I just got an reverse osmosis filter. The first step in installation
is to make a one and a quarter inch hole in the sink top for it's
faucet. I bought a bimetal hole saw of that size and proceeded to try
to drill a pilot hole with an 1\\8 inch metal bit...no luck. Tomorrow
I'll go buy something else for the pilot hole. I'm thinking I may need
an abrasive bit for the porcelain layer and then switch to the
bimetal. Anybody know?
I drilled a hole in my porcelain sink for an RO faucet too and it was easier
than I thought it would be. The key is to get a carbide hole saw. I got mine
from Home Depot, about 20.00
Go slow to minimize chipping.
If you want a neat hole, it will take some tools. I would start with an
deep X cut with the edge of an small abrasive disk to locate the center.
Then carbide drill for a mandrel hole. Then a carbide, or better diamond,
hole saw. Switch to bimetal for the steel or cast iron.
If you want a sloppy hole, just chip off the porcelain with a mallet and
chisel. Score the outline with a template and carbide or diamond scribe
for better results.
Copper or brass tubing of the diameter of the hole you want to drill
and some coarse silicon carbide abrasive grit. Cut a few slots in the
end of the tubing, make a dam with putty around the drilling site. Add
grit and water to the dam and use the tubing as the drill with it's end
charged in the grit every few seconds.
Uh, you left off telling him how to spin that 1-1/4" tubing other than
by rolling it between the palms of his hands.
Seems unlikely that he'd have a power drill around with a chuck that
large. (Or could lift it if he did. <G>)
OTOH, if he found that a 1" copper sweat pipe cap was the right size he
could drill a 1/4" hole centerED in it's end and use a well tightened
bolt and nut as an arbor he could chuck in a drill.
A plumber told me that those reverse osmosis filters waste a huge
amount of water.
You might consider running your tubing to a 5 gallon bucket instead
of dumping it down the drain.
a. It lets you see how much water you are wasting.
b. You can use it water your plants.
So I bought a Hitachi carbide grit hole saw at Lowe's for eleven
bucks. It has a pilot bit attached. It went through the sink pretty
easily. The pilot bit was sort of a spade bit arrangement with a piece
of carbide on the end of a shaft. The shaft was a smaller diameter
than the carbide so once the carbide went through the bottom of the
sink material I lost some tightness from the guide bit, which
roughened the cut up a bit. The faucet flange is big enough to cover
the area around the inch and a quarter that was cut up some. If I
needed a real clean Inch and a quarter hole I'd probably use something
else, but this worked well.
yeah I suspect a precision cut would require a at leats a $30 - $50
probaly just a solid heavy bit, not a hole saw type
*the spade bit I bought for drilling cermic didn't have grit
I always like it when I have the right tools for a job
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