Starting to grind floor, help!!!

[ddewey78]

OK, so I started to grind the floor with a 7 in diamabrush, but before I go any further, want to make sure I'm doing the right thing. Seems as though it's leaving way too deep of swirl marks.

Can't seem to load pictures from my phone, I'll upload some when I get to my computer. But should there be swirl marks after I grind?

 

[INTMD8]

In my experience it seems to be rather aggressive when new, leaving some pretty noticeable marks. It grinds finer as it wears in and you could go back over where you started if you like.

I didn't and the marks are not noticeable after primer/epoxy/top coat

 

[ddewey78]

The more I'm thinking about it, I'm wondering if I'm using the right wheel. I'm using the one with like 6 or 8 blades. The concrete has some type of sealer on it.

 

[boobag]

how many grit does the disc have?

 

[nickm1024cobra]

I started grinding my floor with the home depot rental with diamabrush. It hardly took the shine off the finish trowel. Bought the 7" diamabrush and within seconds I was seeing aggregate with deep kiss marks. It definitely got less aggressive as I worked it more, but if it heels over in the slightest it will dig in pretty good. After the epoxy, flake, and top coat there are only a few marks that are really visible. I'd rather have those marks and know the floor is bonded than put in all that work and have it lift. Hope that helps.

 

[JonnyC]

It will certainly dig in if the shroud is suctioning to the floor. I had to add a washer or two when mounting the diamabrush so that the shroud would stay slightly off of the floor, otherwise it wouldn't move across the floor very well and would make some deep grooves.

 

[12ozd]

Pretty sure the 7" diamabrush only comes in 1 "grit".
You need to keep the diamabrush flat on the floor,as mentioned above.
Don't try to use it like a grinder.

 

[LegacyIndustrial]

Correct, keep it flat, light pressure.
People have a tendency to push the edge causing premature wear on the unit and swirls in the floor.

 

[Shea]

Something to remember as well, as long as you are putting down a heavier solids coating, preferably a primer coat as well, the swirl marks are not going to show and will be filled nicely. If you are only putting down a single coat low solids coating, then you may have issues.

 

[LegacyIndustrial]

The flakes hide many sins as well.


Sent from my iPhone using Tapatalk

 

[ddewey78]

Got about 70 sq ft or so done, its definitely less aggressive now. I'm getting the hang of it. But man this thing plugs shopvac filters!! About 10 minutes and its time to clean it, but that's fine, 10-15 minutes and my back is ready for a rest.

 

[Dick in Wisconsin]

Got about 70 sq ft or so done, its definitely less aggressive now. I'm getting the hang of it. But man this thing plugs shopvac filters!! About 10 minutes and its time to clean it, but that's fine, 10-15 minutes and my back is ready for a rest.

Are you using water?

I rented the floor polisher from Home Depot and a much larger (than 7") Diamabrush grinder. I was told fifteen times while filling out the paper work that I must use water with the Diamabrush grinder. I wetted the floor, ground, and if it started to dry out I watered it again.

Then I vacuumed the "slurry" up using a shopvac without a filter. Just got the stuff in the shopvac. When you're done, you'll have to shovel the slurry out before it hardens in the shopvac.

A 7" disk seems awfully small to me.

Isn't the Diamabrush a nasty looking piece of equipment? Don't use it near bare feet!

 

[ddewey78]

No water, I've heard it's messy and a pain to clean. And read its imperative that you get ALL the slurry up. Got some more done today, but the bag in the vac ripped, so it was constantly plugging the filter. It's OK, was approaching 90 in the garage.

 

[NitroShark]

You need this Vac (dry grinding). I used one for 1685 sq/ft with a 7-inch hand grinder and never had to stop for plugging up!


Shawn

 

[ddewey78]

I've read really positive reviews of the dust deputy. Looks kinda like something from a late night infomercial though. But there are a ton of positive reviews, and the only negatives I've read are about the construction and fittings, nothing negative about its function.

 

[LegacyIndustrial]

If this is a one-time grind for you and a 300.00+ shop vac is not on the budget, the dust-deputy is a great option and can be used for wood-working or similar projects in the future.

 

[12ozd]

but the bag in the vac ripped, so it was constantly plugging the filter.

Replace the bag.
I could only get 1/2 bag full before it would rip.
The dust is so fine, it will contour the bag to the bottom of the vac.
Then the weight of it pulls the bag from the connector, or tears it.
Buy a couple extra bags.
YMMV..