prepman
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Ah....so it's the negative I saw? Or an stl image?
- Thread starter Onoff
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Onoff
In the land of the unfinished project I am King!
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What orientation would I have the positive, vertical, flat, face down?
Is dipping consistency for the plaster different to encasing consistency?
I presume I need to incorporate a "cone" with a hole in for pouring the brass? Any tips? Could print something that could clip/glue to the positive.
prepman
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Trying to work out out why I've got an oozing nozzle.....thought it was just old age
...but I'll try with maximum retraction at > 8mm and lower extruder temp further....but to no avail so far.
stl test file attached not mine...v'scan as I'm on linux almost bullet proof.
...but I'll try with maximum retraction at > 8mm and lower extruder temp further....but to no avail so far.stl test file attached not mine...v'scan as I'm on linux almost bullet proof.
Kram
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No cones unless you want it to come out a mess, just a hole in the back or open back is fine, the supporting structure/feeder will be in sand.
Kram
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Possibly wants to be thicker than the ceramic people use. It will likely have some cracks when drying. 1cm wall should be good. If you use too thick it will take an age to burn.
Onoff
In the land of the unfinished project I am King!
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Again, surely you can't pour brass into PLA?
Onoff
In the land of the unfinished project I am King!
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Noo that would be a messPla> plaster> burnout> brass
I was more thinking a paper thin PLA shell that gets vapourised or whatever by the brass going in.
Or again a slightly oversized shell you plaster dip, coating inside and out surfaces.
Ignore my mad musings!
prepman
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Refractory looks brilliant, very pleased and it's good for (1,700C) way in excess of the temps I'll be going to.
Will tidy it up lid and put a catch on the swing mechanism that will stop it lowering when not in the centre position. Simple pin and gate like this.
Crucible didn't fare so well. The underside..
Will tidy it up lid and put a catch on the swing mechanism that will stop it lowering when not in the centre position. Simple pin and gate like this.
Crucible didn't fare so well. The underside..
Onoff
In the land of the unfinished project I am King!
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On the way back from the pub just now...
A couple of gas cylinders on the adjacent farm's junk pile, destined for the scrap man. No idea what "kg" they are, but I can likely have them both:
The "grey" one, nom 1030mm circumference:
& 18" / 450mm high:
& then a "red" one. Nom 450mm / 18" high:
Nom 1070mm circumference:
I presume these will be suitable?
A couple of gas cylinders on the adjacent farm's junk pile, destined for the scrap man. No idea what "kg" they are, but I can likely have them both:
The "grey" one, nom 1030mm circumference:
& 18" / 450mm high:
& then a "red" one. Nom 450mm / 18" high:
Nom 1070mm circumference:
I presume these will be suitable?
Onoff
In the land of the unfinished project I am King!
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Let me know the height of yours to the apex of the dome if you would.
Some photos of your one that I took today:
Crucible:
Hole / mounting for the thermocouple up and to the right of where my finger is sat, see the two button head cap screws:
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prepman
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Borax....No not a typo
Old one used and abused. Stuck to old furnace floor. But all tend to craze.
Onoff
In the land of the unfinished project I am King!
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Just had to order 3 x 47kg propane refills at £88 e@
Calor up £13 ea
There are cheaper gas companies around but the hassle with cylinders isn't worth it. Did that years ago. Calor has firmly clenched my gonads.
I'd planned on a leccy element like @Kram but given the unit price of that I might have to build a bio-gas plant!
(I'm not kidding)
prepman
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Don't rely on EU funding.......I'd planned on a leccy element like @Kram but given the unit price of that I might have to build a bio-gas plant!
(I'm not kidding)
Although 2nd to Ukraine in Eurovision is a major acheivement for us now. Most likely drive Putin to Nuke us?
