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| Square lil bertha |
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| Will_D:
I am also think of a similar project. Love the idea of the Tig shrouds! One thing to think about is electrical safety. I will be using SSRs to switch the elements via a PId controler. As the furnace will have a lid, it will be simple enough to put a micro-switch or 2 in series with the 12v switching circuit for the SSRs, so that when the lid is removed the elements are automatically switched off. Why 2 in series? - so that if one failed closed the other will still break the circuit! |
| shipto:
I agree foam would have been a lot better it would need securing well though and I was thinking about pinning it in will see how this works out once it has dried properly which I think is going to take a while. Good luck Will the tig shrouds where a godsend and I may not have thought of them except I recently brought a arc,tig and cutting unit so had them in the shop. |
| shipto:
I have left it with about 2 kilo's of silica gel inside it in hope that it will dry it out a bit quicker. Also got the electrical connections sorted out forgot to take a pic of them in place but will do that tomorrow. The modellers clay is supposed to be baked at 130°C for 15 minutes so I need to borrow my mates paint stripper to try and do this. Regarding electrical safety I too am planning to add a safety switch on the hinged lid to shut off the power when its open. |
| Manxmodder:
--- Quote from: shipto on April 20, 2016, 12:49:11 PM ---I agree foam would have been a lot better it would need securing well though and I was thinking about pinning it in will see how this works out once it has dried properly which I think is going to take a while. Good luck Will the tig shrouds where a godsend and I may not have thought of them except I recently brought a arc,tig and cutting unit so had them in the shop. --- End quote --- Agree,the foam and burn out method sounds really good. Small dabs of adhesive from a hot melt glue gun would be a good way to fix the foam to the inner lining tube as the glue wouldn't be too difficult to separate from the liner. A liner made from thick cardboard and waxed on the outer face would be easy enough to remove as you could cut it lengthwise and collapse it inwards to remove OZ. |
| Swarfing:
To stick the foam we used a bit of copydex adhesive using it like contact adhesive because it was to hand. the good thing about it was we just peeled it off before torching the foam out. |
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