Diamond disc vs. grinder

[Steevo]

Always used grinder discs here.

Could someone explain the do's and don'ts of each please?

 

[Bobthebuilder]

Don't use a grinding disc for cutting or a cutting disc for grinding

 

[Steevo]

Thanks! I worked that one out.

But.....why use a 1mm cutting disc when you could use a diamond disc?

 

[Lofty1984]

Diamond discs don't like cutting metal

 

[Steevo]

Diamond discs don't like cutting metal

Thanks.

What is best to cut a concrete post with reinforcing rods?

 

[Bobthebuilder]

A diamond disc would work well for that

 

[Lincs Lass]

Spectrum Blue diamond disc ,,I use them ,,designed for extreme materials ,
Or Marcrist

 

[bobk]

You need to use a diamond blade a fair bit to justify the cost , a stone cutting disc will handle that for pennies . albeit slower .

 

[Badshot]

I got a free diamond disc with both my grinders, they cut concrete posts like butter. Bloody incredible things, I remember trying to cut stone with normal discs and you may as well have a spoon in comparison.

 

[Lofty1984]

Thanks.

What is best to cut a concrete post with reinforcing rods?

They are OK for that as the metal is tight held in the concrete what I meant is they don't like cutting a piece of metal in the vice say, there's just no comparison between a stone cutting disc and a diamond as said it will cut like a hot knife through butter

 

[tomlad]

I know a builder mate would cut through a girder with his diamond in stihl saw
10/6 sort of size. ?
Is that okay

 

[roscoe erf]

I know a builder mate would cut through a girder with his diamond in stihl saw
10/6 sort of size. ?
Is that okay

if its for metal as in a metal cutting disc got one in my cut off saw but the concrete diamond cutting discs generate too much heat cutting just metal and warp

 

[madmatt]

Spectrum do a multipurpose diamond blade that the back of packet it does state you can cut steel RSJ i hqve seen them in the builders merchants i havent tried yet though.

 

[Steevo]

Thanks for the advice. Popped into screwfix today and picked one up for £12 - seemed good value to me.

Jewsons had a universal one they were selling the budget model for £30 and the top of the range model for £40.

 

[Shovelhands]

We use ADP Diamex diamond blades, find them very good. I would never consider using an abrasive concrete cutting disk again, as cheap as they are, there is, as has been said, just no comparison in efficiency. Also the diamond wheel pretty much retains it diameter through its entire life, only loosing a few MM, whereas the abrasive wheels are getting smaller all the time, useless if cutting big blocks, kerbs, walls ect, and no good if your trying to cut a hole through a floor, they just don't have the constant depth.

Have used them for metal, not as a rule but when needed, used to use Spectrum, they were OK for steel as they had a continuous rim, not segments, always check what the blade is designed for, the wrong job can ruin a very good quality blade, but use that blade for its intended use and it will be like a hot knife! Definitely always best to have the right one for the job in hand all rounders are ok but you can't beat getting the specific one for the job. But possibly hard to justify if not using them much?

 

[Steevo]

Do they make diamond discs specially for metal then?

 

[Lofty1984]

Spot on get the right blade for the job I've seen diamond blades fecked within a day of use cutting Tarmac it was not designed for it only concrete so it's important to check the label, also try not to cut for too long continuously the need to cool a bit you will just chew away the diamond edge if they get too hot

 

[TripleSix]

I used to sell Spectrum diamond tools - it's good stuff, generally if something comes back broken it's pilot error.

Found a diamond disc in a Stihl saw is excellent for cutting plastic pig slats

I run a £10 universal diamond disc in my petrol saw now, it's a fairly good make, had it years, hardly looks worn!