On Tuesday, 30 June 2020 08:47:25 UTC+1, The Natural Philosopher wrote:
> On 29/06/2020 14:31,
amoh...@gmail.com wrote:
> > Thank you for all the comments. Looks like I will patch until the
> > tree is gone. Then I will attack the postcrete from outside the
> > blob. When it come time to do this, I will still hire a large breaker
> > than buy a small one though. I cannot imagine a 4kg sds hammer drill
> > having the same destructive efficiency as a 20kg machine. A bit like
> > a big sledge hammer v.s. a small one. A small one will do the job,
> > but eventually. Whilst (I am hoping) a 20kg machine will be just
> > that bit faster.
> >
> I remember once having ruined a slab of sandstone, and taken nearly two
> hours to cut another one with a diamond tile cutter, the time taken to
> go into the town, hire a serious industrial angle grinder with a
> diamond blade, get back, cut the stones and return the grinder ("Was
> there something wrong with it mate?) was less than an hour...
>
> ...on the other hand after spending more on hiring a tile cutter than
> one cost, I bought one...
>
> Cost benefit analysis rules, OK?
Indeed. I'd not expect a standard SDS & drill bit to have any particular difficulty breaking up a concrete post though, so I'd get the SDS.