SDS+ drill bit for concrete around fence post

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My SDS Bosch drill is a professional (blue) one but doesn't have roto stop.
I want to replace a fence post and want to drill the concrete around it.

Last time I hired a breaker, but this time I've only got 2 posts to do, and it's not worth the money.

With no roto stop, it's a case of making lots of holes rather than being able to use a chisel bit.

Do the longer bits break or could I drill down 20cm or so at a time?
What bit would people use?
A 45cm bit seems frightening, 26 would be a smaller one.
 
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Its going to knock hell out of your drill, but thats your business...personaly I'd hire a breaker, but if your going to go your way, go for the smaller diameter drill.
John :)
 
Assuming it's timber, get an SDS auger bit and drill a few big holes down into the post instead, if you're lucky it's possible to remove the post (chisel, smack and lever it) leaving the concrete around it intact, which you can just slot new post into. You may need to shave the corners of the post off slightly and/or pack around the post. Not always possible but I've done it a few times.
 
Thanks.
I've ordered a big masonary bit anyway and will give both methods a go, probably before an emergency trip to HSS to hire what I used last time.
 
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why not just dig it out using the post if not snapped as a lever???
 
slam a pickaxe into the side of it at ground level and lever it out like using a claw hammer.

Not so easy with concrete posts. :LOL:
 
no you can paint those ones apparantly to look like trees to avoid having to remove them :LOL:
 
If you put at point chisel in the drill without rotostop it is the same effect as though you had rotostop.
 
Posts are snapped off at ground level.
It really depends on how huge the concrete blob turns out to be.
Some of ones on the other fence were massive.

If you put a point chisel in the drill without rotostop it is the same effect as though you had rotostop.
Funny, I was thinking about exactly that when I saw it in Screwfix/Toolstation:
Pointy chisel
 
They can chase out walls and do light work well but you will destroy your good drill by trying to bust a big lump of concrete with it.

I would try hitting it with a heavy sledge or borrow/ hire a breaker.
 

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