then 25mm.
I succeeded in drilling one hole, in the process destroying one 8mm and 2
x12mm (20 quids worth) of bits.
Only when the hole was big enough to look into did I see the wood!
My drill (Bosch 550 watt) now smells like a burnt plastic bag as well.
Unless there is a "magic" drill bit available then methinks it's time to
invest in some SDS technology, and for the second hole I'll excavate a huge
hole (to reveal the wood), probably sacrifice a high speed wood bit (to get
through the wood) then masonry thereafter.
David.
Dave Plowman
Vortex <ne...@nospam.vortex.fsnet.co.uk> wrote:
> Unless there is a "magic" drill bit available then methinks it's time to
> invest in some SDS technology, and for the second hole I'll excavate a
> huge hole (to reveal the wood), probably sacrifice a high speed wood bit
> (to get through the wood) then masonry thereafter.
IMHO, if it's proper concrete, SDS is the only thing that will touch it.
If it's a 25mm hole you're after, drill the concrete with a masonry bit
till you hit the wood, then swap to a flat wood bit - they're cheap and
easy to re-sharpen. You can get extensions if it's not long enough.
--
*Dancing is a perpendicular expression of a horizontal desire *
Dave Plowman dave....@argonet.co.uk London SW 12
RIP Acorn
Toby
then small gap then second joist. The hammer action pushes it through the
timber with no impediment, have to be a bit careful about excessive breakout
on the far side of the timber.
--
Toby.
'One day son, all this will be finished'
Michael Mcneil
news:vMydnSHpCau...@pins.co.uk
> Unless there is a "magic" drill bit available then methinks it's time to
> invest in some SDS technology, and for the second hole I'll excavate a huge
> hole (to reveal the wood), probably sacrifice a high speed wood bit (to get
> through the wood) then masonry thereafter.
SDS drill bits will go through anything including the armor on wiring so
buy a detector with your drill.
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Posted via Mailgate.ORG Server - http://www.Mailgate.ORG
Dave Stanton
> SDS drill bits will go through anything including the armor on wiring so
> buy a detector with your drill.
Sounds like the voice of experience ! !
Dave
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Linux, breaking the pain of Windows
stuart noble
Dave Stanton wrote in message ...
>
>> SDS drill bits will go through anything including the armor on wiring so
>> buy a detector with your drill.
gold coloured thread. Very good through masonry and better than a masonry
bit through wood.
Michael Mcneil
news:heugc.941$lN....@newsfe2-gui.server.ntli.net
I've just come back from the local Sunday market. The sds dills on sale
there are a reincarnataion of Nu Tool/BlackSpur. I think the Chinese
gangsters who make these things must change the names of their stuff
every couple of years. If it isn't a tax dodge it must be warrantee
comebacks?
Boschman is the going phrase. They have picked on a German firm this
time and the prices reflect the German name for quality. 40 quid for the
drill 6 quid for a set of bits.