SDS Hammer Drill: how hard to push? I'm breaking up concrete, push very hard, quite hard, or not at all?
[george]- posted
5 years ago
SDS Hammer Drill: how hard to push? I'm breaking up concrete, push very hard, quite hard, or not at all?
[george]
Drill, or chisel?
If it is a heavy device then as far as possible use the weight of the device. If it's just a small one then you may have to push quite hard to get anywhere.
There is quite a "knack" to breaking concrete efficiently. Try to start from an edge, if you can't then try to make an initial crack in the middle (e.g. with a sledge hammer). Assuming it is something like a path laid on earth, get a crowbar under it and try to lift it.
ten inches of concrete over a sewer pipe
For drilling, usually only hard enough that you can feel the bit/chisel "floating" on the air cushion. For chisel for, a bit harder, but not much.
That's hard and fast.
There is no need to be sensitive.
George Miles explained on 30/03/2019 :
Let the weight of the machine do the work - You should not need to push, you just need to steady it and let it bounce. If it stops bouncing, or the bounce seems restricted - you are pushing too hard.
If you start going up and down on the end of the drill you might not be pressing hard enough? Brian
That's quite a lot thicker than I've ever had to break up. What sort of SDS drill do you have? How many joules? Is it a breaker, or just a standard drill?
As far as the drill bit is concerned, you may find it easier to use a spike than a chisel, and just crack chunks off the edge.
Order a couple of spare lengths of salt-glazed pipe now ;-)
If it just domestic stuff, no more than 4-5 inches thick, then use a spade to undermine the edge about a foot or so in, then just give it a whack with a decent sledge hammer. It should just crack and create a calve just like an iceberg.
then just undermine a bit further and repeat.
Unless you have a heavy duty SDS machine intended for concrete breaking you'll be at it for ages.
In that case hire a 9 or 12 inch angle grinder and try and chop lumps out of it. The sledge hammer technique that I mentioned lower down is probably not a good idea :-(
And get the correct diameter and matching plastic connectors.
There used to be two companies, Naylor and Denley ?, whose products were not quite compatible.
If we are talking a 2kg class machine with 2-3J of impact energy, then you are in for a very *long* job. It was a similar job some years ago that prompted me to buy a 15kg machine with 45J of impact energy!
Cutting slots with a diamond disk in a large grinder, may may it a bit quicker to attack, since you then only need the SDS to break out the waste bit between the slots.
For 10" concrete, you are going to need a much bigger angle grinder than that, surely?
+1
I would be starting out by cutting deep slots in a three inch grid with a big angle grinder, then knocking out the individual blocks. That is a
*very* substantial bit of concrete to tackle with anything less than a full sized breaker. And a breaker on a JCB would be better.
Whatever works quickest ;-)
:-) Yup!
And guarantee the sewer pipe underneath gets broken?
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