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Posted By: Phil.Chaddah-DukeWhat kind of glue is being used In these videos
Posted By: fostertomAFAIK any gap even fag paper thickness is a bypass heat-leak route, with quite strong convection forces causing constant (if slow) circulation of air from wall to surface and back.
Posted By: spoonandforkWhat are the pros and cons of rockwool compared to EPS for EWI? Are the edges easier to fit tightly?
Posted By: nikhowardwhat is the best wire to 'recycle' for the wire?
Posted By: TimSmall10 amps at 12 volts = 120 watts (watts = volts x amps).
Posted By: TimSmallDoesn't need to be trial and error...an02ew is sinking approx 10 amps at 12 volts into his 400mm length of wire.10 amps at 12 volts = 120 watts (watts = volts x amps).So, he finds 30 watts per 100mm to be about right.So for a car battery charger (nominally for a 12v battery), the rating in amps will determine what length of wire you can drive at 30 watts per 100mm. e.g. for a 4 amp charger, power is 4 * 12 = 48 watts, so you can do 100mm x (48/30) = 160mmOK, so now you've got the approx wire length (I should think you can vary this a bit tho - a slightly longer wire will just give you a slightly slower cut).... now to work out which thickness of wire you need.Going back to Andrew's 10 amp set-up - in order for the current to go to 10 amps at 12 volts (ish), he needs the wire resistance to be about 1.2 ohmsvoltage drop (across a resistor) = current (in amps) x resistance in ohms12 = 10 * resistanceso resistance = 12 / 10 = 1.2 ohmsso for his 400mm length of wire, the resistance per meter needs to be 1.2 * (1000/400) = 3 ohms per metre.Since a car battery charger is a constant-current (or rather current-limiting) device, you can get away with something a little lower, and sure enough, if you look up 22swg ni-chrome wire (0.7mm approx) , it's spec is 2.7 ohms per metre.If you were going for the 4 amp charger instead, you'd then need 12 / 4 = 3 ohms of resistance in your 160mm wire, so you'd want something like 3 * (1000 / 160) = 18.7 ohms per metre nichrome wire. So .28mm wire would do it.If on the other hand you think that .28mm wire sounds a bit skinny+fragile, then you might need to invest in a beefier charger!If on the other hand, your 4 amp charger has a setting for a 6 volt scooter batteries as well as for 12 volt ones (mine does), then you can use thicker wire to get the same result...So on the 6 v setting, you want 6/4 = 1.5 ohms. ... so wire which is 1.5 x (1000/160) = 9.4 ohms per metre.375mm looks like it'd do the trick at 9.7 ohms per metre...
Posted By: nikhowardHi Tim, thanks for that, good work. Are you a physics teacher? You will be giving steamy a run for his science money.
Posted By: Cav8andrewprobably a daft idea but could you use a thin strip of tempered steel, similar to a saw blade or are the currents/voltages required too great to create a hot surface.
Posted By: an02ewi think thats a no, too much resistance for the 10 amp charger?
Posted By: an02ewMaybe you could help with my next problem? i am trying to think of a way to profile cut the EPS, so holding the wire in a simple arc to shape the corners of the eps around my window revels? any ideas?
Posted By: djhPosted By: an02ewMaybe you could help with my next problem? i am trying to think of a way to profile cut the EPS, so holding the wire in a simple arc to shape the corners of the eps around my window revels? any ideas?Perhaps use several passes with your straight wire to make an approximate curve, then round it off with the render?Or use a much longer wire parallel to the surface to cut the whole edge at once. But you'd need to go much slower or use a lot more power.If you have access to James Bond's quartermaster, a CNC laser cutter could probably do the job.
Posted By: djhif a worker breathed in about two-thirds of the particles released
Posted By: fostertomPosted By: djhif a worker breathed in about two-thirds of the particles releasedTo capture that %age of the particles he'd need a vacuum cleaner attached to his nose.
Posted By: an02ewi was thinking more about trying to suspend/hold the wire in a set curve to enable to feed different lenghts of EPS, i have racked my brain, but just cant seem come up with a solution
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