Fire brick problem. PLEASE HELP!!

[Nic Cox]

Re: Fire brick problem. PLEASE HELP!!

Thanks guys, your advice has worked! I am still finding it really hard to cut the bricks but after a couple of passes over a normal red brick the blade does sharpen up, but not enough to cut a full fire brick.

I have finished by oven floor now, and on Monday I shall start on the dome, this brings me to my next question; on most of the sites I've researched building my oven , people seem to cut their bricks in half to build the dome, is there a reason for this or can I use full size bricks??

[Laurentius]

Re: Fire brick problem. PLEASE HELP!!

Hi Nix,

Also retrieve those other blades they still have some cut in them!

[Nic Cox]

Re: Fire brick problem. PLEASE HELP!!

Thanks guys as soon as I get back from work I will give your advice a go and see if it works.

Thank you for responding so quickly, I was thinking that I was going to have to rent a masonry chop saw, so you may have saved me some money, I will let you know how I get on.

Thanks again!!!

[Tscarborough]

Re: Fire brick problem. PLEASE HELP!!

Correct. The diamonds are embedded into a matrix. To keep the blade "sharp" you have to wear away the matrix to expose the cutting points, i.e. diamonds. Some blades have a soft matrix, some have a hard matrix, but the way to "sharpen" either is cut the opposite hardness of the material the blade is designed for.

[cobblerdave]

Re: Fire brick problem. PLEASE HELP!!

G'day
Is a simple a case of the bricks being to soft to open up the new diamonds. Just cut into an old piece of concrete or rock and it will bare some new diamonds on the surface of the blade.
Regards Dave

[Nic Cox]

So ,I have started building my wood fired oven in the last few days, I am at the stage where I am cutting my fire bricks to make the floor of my oven.

I am using a 9" angle grinder with a diamond cutting blade to chop up my bricks (which are 64mm thick) the blades cost about ?25 each, and so far I cut between 5-7 bricks and the blade dulls and becomes too blunt to use!!!

At first I thought it was because I was trying to cut the curved lines of the outside wall of my oven and the blade isn't designed for this, so I brought a new blade and only did straight cuts, using a masonry file to give me a curve, but I am still only getting about 5-7 bricks in and the blade becomes blunt again!!!!!

I have about 120 bricks left to cut and at this rate I am going to spend a small fortune on blades. I must be doing something wrong, and advice would be greatly appreciated!!!!