Concrete grinding options

[Filip]

I ned to grind down some concrete high spots to get a better level before I tile, mainly a sand and cement mix without any pebbles. What is the best attachment to use with my 115mm angle grinder. My research on here leads me to a Silicon carbide product, would this be any use --here as I already have the backing pad. I also have a bosch Pex 125 sander with velcro pad I can use, or do I go for a diamond disc/pad.

 

[Flintstone]

Have you got some dust extraction that is the question?

 

[LM]

I ned to grind down some concrete high spots to get a better level before I tile, mainly a sand and cement mix without any pebbles. What is the best attachment to use with my 115mm angle grinder. My research on here leads me to a Silicon carbide product, would this be any use --here as I already have the backing pad. I also have a bosch Pex 125 sander with velcro pad I can use, or do I go for a diamond disc/pad.

Silicon carbide products are a waste of time for this type of task, get something like below. But as already stated dust extraction is paramount this will. E a big health risk.

 

[Filip]

Silicon carbide products are a waste of time for this type of task, get something like below. But as already stated dust extraction is paramount this will. E a big health risk.

There was nothing below - what were you linking to ?.
The area is outside and I was planing on attaching a heavy duty vacuum cleaner either with a shroud - home made or positioning the vacume end near the flow of dust

 

[LM]

One of these would be better, I got there eventually

 

[Flintstone]

That will certainly do it, but there’s no holding the vac near by, you need to get a propper cowl and suitable vac

 

[WetSaw]

It is outside so he could just wait for a windy day!

 

[Flintstone]

Even better a rainy windy day

 

[Italy]

It is outside so he could just wait for a windy day!

Even better a rainy windy day

and maintain good neighborly relations ...

 

[Filip]

Thanks chaps.The concrete area is normal mix with stones that was here when we brought but was a rough mess so I top dressed it with a sand and cement mix so do I actually need such an aggressive tool? That screwfix one unfortunately will not fit as it is a 125mm and my grinder is 115mm.
Can anyone recommend an under £15 one 115mm, I have just been looking and found some as low as £8 on ebay.
Is there anything similar that I could use on my 125mm orbital sander.
The problem with angle grinder is it only has one speed which throws out all the dust but the bosh sander I can control at a lower speed.

 

[LM]

You may be better simply hiring all you need for the day, vacuum included.

 

[Filip]

Thanks but I have a vac for the job and I may only need the the pad for 1 hour and then I do not mind it sitting in my tool box for a few years before I need it again. Equally I do not mind a very cheap one that will only last the one job.
What I am worried about is a very cheap one disintegrating itself rather than the concrete..

 

[Old Mod]

Not even a Cheap grinding cup will be weaker than the concrete, they’re very aggressive.
Should really be used with a variable speed grinder with high torque, something like a flex.
A lot of 125 discs will fit inside a 115 cowl.
I put 125 discs on my 115 grinder quite frequently.
There’s no real shortcuts unless you try going at it with an SDS drill with a scutching comb.

 

[Filip]

I never knew you could get variable speed ones but its a long time since I brought one you mean like this Like this one
or are there trigger sensitive ones.

 

[Old Mod]

I never knew you could get variable speed ones but its a long time since I brought one you mean like this Like this one
or are there trigger sensitive ones.

Yes like that one, however, that is NOT variable speed

This fits a 115 standard grinder.

Grinding cup