drilling through concrete walls: how to?

Sep 04, 2009 32 Replies

Thanks. I thought I was saving myself some work by using one fitting instead of two but it backfired.

I have seen he above fitting before but where the pipe was fitted externally. I had not thought that I could use an elbow to rotate the pipe through the wall into the side of it. How clever!

Thanks.

Sorry, I forgot to ask, does such a thing exist as a non-90 degree elbow. I'm sure it doesn't but I thought I should ask. I've only ever seen 90 and 45 degree (or should that be 135) fittings.

rigid in my hands so this was an eye opener. BTW what do you use the

14Lb weight for normally?

Stretching his member?

Dave

I've got me coat.

If you are running a pipe vertically to the hole, you can put a slight bend in the end of it. So it tips the elbow dwn a bit and gives you the

87 degrees or whatever it is you need.

If you get a bit hot enough the weld will fail that holds the carbide edge. Did the bit change colour or start to get a blue sheen? If it did that would indicate overheating.

The Bosch ones I use regularly are their "multimaterial" bits which I find to be excellent - they in theory drill everything, but are excellent on masonry.

Its quite handy when you want to weight something down - say when assembling and gluing stuff. Or the other day I was jigsawing round the edge of a board, and the weight was quite handy for holding the board on the table while I worked on the edge overhanging the table.

(I did not actually buy it, but a mate was about to lob it in a skip while clearing out his garage, so I rescued it!)

That's a clever trick; I will remember that in case I need it in the future. I thought you were meaning a brass elbow that was 87 degrees!

No, it didn't overheat nor turn blue.

I have used those in a non-sds drill but I thought they only went up to about 13 or 14mm and in short lengths. I didn't know they did wide and long sizes too. This was just a "plain" Bosch sds bit.

They sound handy. I'll have to check local skips ;)

No, they don't do large versions of those that I am aware of. I was just mentioning it to say that some at least of the bosch bits are very good. Not tried their SDS ones.

Toolstation sell Bosch sds bits called "Bosch B8". They look as though they have a blue flute, as do the multipurpose bits but I don't know whether B8 is the Bosch code for multipurpose or whether it is something else all together.

I've got SDS bits from many sources - including market stalls - and they don't seem to vary by much. Unlike 'ordinary' masonry drills.

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