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Type: Posts; User: alcufe

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    The 3d printing of the sand mold is probably an...

    The 3d printing of the sand mold is probably an ExOne printer. I've been to a foundry that had one of those. It does it by depositing sand and glue layer by layer until it builds a mold. So since you...
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    Ugh, my mistake. I had two tubs of playsand and I...

    Ugh, my mistake. I had two tubs of playsand and I forgot one of the sand was premixed with bentonite which I haven't used in ages. They both look so alike when dry!

    I just tested a small sample...
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    Why is my sodium silicate not binding?

    I mixed some sodium silicate today and unsuccessfully tried to make a core. For some reason the sand mixture wouldn't bind.

    Any reason why it wouldn't bind? Maybe too much sodium silicate? I had...
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    A Haas toolroom mill (TM-1?) is another viable...

    A Haas toolroom mill (TM-1?) is another viable option, except for the 3-phase power. It's not that much bigger than a bridgeport... maybe a little bigger... but much smaller than any vertical or...
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    Sticky: I'm actually in a middle of printing a core box...

    I'm actually in a middle of printing a core box and split pattern (to be mounted on a match plate) for a cast iron foundry as a test actually. The core box took 50 hours to print each side because it...
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    May be a possibility, they look like sand...

    May be a possibility, they look like sand inclusion when the loose sand moves into the cavity. Did you try different gating system with a longer runner and wells to possibly trap it? Or maybe your...
  7. Thread: Sources of CO2

    by alcufe
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    I tried the coke/mentos thing and it works in a...

    I tried the coke/mentos thing and it works in a pinch when I didn't have any other CO2 sources readily available. I just watched the baking soda/vinegar method and it's equal in concept. But the...
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    Ahh I was nervous on my first burn too... started...

    Ahh I was nervous on my first burn too... started with one firewood open, and two with it closed for a total of about 3 hours. Followed the hobbymelter instructions on backyardmetalcasting.com. Then...
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    Sticky: Looks good! I see you gated it on the thinner...

    Looks good! I see you gated it on the thinner side and skipped the hole.
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    Thanks Jason! I'm quite happy how they turned...

    Thanks Jason! I'm quite happy how they turned out! The whole process actually! I learned quite a few things this past few weeks. I have to say the 3D printing part has given me quite a few options....
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    Ahh I think everyone's confused that I'm having...

    Ahh I think everyone's confused that I'm having issues casting the handles... that's not the issue... the issue was with the split pattern housing that I was casting... I just made those handles to...
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    Maybe it was the sand, but more the angle I was...

    Maybe it was the sand, but more the angle I was pulling it at. The draft angle is at 2.5 degrees, which is quite narrow for me and after 6 times it always parted with issues on the far side from me....
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    Thanks! The handles I casted worked beautifully....

    Thanks! The handles I casted worked beautifully. In my photo you can see the split pattern and the cope now pulls cleanly. I tried it twice, once to test it and the second time to cast it. Both times...
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    Casting my flask handles

    So I just started casting and last week I tried casting a split pattern for the first time and for some reason I just couldn't get a good separation. Every time I lifted the cope, a part of the sand...
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    Just fyi, I bought the cheaper of the two link,...

    Just fyi, I bought the cheaper of the two link, and so far it works well. I can melt aluminum as fast in about 15-20 minutes. I'm surprised at how little propane gas is used actually. I thought...
  16. Thread: Sand in NJ?

    by alcufe
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    Baking soda and vinegar? That's good to know! I...

    Baking soda and vinegar? That's good to know! I can't bake my cores though, the PLA material I use on the 3D printed core tend to deform even at low oven temperatures. I will probably get a paintball...
  17. Thread: Sand in NJ?

    by alcufe
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    So a quick reply, I did get the quikrete fine...

    So a quick reply, I did get the quikrete fine sand, which is probably around 40-60 mesh, then I bought a 50lbs bag of 200mesh silica sand from the Ceramic Supply Inc in Lodi.

    I started out with...
  18. Concur with machinemaker. That's my first thought...

    Concur with machinemaker. That's my first thought when I saw the part. Doesn't seem like the right solution is to cast it, unless you're trying to spare the cost of the material, or you don't have...
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    Very nice! Just curious, what 3D printer and...

    Very nice! Just curious, what 3D printer and slicer did you use? It seemed to have done a very good job printing it! I didn't even see any issues I usually see on my printer when printing with...
  20. Thread: Sand in NJ?

    by alcufe
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    Thanks all! I've been posting all my supplies in...

    Thanks all! I've been posting all my supplies in that construction material thread so hopefully that will help anyone in my area! I've just melted aluminum the first time last weekend and realized...
  21. Thread: Sand in NJ?

    by alcufe
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    Thanks Caster! Yup know that place, it's just a...

    Thanks Caster! Yup know that place, it's just a little out of my way. When I spoke with them their fine sand is only about 60 mesh. The other option is the 200 mesh. I had someone help me buy the...
  22. Thread: Sand in NJ?

    by alcufe
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    Hah.. I just bought some of that... called more...

    Hah.. I just bought some of that... called more than half a dozen places most didn't know anything but 'you want mason sand?'. This place had the Quikrete Fine Sand near me, and another place has...
  23. Thread: Sand in NJ?

    by alcufe
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    Thanks I'll give Lowes a try. I'm dropping by a...

    Thanks I'll give Lowes a try. I'm dropping by a quarry tomorrow on the way to work, but from talking to the guy he doesn't know much about the grading. Then I'll drop by Lowes on the way back. Home...
  24. Thread: Sand in NJ?

    by alcufe
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    Sand in NJ?

    Hi, seems from reading through a lot of posts here that 100 mesh seems to be the right ratio. Does anyone know where you can get it, especially in the central NJ area? I've tried the Sakrete Natural...
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    Just an update, finally built my furnace. The...

    Just an update, finally built my furnace. The burner took 3 weeks to deliver, but it took me 3 weeks to plan and get all the material for the furnace. Totally worth it!

    Building the furnace was...
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