I'm with you on that Rick! I started out with petrobond back in the 70's but a couple of years ago I tried out some "olivine" greensand and like it just as well. My petrobond all of the sudden lost its strength and I was unsure how to fix it since I didn't have a muller. Anyway I picked up the greensand and it works great. Thanks to Joe and the Portland Oregon guys I was able to re - constitue my petrobond and it now has great strength too. I might try some lost foam in the future and watched Dave( a member of our group) do a lost foam pour which turned out excelent. He was a pattern maker so he always has great patterns and projects!
Cheers Wonk
--- In gingery_machines@yahoogroups.com, "Rick Sparber" <rgsparber@...> wrote:
>
> Wonk,
>
> Yes, we are mostly a club of machinists although at least 3 of us do
> casting. I find lost foam interesting but get such good results from
> Petrobond, I'm not about to switch.
>
> Rick
>
> -----Original Message-----
> From: gingery_machines@yahoogroups.com
> [mailto:gingery_machines@yahoogroups.com] On Behalf Of Wonk
> Sent: Saturday, April 02, 2011 4:05 PM
> To: gingery_machines@yahoogroups.com
> Subject: [gingery_machines] Re: Shaper patterns for sale on ebay
>
> Thanks Rick!
>
> That casting party looks like many we have attended here in the Pacific
> Northwest! The garbage can furnace is much like the first one I made to burn
> charcoal! I use a much smaller but bigger crucible furnace now since I have
> read Mike Porters book and switched to propane. I believe your club is more
> for machinists than casting so many probably have lathes and mills to make
> the castings work! The example near the end looked pretty rough but the
> machined version looked great. One day I will have to give lost foam a try!
>
> Cheers Wonk
>
> --- In gingery_machines@yahoogroups.com, "Rick Sparber" <rgsparber@>
> wrote:
> >
> > Wonk,
> >
> > Here are some pictures from my club, Valley Metal:
> >
> > http://www.valley-metal.org/Lost%20Foam%20Casting/index.htm
> >
> > Rick
> >
> > -----Original Message-----
> > From: gingery_machines@yahoogroups.com
> > [mailto:gingery_machines@yahoogroups.com] On Behalf Of Wonk
> > Sent: Saturday, April 02, 2011 1:38 PM
> > To: gingery_machines@yahoogroups.com
> > Subject: [gingery_machines] Re: Shaper patterns for sale on ebay
> >
> > I would like to see some examples of the lost foam Gingery castings, have
> > you guys made some? Or really any castings from foam would suffice so we
> can
> > see how that works!
> >
> > Wonk
> >
> > --- In gingery_machines@yahoogroups.com, "Chris (CB)" <boyercl@> wrote:
> > >
> > > The advantages with foam are simplicity of pattern making.
> > >
> > > Draft -- dont need it.
> > > Undercuts and weird shapes -- not a problem..
> > > Foam is relatively cheap.
> > > Easy to work with the most basic of tools.
> > >
> > > If its a 1 of piece foam may often be easier.
> > >
> > > It you need 100 of them thats a different story...
> > >
> > > Yes you loose a pattern if there is a problem.
> > >
> > > So start with simple patterns till you learn to cast foam...
> > >
> > > On 4/2/2011 12:43 PM, Wonk wrote:
> > > > I don't see the advantage with foam over wood patterns unless you
> don't
> > want to ram sand moulds! Also the other problem if something goes wrong
> your
> > pattern is also gone, where-as with wood you can cast many times! I agree
> > with the previous post that if you can figure how to machine metal, wood
> > should be easy? I used the hobby store bass wood which seems to be
> > dimensionaly sound and easy to cut with hand tools, glues great and once
> > sealed with several coats of varnish seems to hold its shape well even
> when
> > packed away for several years.
> > > > I'm making my third set of castings from the original patterns
> starting
> > in the 70's to present. I rarely hear that someone is sharing patterns or
> > selling - works of art and should be kept for show and tell! Ha!
> > > >
> > > > Cheers
> > > >
> > > > --- In gingery_machines@yahoogroups.com, Ron Thompson<ron@> wrote:
> > > >> On 4/2/2011 11:47 AM, Wonk wrote:
> > > >>> Ron how do you maintain accuracy with lost foam? would seem you
> would
> > > >>> have to cast a bit oversize and machine until your there? I guess
> CNC
> > > >>> comes into play but then you have to start somewhere!
> > > >>>
> > > >>> Wonk
> > > >>>
> > > >> No cnc needed for simple patterns. If you can cut wood to dimension,
> > you
> > > >> can do the same with foam. you can glue it together just like wood.
> > > >> Some patterns may need bracing to keep them straight, but that isn't
> a
> > > >> huge problem.
> > > >>
> > > >> Another thought is for people with the patterns. Maybe you might want
> > to
> > > >> sell casting kits. Works for steam engines.
> > > >>
> > > >> --
> > > >>
> > > >>
> > > >> Ron Thompson
> > > >> On the Beautiful Florida Space Coast, right beside the Kennedy Space
> > Center, USA
> > >
> >
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
http://groups.yahoo.com/group/gingery_machines/app/peoplemap/view/map
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