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  1. Replies
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    The specs say the leakage current is

    The specs say the leakage current is <2mA but the FAQs say higher capacity relays have more leakage, up to 30mA.

    Will consider addition of bleed off resistors. Thanks for your reply

    Best,
    Kelly
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    I have identical parallel circuits with SSRs and...

    I have identical parallel circuits with SSRs and neither exhibited it initially. Somewhere along the way one did and consistently does now and for the first time the other did but doesn't do so...
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    Thanks Jay. I did a little web surfing and found...

    Thanks Jay. I did a little web surfing and found some others that had similar remarks. I didn't know that. I'll act accordingly.

    Best,
    Kelly
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    Solid State Relay - Voltage

    Anyone ever had an SSR leak voltage when not energized? I've noticed a very low level of illumination on an LED indicator light I have on my heating element circuit, so I put meter on it and sure...
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    Looks pretty good. How do they seem to be...

    Looks pretty good. How do they seem to be strength wise? Is that the chemically catalyzed or CO2 gassed SS? You might want to cook one to ~1300F or so and see if it's water soluble afterwards. If you...
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    Winnowing is just sprinkling sand from a cup in...

    Winnowing is just sprinkling sand from a cup in front of a fan and letting it blow forward onto a tarp. The fines travel further. It's free for you and probably less total time invested. Bentonite...
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    You live in Tucson and can't find sand?...

    You live in Tucson and can't find sand? :rolleyes:

    Grab some desert sand and winnow it with a fan over a tarp like Bonz suggested. The fines will be the farthest from the fan.

    Best,
    Kelly
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    Pete, It's hydrostatic and function of metal...

    Pete, It's hydrostatic and function of metal density, sprue height, total mold area. This is true while molten. Once things freeze there's no pressure.

    Sandcrab nailed it but there are some other...
  9. Thread: sand binders

    by kcoffield
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    Mold materials and molten metal conditioning are...

    Mold materials and molten metal conditioning are two of the things I wish I would have paid closer attention to over the years and the time I spent in my friend's foundry. On their air-set line they...
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    When saying "catalyzed" does he mean with Esters...

    When saying "catalyzed" does he mean with Esters or merely CO2 gassing N grade or so SS? Don't think the former will break down in water. The latter may dissolve ok depending on SS grade and amount...
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    Adding a small amount of bleach in the...

    Adding a small amount of bleach in the water....5-10% would probably do it. Never heard of wheat flour in green sand. Wood flour yes for facing sand. Anything organic will likely grow mold in pretty...
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    No..........

    No..........
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    If you decide to go that route with no draft...

    If you decide to go that route with no draft you'll want to have the right compromise of catalyst and binder because they might be a bugger to shake out if not.

    Best,
    K
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    It'll still may be difficult to pack the thin...

    It'll still may be difficult to pack the thin deep core mold. They'll be fragile and may create some tolerance issues with how they stack and are captured in the mold. Wont you have to have multiple...
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    On my build list too. Take care Bonz, K

    On my build list too.

    Take care Bonz,
    K
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    Yes, picture is visible now. How energetic are...

    Yes, picture is visible now. How energetic are the waterbed vibrators? I had Cleveland's biggest electric unit I picked up cheap off of eBay on my vibe table and LF rig and swapped it for one of the...
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    Cant see the photo Bonz K

    Cant see the photo Bonz

    K
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    That's the norm for those small hobby mullers....

    That's the norm for those small hobby mullers. There are also two MiniMites auctions and though they are a competing brand they are virtually identical mechanically. The mulling wheel is spring...
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    I did acquire some nix stix from a forum member...

    I did acquire some nix stix from a forum member and over the course of a few weeks it evaporated from the plastic bottle it was stored in. What was left was graphite powder. From smell, I'd say nix...
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    Good progress on the cores. How are they held in...

    Good progress on the cores. How are they held in place in the mold? Do they include core prints. Besides release agent, a good finish on the fins will help a bunch but also be susceptible to...
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    I think you pretty much summed it up. The...

    I think you pretty much summed it up. The required power supply is inherently expensive and adjustment required with the changing inductive load makes controlling it complex. Even with carbon...
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    Certainly a useful rig even without CNC. Based...

    Certainly a useful rig even without CNC. Based upon how/where you have the guide rails positioned I presume you intend to use it as a hand guided pantograph with the pattern positioned on the right...
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    Gotta call that a win. Nice job Petee. Best,...

    Gotta call that a win. Nice job Petee.

    Best,
    Kelly
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    Ok, I was just trying to get an idea of your...

    Ok, I was just trying to get an idea of your starting point. If you have the equipment to mold and pour 20lbs of aluminum and casting experience, I think the challenge of that part will be the...
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    Are you an experienced foundryman with home or...

    Are you an experienced foundryman with home or other foundry equipment?

    Best,
    K
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