FireBoard Site Syndication http://www.metalcastingzone.com Thu, 02 Sep 2010 17:37:48 -0700 FireBoard 1.0.5RC2 http://www.metalcastingzone.com/components/com_fireboard/template/default_ex/images/english/emoticons/rss.gif http://www.metalcastingzone.com FireBoard Site Syndication http://www.metalcastingzone.com/metal-casting-forum/casting-supplies-general/re-constituting-petrobond#5229 I've read on other forums that you can save all your burnt petrobond sand & when you have enough you can re-constitute it with lubricating oil,it sounded a bit too good to be true but I gave it a go & it was useless!![to me anyway] has anybody done this succesfully? & if so can you let us in on the secret please thanks. Thu, 02 Sep 2010 21:30:56 -0700 http://www.metalcastingzone.com/metal-casting-forum/molds-mullers-and-mold-boxes/time-for-a-new-muller#5228 re-mixing/conditioning greensand [or petrobond for that matter] used to be a really back aching job,taking the fun out of foundrywork till I tried using a plaster type mixer on a 1/2" drill it's a hexagon rod with two disks about 3" in dia with holes in them & they're handed a bit like a propellor I have them about 3" apart the bottom one swirls the sand upover & the top one swirls it downover,you just swirl it about in the sand in a bucket the sand comes up like snuff!!! no need for mullers etc & you can allways pick drills up at carboot sales cheap. Thu, 02 Sep 2010 21:20:59 -0700 http://www.metalcastingzone.com/metal-casting-forum/lead-casting/lead-casting-green-sand#5227 hi jammer, yes it was sodium silicate or waterglass [my dad told me they used to preserve eggs with it during the war!!!] they were cylindrical about 2" in diameter with a steel hook cast in to hang them from the pulleys I used tubing for the patterns & put the steel hooks in from below,I melted the lead & poured it in then I played a sievert blowtorch on the top so it wouldn't leave a shrinkage depression [cast vertically open top] which was actually the bottom, I ''scrounged'' the sand ready mixed from a local jobbing foundry & put it in a plastic bag to take it home,I was wary of using greensand because of the water content,I suppose I could of used petrobond just as well, I had to break the molds to get them out so couldn't re-use again. Thu, 02 Sep 2010 21:01:56 -0700 http://www.metalcastingzone.com/metal-casting-forum/iron-casting/backyard-iron-casting-6#5226 cooooool!!! Thu, 02 Sep 2010 10:16:32 -0700 http://www.metalcastingzone.com/metal-casting-forum/general-casting-questions/not-much-about-copper#5225 hello i was just wondering why there isn't much about copper on here also i was wondering about a project i'm about to start i'm making my charcoal furnace right now one question i had is can you use straigt coal to melt al and copper? i have used it to melt al in a dug out hole in the ground with air from my compresser and it did fine QUESTION NUMBER 2 i'm wanting to copy some arrowheads i was left by a family member and maybe sell them as neclaces or orinaments for your rear veiw mirror would copper or al be better and what would be the best way to mold them any help would be great thanks from wv Thu, 02 Sep 2010 07:52:11 -0700 http://www.metalcastingzone.com/metal-casting-forum/general-casting-questions/investment-help#5222 A vibrating table is easy to make, just a plate with an air powered vibrator mounted to it and have it sitting on some springs for give. Have it tuned on while pouring the investment in and it works well. a vacuum chamber isnt to hard to make either, i made a couple from PVC pipe and just used clay for the seal. Cheap and easy thats my motto. Mon, 30 Aug 2010 17:26:50 -0700