On Friday, November 2, 2012 6:16:28 PM UTC-6, JayPique wrote:
I use a manual and electric knife for cutting various upholstery foams and use 781 dry silicone to help the knife glide through the foam easily. I don't know about foam insulation. Might try some 781 dry silicone to help the knife glide through the insulation. Should be available at your local upholstery supplier - http://www.perfectfit.com/24783/247264/Upholstery-Adhesives/VS-Dry-Silicone-Spray.html Just whisk a light coating onto the knife blade and cut away. Respray the blade periodically/after several cuttings.
781 dry silicone to help the knife glide through the foam easily. I don't know
about foam insulation. Might try some 781 dry silicone to help the knife glide
through the insulation. Should be available at your local upholstery supplier -
Just whisk a light coating onto the knife blade and cut away. Respray the blade periodically/after several cuttings.
At home I just plop foam insulation down on the table saw and treat it
like wood. Helps to have a big cyclone dust collector.
When I'm not at home a snap blade knife does fine--the kind that
DoItBest sells for 3 bucks.
Never thought to try lubing the blade--next time I have foam to cut I
may try some bowling alley wax on it.
A hot wire works great on ridgid insulation foam. You can do very detailed
work. At that thickness, it may be slower than you like, though. DON'T use
it on polyurethane foams - makes toxic fumes.
Depends on the "foam."
Putty knives work great on some rigid without sharpening and not great
on other stuff without sharpening.
I'm still not convinced everyone in this thread is talking about rigid
foam when offering their opinions.
"Playing is not something I do at night, it's my function in life"
For 1", use a nice little linoleum (or other hawkbilled) knife.
http://tinyurl.com/bfgu6vw Firefighter kerambit (in my truck)
http://tinyurl.com/a2besvd rigging knife (in my backpack)
While we have the gift of life, it seems to me that only tragedy
is to allow part of us to die - whether it is our spirit, our
creativity, or our glorious uniqueness.
-- Gilda Radner
Depends on how big of mess you want to make. A serated knife will cut
through foam effectively, but creates a bunch of static charged dust that
gets all over the place.
A long thin (really thin) non-serated blade will make less mess, but at
the expense of signifcantly increased drag as you try to cut through the
material. A sharp and honed blade does help quite a bit.
A hot wire foam cutter would be the next best thing. If you make your
own, you can do it for a fraction of the cost of the commercial ones. I
used a model train set transformer and some replacement hot-wire tool
wire (from the hobby shop) as the base of mine. The wire needs to be
stretched between a couple of posts for straight cuts, but that's easy
enough from a woodworking standpoint. If you're interested, I can point
you to more detailed instructions.
For carving, a SurForm rasp does a great job at making a mess and a good
job at carving.
I agree w/ Puckdropper. I have made my own hotwire cutter the same way.
Also a kitchen knife works ok. I have a jig saw blade that is basially a
razor blade. You can make your own by taking a carbon steel blade and
using a belt sander to put a blade on. I would try the silicone spray,
or teflon spray too on a kitchen knife or jig saw blade.. don't re-use
the kitchen knife after that.
On 11/2/2012 11:17 PM, Puckdropper wrote:
Depending on the type of foam and shapes you need: CNC router, angle
grinder with flap disc, and/or hot wire cutter.
A handheld router, scroll saw, or coping saw work in a pinch, too.
If you're really dextrous, try a katana. Please film it if you do.
BTW, I love your question. It reminds me of people who would call the
body shop on the phone and ask for an estimate for their collision
damage with "It's a blue Chevy, I think." as the entire details.
The great thing about getting older is that
you don't lose all the other ages you've been.
-- Madeleine L'Engle
Just to add to the list...
A hand saw would work well. The traditional Western-style saw will make
short work of the foam, at the expense of staticy dust and rough edge.
Since you'll get a rough edge anyway, it doesn't even matter if it's very
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