Thread: cutting concrete?

Hi,
Having experience using both demo saws and 9inch grinders with diamond blades, I would use the grinder with diamond blade. Demo saws are hard enough to control safely even when cutting into concrete floor slabs let alone horizontial and off the ground.

I also took it to be a 1200mm dia pipe, 50mm thick. If this is the case, I would mark the line to be cut, grind through the perimter, being careful to leave four, 100mm sections to support the offcut, spaced evenly. Then securely pack out and support the cut sections either side of the remaining sections to be cut. Then go back and cut out those remaining sections away. You may need to prop the offcut in place, if it looks like it might shift while cutting away the remaining sections. This is assuming the offcut is large etc...

Alternatively, if the piece to be cut away is relatively small, mark the perimiter, grind down to that line, vertically in many places, to allow for small, easily handled pieces. Then go around and cut away the perimiter and just let the pieces fall in the pipe or on the ground.

Thats how I read the problem and I hope this may offer a solution.

cheers Ben

discowhite this is on page 12and 13 http://www.deir.qld.gov.au/pdf/whs/c..._guide2001.pdf


During cutting, ensure that:
the blade guard is in the lowered position
when starting the machine, the operator and other people stand outside the
path of the blade if the machine stalls, the blade is raised and the outside flange and nut are checked for tightness
wall cuts are performed with the operator’s back close to vertical and the hands
do not move above shoulder height
where possible, cut from a standing position with the feet braced and the body
balanced. (In some circumstances, it may be necessary to kneel on one knee to
enable cuts to be made close to the floor. In such circumstances, protection for
the knee will be necessary.)
when cutting horizontally across a wall, the operator’s hand are at waist heightthe length of time the operator spends in a fixed positions is minimised

I'm no expert in this stuff but from my experience with angle grinders, I certainly wouldn't be cutting much higher than waist height with horizontal cuts.

There is no way I'd work at chest or head height (or above). I doubt one would be able to control the tool.

Ron

Originally Posted by p38arover

I'm no expert in this stuff but from my experience with angle grinders, I certainly wouldn't be cutting much higher than waist height with horizontal cuts.

There is no way I'd work at chest or head height (or above). I doubt one would be able to control the tool.

Ron

yes correct ,but angle grinder is alot safer than using a huge demo saw which weighs about 20kg and has huge amount of output on a horizontal cut
a vertical cut legally you can cut up to shoulder height but is still dangerous
which what i have been trying to say

Originally Posted by disco_thrasher

yes correct ,but angle grinder is alot safer than using a huge demo saw which weighs about 20kg and has huge amount of output on a horizontal cut
a vertical cut legally you can cut up to shoulder height but is still dangerous
which what i have been trying to say

legally ???? from what i have red and this is coming from a complete novice and i enterprate it this way it looks to me that what you have writen above looks more advisory, on a safe way to handle the equipment so as not to hurt or fatigue say for example the back......i.e to minimis the time spent in a fixed position.

no where does it say YOU MUST NOT which would be the words i would expect to see if that sort of cut is illegal and the out come is possibly fatal

but hey what do i know 20kg i probably couldn't even lift it above my knees bent of course mr safety officer

Originally Posted by dullbird

legally ???? from what i have red and this is coming from a complete novice and i enterprate it this way it looks to me that what you have writen above looks more advisory, on a safe way to handle the equipment so as not to hurt or fatigue say for example the back......i.e to minimis the time spent in a fixed position.

no where does it say YOU MUST NOT which would be the words i would expect to see if that sort of cut is illegal and the out come is possibly fatal

but hey what do i know 20kg i probably couldn't even lift it above my knees bent of course mr safety officer

gee more intelligance,,, mr safety officer[/QUOTE] ...i am the last person to talk about safety do what ever you want to your vechiles ect..but when it comes down to using high powered saw yes i will step in to voice my knowledge .if you don't like it don't read it or take it on its up to you
if it is advised on a qld work place health and safety site ,it means it is the best way to operate it safely when cutting horizontally across a wall, the operator’s hand are at waist height and yes it does sound like you don't know much on the topic mrs dullbird

Originally Posted by disco_thrasher

gee more intelligance,,, mr safety officer

...i am the last person to talk about safety but when it comes down to using high powered saw yes i will step in to voice my knowledge .if you don't like it don't read it or take it on its up to you

[/quote]





i only wrote that as that is the way i enterprited it i never said i was an expert and i never said i didn't like what you wrote mearly trying to understand..........so back off and get off your high horse safety or not.

you cant take a joke then maybe you shouldn't read it

Originally Posted by dullbird

legally ???? from what i have red and this is coming from a complete novice and i enterprate it this way it looks to me that what you have writen above looks more advisory, on a safe way to handle the equipment so as not to hurt or fatigue say for example the back......i.e to minimis the time spent in a fixed position.

no where does it say YOU MUST NOT which would be the words i would expect to see if that sort of cut is illegal and the out come is possibly fatal

but hey what do i know 20kg i probably couldn't even lift it above my knees bent of course mr safety officer

actually the WHS act in QLD doesn't state things as clearly as that, neither do the Advisory Standards, instead of saying "You must not" it says "You shall" meaning you must, to be compliant with the act.If it says "You may" that means the minimum level that you can apply to remain compliant.