cutting concrete?

**isuzurover** · 25th June 2007, 02:10 PM

Who has done it themselves, what did you use and how easy/hard was it?

Need to cut the top off a 1200mm x 50mm wall concrete pipe..

**kaa45** · 25th June 2007, 02:15 PM

Is it standing up or laying down?
I've cut drive ways. You can hire a cutting machine pretty cheap, does the best job. Lot easier than abrasive disks in a saw or angle grinder

**5teve** · 25th June 2007, 02:28 PM

50mm wall could be done with a 9inch angle grinder... but a stihl saw (thats what we call them in the uk, diamond blade petrol cutter) would eat through it.. and you can hire them..

i have just used the stihl for cutting a bigger hole in a concrete slab..

Thanks

Steve

**isuzurover** · 25th June 2007, 02:28 PM

standing up (in the ground)

**4bee** · 25th June 2007, 02:45 PM

They are usually best if the blade is water cooled as well. Normaly has a hose fitting on the shroud. No dust, but also cools the diamond tipped cutting disc.

**isuzurover** · 25th June 2007, 02:51 PM

Coates hire want $100 for the saw and an extra $80 for the diamond blade!!!

I have a quote from a concrete cutting place for $190+GST for them to do it.

Looks like the only viable option is the angle grinder or the professionals.

**disco_thrasher** · 25th June 2007, 02:54 PM

the use of a concrete cutter [sthil] is a little dangerous using it above your hips unless you could drill guide runners which is over kill for this sought of job by getting a 9inch grinder with a diamand blade should easily do the job they can be hired ,using a proper concrete cutter[sthil] water needs to be used in the cutting process due to the high rpm,using the 9 inch grinder do not use water for obvious reasons electricity/water are not very good mates and you will come of 2nd best
just be aware of kick back from the grinder ,and use safety glasses /dust mask and always grind away from yourself
you can see i am a work place health and safety officer

a 2nd person my be needed if you are cutting a large amount off to steady piece so it does not fall on ya

**rrturboD** · 25th June 2007, 03:35 PM

I have tried a range of technologies cutting concrete, (as I have been renovating my precast concrete house!) If you have an 8" grinder, buy an 8" diamond blade designed for dry cutting . Makes an awful din, so wear earmuffs, and a industrial/garage vacuum does a pretty good job of the dust. The water cooled chainsaw based saws are the best, but very awkward to use on anything not horizontal.

**isuzurover** · 25th June 2007, 03:54 PM

Originally Posted by rrturboD

I have tried a range of technologies cutting concrete, (as I have been renovating my precast concrete house!) If you have an 8" grinder, buy an 8" diamond blade designed for dry cutting . Makes an awful din, so wear earmuffs, and a industrial/garage vacuum does a pretty good job of the dust. The water cooled chainsaw based saws are the best, but very awkward to use on anything not horizontal.

Thanks for the info (everyone else too!). Will check out the prices on blades. Anyone used a circular saw with a masonry/diamond blade?

Out of interest - what does a precast house look like - I have only ever seen workshops and office buildings made from it?

**discowhite** · 25th June 2007, 04:04 PM

isuzuroverCoates hire want $100 for the saw and an extra $80 for the diamond blade!!!

thank god i work for them! never costs me a cent

pitty your not in nsw

cheers phil

ps a ''demo saw and a diamond blade would be the best! but you can also use said demo saw and a masonary cutting disc(like a grinding disc) i dont like the idea of a 9'' the demo saw is way more stable.

cheers phil

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