My only concern is that your 4" grinder will cut deep enough. That's some
pretty rough stone.

If you have never cut stone like this with a diamond blade you will be
surprised just how smooth it cuts. You may think that you aren't cutting at
all. Just don't bind the blade or its going to kick and chip.



"Walter R." wrote in message
.. .
Thank you for your advice, Cliff

All the pros I talked to recommended the undercutting method. The way you
describe it, it should work. My 4" angle grinder sits 1/2" off the ground
and should give me the perfect height and depth of cut.

What concerned me also was the need to allow for the expansion of the
hardwood floor. The best way of doing this is to let the wood move in the
undercut under the stones.

--
Walter
www.rationality.net
-
"Cliff Hartle" wrote in message
news:28cZh.3585$iR2.1714@trnddc05...
First off scribing won't work. It will leave a jagged edge and will
never look right.

You need a right angle grinder with a dry cut diamond blade.

Like these

http://www.bobcometal.com/bobcomall/...s/9527PB_l.jpg

http://www.diamond-saw-blades.com/im...ck%20Point.jpg

I don't know whether a segmented or continuous rim blade will work
better. I think a segmented blade cuts faster but rougher.

In order to get a good straight cutt you need to make some sort of holder
for the grinder that slides along the floor that can hold the blade the
requierd 1/2" above the floor.

Its going to make a ton of dust, you may want to make a tent out of sheet
plastic and hold a shopvac hose close to the grinder.



"Walter R." wrote in message
.. .
I am putting wood planking in my living room. Some of the planks will
butt against the fireplace hearth, which consists of petrified wood set
in mortar. The area where the stones meet the concrete pad is very
irregular due to the irregular shaped stones. The floor is a concrete
pad.

For a neat installation and in order to provide for some expansion, I
will need to undercut the fireplace hearth by 1/2" so that I can slip
the ends of the planks under the stones.

http://tinypic.com/view.php?pic=48zmrsh

I have a 4" electric grinder. Will that be suitable for cutting a 1/2"
undercut into the rocks? What kind of blade(s) should I use? I bet this
is going to be a very dusty affair!?

Any advice appreciated

--
Walter
www.rationality.net
-


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