42214Re: Spray type mold release?
- Oct 3, 2012Not a bad idea Rupert. One of the main problems is getting the Johnson's wax between all the fins. Seems easy but there's bolt bosses and a spark plug boss that's raised up between them so there's a lot of different reliefs going on. Heck, some of the problem could be my lack of patience which has nixed me before....
--- In email@example.com, Rupert <rwenig2@...> wrote:
> Hello Lyle,
> My words weren't clear and I assumed your using sodium silicate sand.
> Johnson's paste wax should work as long as you have complete coverage. I
> meant to fill the spaces between the fins with the SS sand, pack it only
> firmly (don't ram it). Rap the head on the side so the sand loosens a
> bit. Then, gas it to harden. I think the hardened mix should fall out.
> Do this for every space. Place them in place between the fins and make
> the complete mold again using SS sand as it should bind to the
> previously made fin cores. Only a firm packing is needed- don't ram it.
> Again, rap the head enough to loosen it before gassing. The head should
> fall out when you turn the flask over provided there are no undercuts to
> consider. Don't know if this will work with other types of resin set
> sands. But, I do think the SS sand should work.
> On 10/2/2012 9:27 PM, Lyle wrote:
> > Rupert, Thanks for the idea but the pattern is one piece. Today after
> > work I used a masonery bit to free the pattern out of the sand which
> > looked a little like sandstone. I have another oil cooler pattern
> > which has similar depth fins but not as many that I used as an
> > experiment for the head castings. I am going to try a reduced amount
> > of binder to see if that helps and less ramming of the sand. Usually
> > deep fins need to be jolted, which I did, but I also rammed, so I'll
> > try jolting. the learning continues....Part of the problem is me
> > using Johnson paste wax as a release but it's hard to get it between
> > all the fins which are about 1/4" apart and 2" deep. LL
> Rupert Wenig
> Camrose, Alberta, Canada.
> email: rwenig2@...
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