On Wed, 19 Dec 2007 10:52:50 -0500, with neither quill nor qualm,
"Chas Hurst" quickly quoth:


wrote in message
...
Hi all,
I´ve the following situation: 4 mm mild steel plate in which I made 6
mm holes with thread. In these holes I put bolts which I first dipped
in epoxy to fix them in position and seal the thread waterproof. I
screw the bolts in only for the thinkness of the plate, so a large
part of the bolt and head is above the plate. After the epoxy is cured
I cut the bolts with the angle grinder and grind what is left of it
down until it´s surface is flush with the plate. The problem: cutting
the bolt makes it really hot and the epoxy is only capable of
withstanding temperatures up to 150 deg c. Above this it burns and
does not seal anymore. What I tried to do is spray water onto the bolt
while cutting. It seems to keep the proces a lot colder, but also
somehow the cutting becomes slower with the water. Does anyone have a
suggestion how to do the cutting and/or the cooling differently,
better?
greets, Joost Jager


I would fill the holes with 3M 5200 sealant. It remains flexible, so
sandblasting will have little effect on it.

If he's just going to fill and seal them anyway, why not just NOT
drill and tap those holes in the first place? What a timesaver!
gd&r


--
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