Hi
There's a problem... It's for vertical loading and the carbon will contaminate
the circuit. I know those furnaces well, it's used in recycling Aluminum and
for casting. I wanna make a "Liberator" (3D printed gun) into metal
using one of those already for a while.
However, those furnaces are unsuitable for chip making I'm afraid.

Cheers
-lev

On Monday, April 12, 2021 10:49:52 AM WEST Martin Geisse wrote:
> Hi,
>
> so here's some more thoughts about the glove box:
>
> - furnace
>
> I found this mini furnace manufacturer: https://www.tabletopfurnace.com/
>
> They are somewhat outside our price range, about $500, but otherwise they
> match quite well, e.g. https://www.tabletopfurnace.com/product/quikmelt-10/
>
> That furnace is electrically powered (you probably shouldn't use a propane
> furnace indoors), it's tiny so less heat is wasted, and due to its size it
> should be possible to attach it to the back side of the glove box. I still
> think that having the furnace inside the box is a problem because the heat
> cannot escape well, but having it outside and connecting it through another
> opening in the box should be possible.
>
> - insulation
>
> You'll still probably have to thermically insulate the furnace from the
> glove box (even if the back wall is made of sheet metal and not acrylic).
> My first idea is to use calcium silicate boards, e.g.
> https://www.promat.com/en/industry/technologies/calcium-silicates/high-tempe
> rature-insulation/
>
> These boards are used to insulate masonry heaters from walls and can take
> up to 1000°C -- the outside of the furnace is probably not as hot, so that
> should be enough. My guess is to use high-temperature mortar to glue the
> boards to the furnace (keeping the inside dust-free, it's a clean room
> after all) and something more flexible, e.g. high-temperature silicone, to
> glue the boards to the back side of the glove box. If both connections were
> rigid then it would break too easily, especially with thermal expansion.
>
> The alternative would be rock wool, but that stuff is nasty (at least if
> it's similar to glass wool). Calcium silicate is similar to gypsum in
> handling, just more expensive.
>
> - spin coater
>
> My first idea to make this cheap is an axle connected to a disk and mounted
> in such a way that the axle can spin but not tilt. You could then attach a
> handheld drill to the bottom of the axle to spin it.I still like the idea
> except that the disk has to be inside the glove box and the axle has to
> leave the box at the bottom, so keeping it dust-tight AND freely spinnable
> but not tiltable is the main challenge with that. Someone who is wiser in
> mechanics can probably do that easily.
>
>
> Greetings,
> Martin
>
>
>
>
>
> On Sun, Apr 11, 2021 at 12:24 PM David Lanzendörfer <
>
> leviathan@libresilicon.com> wrote:
> > Hi
> > Maybe you can join today 6pm UTC on our Mumble server
> > murmur.libresilicon.com
> > and we can discuss where to best place the airlock and how to build it the
> > easiest and cheapest way?
> >
> > Cheers
> > -lev
> >
> > On Sunday, April 11, 2021 8:17:01 AM WEST Martin Geisse wrote:
> > > Hi David,
> > >
> > > some ideas / questions:
> > > > I was thinking about using sheet metal for everything
> > >
> > > Pardon my ignorance, but how are you going to see what you are doing in
> > > there? Did you mean that one side is still acrylic? Front or top?
> > >
> > > > airlock
> > >
> > > If this is on the side wall, then it is probably hard to reach with your
> > > hands. On the other hand, the back wall (opposite of the gloves) is the
> > > most precious space you have and "wasting" it for the airlock is not
> > > good
> > > either...
> > >
> > > A quick idea would be to attach the airlock at the bottom, with the
> > > outer
> > > door facing towards you and the inner door being a "trap door" in the
> > > bottom of the box.
> > >
> > > > tools
> > >
> > > If everything happens inside the box, space is even more precious.
> > > You'll
> > > need storage for the materials and chemicals, illumination stage, hot
> > > plate, spin coater, furnace, ... A rotating shelf on the back side might
> >
> > be
> >
> > > a solution for that.
> > >
> > > OTOH, an unsolved problem is be what the residual heat of the furnace is
> > > going to do to the acrylic box...
> > >
> > > > gloves
> > >
> > > Gloves always bring the danger of trapping hazardous chemicals *inside*,
> > > right next to your hands. You'll probably need a material that
> > > withstands
> > > *all* of those chemicals, otherwise you might have the piranha etch make
> > > the gloves porous and then HF leak through them... A simple warning not
> >
> > to
> >
> > > spill anything over the gloves is probably not enough because these
> >
> > things
> >
> > > just happen anyway.
> > >
> > > Greetings,
> > > Martin
> > >
> > >
> > >
> > > On Sat, Apr 10, 2021 at 11:33 PM David Lanzendörfer <
> > >
> > > leviathan@libresilicon.com> wrote:
> > > > Hi
> > > > I was thinking about using sheet metal for everything which doesn't
> >
> > need
> >
> > > > to be
> > > > transparent (even cheaper than acrylic glas).
> > > > For the airlock I was figuring I could do a cut out like in the
> >
> > attached
> >
> > > > screen and fold it, then either weld or screw an aluminum box made
> > > > from
> > > > folded
> > > > sheet metal as well.
> > > >
> > > > What do you think?
> > > >
> > > > Cheers
> > > > -lev_______________________________________________
> > > > Libresilicon-developers mailing list
> > > > Libresilicon-developers@list.libresilicon.com
> > > > https://list.libresilicon.com/mailman/listinfo/libresilicon-developers