More bollocks from harry.
*all* commonly available pipe is half hard these days, and has been so
for many years.
Its perfectly suited to bending with a proper bender. The thing you
can't do so easily with half hard pipe is use a bending spring.
You would not spring bend 22mm or 28mm around your knee - but you might
with a hole through a bit of 2x4 wood - that was my old man's preferred
method. Might stil have said bit of wood kicking around with a nicely
rounded off pair of holes (one for 15, one for 22).
Bending springs are handy if you need to make a few degrees tweak to a
machine bend to fit perfectly - either bending some more or unbending a
tad. Never try without a spring - you can do about 1 degree before it
kinks - been there...
That's not sod's law, it's feckless, profligate, wanton foolishness.
Never, EVER throw anything away. You never know, it might come in, and
even if it doesn't you'll have the continuing pleasure of ownership.
I learnt this principle at my father's knee, and I can look at our
shelves and see items such as a box of Art Deco Bakelite radio knobs, a
collection of Wylex mains plugs, a spokeshave without a blade, a brand
new oil filter for a 1948 Morris Commercial, and a flat iron with a
chunk out of it.
I never throw away useless junk!
My father, when he was alive, always kept things claiming they would
come in useful one day. After his death, and my mother wanted to move
house, we had to hire a large skip to get rid of all this useful stuff -
nothing was kept.
I'm trying not to keep anything I haven't used/seen for a couple of
years, especially old electronic equipment. It may have been relatively
expensive when I purchased it when when I upgrade its usually worth next
to nothing and difficult to even give away.
For 28mm, I used dry sand fill, and bent it over a bag of builders sand.
That was after carefully anealing just the area where I wanted it to
bend, and that worked well as it didn't bend outside the freshly
anealed area. The instructions came from a very old book on working
with copper, which I found in a second-hand book stall in Luton market
many years ago. The bend required was only about 20 degrees.
To clean out any sand dust afterwards (as it's a gas pipe), I used the
vacuum cleaner to suck a large cotton wool ball through the pipe many
[email address is not usable -- followup in the newsgroup]
Does anyone know why the move to half-hard tube was made? Was it to
compensate for the tube being thinner with respect to compression fittings?
Apart from such fittings, is there any reason that annealing a section
of tube for bending (as Andrew suggests) would cause any problems?
I've read about doing this - but when I have used a spring for other than
a very gentle bend it has to be 'unwound' to remove. Knowing my luck the
string would simply break. So I'll stick to my pipe bender - which cost a
lot of money ages ago. Now they've come down in price so much there's no
excuse not to have one.
*Funny, I don't remember being absent minded.
Dave Plowman firstname.lastname@example.org London SW
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