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    Hope you stick with us after the casting. Many...

    Hope you stick with us after the casting. Many of us are car guys as well. If you can get a pick of the mold though, that would be great!
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    This is the concern i have with this particular...

    This is the concern i have with this particular casting. It is a very long casting and will continue to contract long after the risers stop feeding. The frame does have a pretty thick cross section...
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    unfortunately the metal is still contracting...

    unfortunately the metal is still contracting after it has cooled to where it can no longer draw from the risers. Thats the point when hot tares can occur.
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    Any ETA on a pour date?

    Any ETA on a pour date?
  5. Thread: Beginner build

    by DavidF
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    Then consider building 2 furnaces, one small for...

    Then consider building 2 furnaces, one small for an A-6 to A-10, and a larger one for A-20 plus. With those larger crucibles you will want an extra set of hands around, smaller you can safely handle...
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    Watch this video. it shows how the mold is...

    Watch this video. it shows how the mold is prepared. No hard ramming or jolt squeeze like in green sand casting.

    http://youtu.be/4TEZE1zn7aY
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    You can add in a void into the mold to thin down...

    You can add in a void into the mold to thin down the inner wall so that the mold can collapse in more easily. Also keep in mind that the heat of the melt will break down some of the binder as well.
    ...
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    Same dimensional tolerances, just does not...

    Same dimensional tolerances, just does not require the molding pressure green sand does. The metal shrink rate is consistent dependent on the alloy. If the metal can not break down the mold as it...
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    Trying to get back on the mill conversion. My...

    Trying to get back on the mill conversion. My work and small side jobs casting have really taken a toll on my free time to get things done. I hate to be selfish, but think I need to be so i can...
  10. Thread: Beginner build

    by DavidF
    Replies
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    190

    Figure out what you want to cast first, then how...

    Figure out what you want to cast first, then how large a crucible you will need to hold that size melt. Once you know this you can design your furnace around the crucible size. A 55 gallon drum will...
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    Nothing wrong with resin bonded sand provided you...

    Nothing wrong with resin bonded sand provided you have the proper draft. Pretty much standard commercial foundry stuff now a days.... I think its chocolate cake time.. :)
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    I was under the impression that steel could not...

    I was under the impression that steel could not be produced from a oil burning foundry as it rapidly absorbs carbon from the atmosphere turning steel into iron??
  13. What size flask?? The tech sheet will list the...

    What size flask??
    The tech sheet will list the burn out schedule according to flask size. Casting flask temp is a whole different world, and low flask temps typically produce better finishes, but...
  14. I use the R&R ultravest for aluminum and it works...

    I use the R&R ultravest for aluminum and it works out just fine with vacuum assist. The 400 series is a bit more porous but I dont think it would make any difference unless you are gravity casting. ...
  15. Thread: Fat Tire Bike

    by DavidF
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    918

    When I used to fix propeller shafts I would drill...

    When I used to fix propeller shafts I would drill and tap both pieces, then put a threaded stud in and screw the two parts together and finish up by tig welding the outside that was chamfered back to...
  16. Thread: Fat Tire Bike

    by DavidF
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    918

    No, thats new to me. Very futuristic. I was...

    No, thats new to me. Very futuristic. I was thinking more like this...
    http://youtu.be/9rIIJbDkpN8
    http://youtu.be/9rIIJbDkpN8
  17. Thread: Fat Tire Bike

    by DavidF
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    Once again in my laziness...... "Electric...

    Once again in my laziness...... "Electric motor!!"
    And you need to mow your grass... Wow, thats grass too...I only have weeds to mow down :(
  18. Thread: Fat Tire Bike

    by DavidF
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    Im thinking slap an electric motor on that baby!!

    Im thinking slap an electric motor on that baby!!
  19. I dont baby sit it, i have a digital temp...

    I dont baby sit it, i have a digital temp controller on mine. But yes burn out is pretty critical.
  20. Sprue wax is cheap!

    Sprue wax is cheap!
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    Forge and furnace?

    There is a forge and furnace taking up space in a local shop that needs to finds a new home. I dont know much about them and have not seen them myself. The forge is gas powered and the furnace is...
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    Nice work Kelly, they just keep getting better...

    Nice work Kelly, they just keep getting better and better. Im getting ready to head out for a short vacation and will be making my attempt when i get back..
  23. couple things i see. Looks like incomplete burn...

    couple things i see. Looks like incomplete burn out for starters, but the main thing is the sprue size is way way to big. The flask temp should be at 500f for the pour, this is especially important...
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    Sticky: I bought whats called pinion wire and turned it...

    I bought whats called pinion wire and turned it to make the shafts. https://www.mcmaster.com/#standard-gears/=17tbc0b
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    Sticky: working on making a hydraulic pump for my rov...

    working on making a hydraulic pump for my rov project. Maybe someday I will actually build the thing....LOL
    http://i1102.photobucket.com/albums/g446/davidflowers1/20170527_152617.jpg...
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