Diamond Grinding Concrete Foot

[biljohns]

What is the best way to diamond grind the foot of the concrete floor in a garage (the concrete that sits under the wall). I have both an oscillating tool and a 4.5 angle grinder. The diamond angle grinder cuts through concrete like butter and the diamond oscillating tool (while very neat and precise), will take me forever to go around the foot of the garage. If I try to use the angle grinder around the whole foot, the concrete will look very inconsistent. Any tool or method recommendations?

The first picture is my efforts with the oscillating tool.
The second picture is what I am having to grind down.

 

[the gypsy]

You can use your regular grinder but have someone there with a vacuum cleaner to **** up the dust and don't forget face masks or glasses or both and respirators. You can use a wet grinder with diamond wheels. You can either buy a dedicated wet grinder or rent one, it is a grinder with a hose to bring water to the grinding wheel in order to keep the dust to a minimum or non existent.
I have used a regular 5 in. grinder with a stone on a horizontal surface with a water hose and a small stream of water, it is a little messy but working outside did not cause a problem. Please remember if you use a regular grinder plug it into a GFCI outlet . Vertical surfaces will get splashed if you use a regular grinder with water, unless you have an adequate shroud/guard on the grinder.

 

[LegacyIndustrial]

That is a tough one. I would try to do with the small angle grinder and be careful.
If you are doing a full rejection floor, the marks will largely be covered by the flake.
A glossy partial flake or no-flake floor will show some marks.

The diamabrush hand tool does not create kiss marks like a diamond cup.

also...You could literally skim-coat with bondo afterwards. Epoxy will stick to sanded bondo.

 

[Dhagan887]

Why not skim coat?

Dremel also makes a wheel for their (forget the name) mini circular saw tools that cuts somewhere in between the two and might work really well

 

[SunsetsAndFriends]

I have done what you are wanting to do. To accomplish this, I used the Bosch CSG15 5-Inch Concrete Surfacing Grinder. It worked great with built in dust collection. But keep in mind that this kind of grinding requires some finesse. There is a learning curve. It takes time. It's dusty even with dust collection. It's hard work. Use knee pads and a respirator.

 

[Armorpoxy]

We see most people try to carefully use a 4 in hand grinder. If this is causing problems, then skim coating/patch with a cementious type product to cover it would be suggested.