Yes I mean Concrete, Can I , with a carbide bit, router an oval in
concrete, I poured a circular driveway with four large compass points
poured in the circle. I want to put the four oval N S E W breaa letters
I got for the compass. I think I probaby can as When I routered out the
hole in my table saw extention table a few years ago I inadvertently
routerd the 1/4 inch steel plate on the support legs with no apparent
damage to the router bit. I am assuming that the steel was harder than
How's your insurance situation...?
Steel may be harder than concrete as a whole, but it's not nearly as
abrasive. You won't get very far with a regular carbide router bit.
It'll dull to crap in no time if it doesn't break first. Steel is also
more uniform - you don't hit pieces of stone (read granite) in steel.
You really need diamond cutting tools with concrete and stone. Wet
cutting keeps things cool, but it's messy as opposed to dusty.
I'd probably use a diamond blade in an angle grinder to hog out most of
the recess and establish straight edge lines, then use a Dremel type
tool or a rotary shaft like a Foredom to do the detail work.
You can do it with a concrete router bit. I get mine at a
local tool supplier. I use them with concrete countertops.
They are diamond impregnated carbide bits. Plan to spend some
Here is one place that has them:
I found out the hard way a carbide bit will cut concrete. I cut a
perfect circle in my driveway, about 1/4" deep, when cutting a pierce
of plywood. It didn't even slow me down much. :-(
If you don't have a lot of material to remove it will work but the
bit will be toast. Wear good PPE.
Doesn't matter - what's the aggregate?
Anyway, no. Use an angle grinder instead.
Some people like to pour lead in as an infill afterwards (this also
hides variations in the groove depth). I find it weathers to a dull grey
which is indistinct, unless you coloured the concrete first. Sulphur
inlay is a more interesting colour, and easier to work with. I make
sundials this way, using slate tiles or brickwork as well.
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