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  1. Replies
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    If the purpose of the shellac is just surfactant,...

    If the purpose of the shellac is just surfactant, Rasper has suggested thinned Ethylene or Propylene Glycol. I've used shellac for glue and have tried as surface finish but in lost foam with aluminum...
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    These comments are more from the pattern makers...

    These comments are more from the pattern makers perspective but I had a three decade relationship with a friend that owned a foundry that did virtually all my castings for me. More recently when the...
  3. If you don't need precise positioning a spring on...

    If you don't need precise positioning a spring on the end of your plunger will provide more over travel protection for your limit switches. Of course many limit switches already have large over...
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    I just meant is it the existing '41 windshield?...

    I just meant is it the existing '41 windshield? Cut/modified from another existing windshield? A custom one-off safety glass or polycarbonate?

    Best,
    Kelly
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    I don't know about that combo. I experimented...

    I don't know about that combo. I experimented with a mullite/bentonite coating, and several other PoP and gypsum based coatings. They all produced finishes equal to the pattern quality but were not...
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    That's why I asked the question. A thinned layer...

    That's why I asked the question. A thinned layer of drywall mud produces a surface finish equal to that of the foam surface....better prep, better finish and the quality of finish possible on the...
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    Based upon the curvature and how it fairs with...

    Based upon the curvature and how it fairs with the car sheet metal, I don't think a couple sections would cut it. As Bob mentioned, 5 or 6 is more likely in order to maintain not only where it fairs...
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    Is that a recommendation in the context of the...

    Is that a recommendation in the context of the entire thread or just FrostOak's post #187?

    Best,
    Kelly
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    That can be more a matter of who's hands are...

    That can be more a matter of who's hands are doing it be it the fab or the pattern making and whether your paying or playing. Is that an original part sitting on the car or a fabricated pattern? A...
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    Believe it. If you look up the coefficient of...

    Believe it. If you look up the coefficient of linear thermal expansion for aluminum you will get between 12 to 13 microstrain or ~13x10^-6 inches/inch/F. So if you get ~1100F cooling from...
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    Density of wood (especially pines and furs)...

    Density of wood (especially pines and furs) varies and is also highly dependent upon moisture content. White pine is listed as 22-31 lb/ft3 whereas aluminum 167 lb/ft3. So somewhere between 5.4x and...
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    Good clean looking part. Good job. After...

    Good clean looking part. Good job.



    After casting so many of them now, you'd think I'd be over it but I must say, the stability of the inner core sand is remarkable and still sort of freaks me...
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    It certainly does. I thought they were cast as a...

    It certainly does. I thought they were cast as a single piece not split pairs.

    Best,
    Kelly
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    Very nice work. One curiosity question. Apologies...

    Very nice work. One curiosity question. Apologies if posted elsewhere and not sure if these will be CO2/SS, air set, or green sand cores, but how do you invest the cores? Fill the two halves, glue,...
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    Looks very nice. Best, Kelly

    Looks very nice.

    Best,
    Kelly
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    I think you'll have good results. The white glue...

    I think you'll have good results. The white glue I have used burned out very clean. Only complaint, if you don't get it applied just the right thickness it tends to ooze out and need some clean up...
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    Looks good. Cant see the close up of the bead on...

    Looks good. Cant see the close up of the bead on the hose barbs but they look good from the picture. How did you place and glue them?

    Best,
    Kelly
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    Probably most tolerant but was a bit unusual to...

    Probably most tolerant but was a bit unusual to see the Tuyere diameter spec'd larger than the vent. The picture made the Tuyere look even larger.....thus my question.



    Well 2 1/2" is about 4.9...
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    This whole thread is a must read but regarding...

    This whole thread is a must read but regarding furnace design, scroll down to 'Rules of Thumb" at the link below.
    ...
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    That would explain the difference in vs out of...

    That would explain the difference in vs out of furnace and the absence of color in video footage. I'll need to do a night pour some time and pay closer attention on future pours. I've just been...
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    I didn't ask for your intended fuel source but...

    I didn't ask for your intended fuel source but vent may be a bit on the smallish side for a naturally aspirated propane burner and most likely so for any oil burner. -Always ways to overcome.
    ...
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    OCD, what is the diameter of the Tuyere and vent...

    OCD, what is the diameter of the Tuyere and vent hole in the lid?

    Best,
    Kelly
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    No casting this weekend. Did some fabrication and...

    No casting this weekend. Did some fabrication and pattern work though.

    I went back and looked at my other pour videos and none of them exhibit any crucible color by the time I am handling and...
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    Thus far, I have not degassed at all, only light...

    Thus far, I have not degassed at all, only light flux with NaCL/KCl eutectic. I have had the luxury of starting with very clean 356 that began only one pour from commercial ingot but through all my...
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    It's a good observation and question but I'm...

    It's a good observation and question but I'm thinking probably within within 50F absolute. I'm only as sure as my instrumentation indicates. I mentioned earlier in the thread that in air, I had a 50F...
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