why on earth use 4" of polystyrene ? .... you can use polyurethane, it is
much better for use with underfloor heating.
It is more dense, and much higher insulating value than polystyrene .
But if you want to cut it ... you could use a soldewering iron, but simpler
to use a stanley knife set to correct depth of cut - cut left & right side
then use a fork to scrape out the waste.
Not if you buy form Seconds & Co. ... you can buy any size, thickness and
style of foam - getting polyurethane for the price of polystyrene.
They have 2 outlets - but I think they are now unrelated.
I bought more than 60 sheets of foam, 50mm and 100mm ... saved a packet
compared to builders merchants.
He needs to make a polystyrene cutter
(http://www.techlib.com/hobby/hotwire_foam_cutter.htm ) for which he
will need Nichrome wire. The fact I still have a few km of Nichrome
wire is entirely immaterial.
If you need a few yards of the stuff it's sort of free (you are
requested to post what its worth to you in the next RAF Benevolent
fund box you come across). Get in touch if you need some.
that seem to be getting sold cheap all over these days have, *I think*,
copper wire elements which just get hot by passing a huge current through
the wire. Strip wire from some T&E and shape a new 'element' to the
desired cutting profile - bingo . . . .
Flaws anyone?, are those elements really just copper?
Errm, you don't need nichrome, unwinding one strand from a steel bicycle
brake cable works perfectly. If it is clamped into a fretsaw frame
(suitably insulated) and fed with current from a 12V source via a
rheostat it works very, very well.
"I have come up with a sure-fire concept for a hit television show,
which would be called `A Live Celebrity Gets Eaten by a Shark'."
Constantan wire from Maplins also works well.
For straight cuts I suspend a piece from a batten fixed near the garage
ceiling tensioned with a weight. Croc clips supply the power (6V or
12V), and you slide them closer or further apart to get the required
temp. 18" is about right for 6V, IIRC.
I guess for troughs you could make a "U" shape, but it wouldn't be very
SIMON MUIR, UK INDEPENDENCE PARTY, BRISTOL www.ukip.org
Yes but think of the nuisance, first you have to buy a bicycle, then
dismantle the thing, then having extracted one strand of brake cable
you have to go and buy a replacement brake cable. I mean it's a
right hassle compared with my free offer :-).
Could you 'wobble' a circular or bench saw blade to cut a
groove/slot in the foam?
I've done this to cut shallow slots in the uprights for a book
case, in which to fit the horizontal shelves.
To wobble the saw, washers etc. were clamped in the bench saw
arbor, on both sides of the blade to tilt it 'off centre'. A few
experimental cuts with adjustments and it worked fine to a depth
of between a quarter to half inch, in plywood cutting a three
quarter inch wide slot. (So the outer edge of the blade had to be
wobbling about three eighths off centre line.)
In a soft material such as foam probably no trouble cutting say,
20 mm wide to a depth of say 40 mm?
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