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Type: Posts; User: kcoffield

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  1. Replies
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    It would need to be a refractory rated for...

    It would need to be a refractory rated for continuous metal contact and/or the surface coated with something the aluminum (presuming that's what it is) would not attack or the surface finish would...
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    What is your source of metal. Is it castings or...

    What is your source of metal. Is it castings or wrought stock?

    Best,
    Kelly
  3. 6” ID by 8” tall is small since my reference...

    6” ID by 8” tall is small since my reference point is my larger furnace which is 14”ID by 34” tall with the electric heating insert installed.

    Your temperature expectations are modest for most...
  4. The Kaowool is easily stabilized with the use of...

    The Kaowool is easily stabilized with the use of rigidizer (colloidal silica). The oven can be made safe from burn and shock hazard. The rest depends primarily on the answers to the questions below....
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    Agreed and would add they tend to fit a little...

    Agreed and would add they tend to fit a little differently hot than cold too.



    My open ring shanks are 1/8" steel and do fine but they have than tee-section construction which helps with...
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    There ya-go invoking Ohm's law. :rolleyes: 4x...

    There ya-go invoking Ohm's law. :rolleyes:

    4x or ~1.4kw would help his cause. FWIW, My electric is 8.4kw. I can melt ~8lb of aluminum in an A10 from cold start in a about 30 minutes with the PiD...
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    Yup in fact you probably wouldn't even need the...

    Yup in fact you probably wouldn't even need the LP tank if you had screen or chicken wire to support the ceramic wool but.....dunno how long the stove top heating element will live at those temps and...
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    My wife says my aim with the crucible is almost...

    My wife says my aim with the crucible is almost as good as my aim at the toilet...

    K
  9. I gather I have a few people scratching their...

    I gather I have a few people scratching their heads on this and I guess I kind of jumped over some important pieces of information. Yes castings tend to be porous and leak especially thin walled...
  10. Your concerns about rubber wheels are probably...

    Your concerns about rubber wheels are probably justified. Iron is a different ball game and in addition to radiant heat even a small spill could cause them to fail.

    My trolley is here.
    ...
  11. What size crucible and what metal will you be...

    What size crucible and what metal will you be casting?

    Best,
    Kelly
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    JP, I did build it many years ago. I posted about...

    JP, I did build it many years ago. I posted about it here:

    http://www.alloyavenue.com/vb/showthread.php?8279-Over-Under-Arm-Router&highlight=arm

    Overarm routers today are few and far between...
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    Just light weight drywall joint compound you get...

    Just light weight drywall joint compound you get at the retail stores. Slightly thinned with water and brushed on and air dried but about any drywall compound will work fine. The right consistency...
  14. It's post treatment for sealing castings. Sand...

    It's post treatment for sealing castings. Sand (but really all thin walled) castings are prone to leakage from porosity, it's usually just a matter of degree. I thicker wall means a longer path and...
  15. Pressure Vacuum Casting Impregnation Rig

    I have a number of fluid and compressed gas parts in the present and future and needed to make an impregnation rig. In past lives impregnation was just SOP for anything that needed to be water or air...
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    Casting Impregnation Rig Insert

    This is an insert for my vacuum impregnating rig. It basically just holds two guide posts for a lowering basket, and a sealed shaft for cranking/lowering the basket while the chamber is at high...
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    ....or is it MPH?

    ....or is it MPH?
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    I did manage to go back and restore the (former...

    I did manage to go back and restore the (former Photobucket) images in this build thread for posterity's sake, so in the off chance anyone would need or want to reference any part of it, it's...
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    Probably just not enough heat but if you have...

    Probably just not enough heat but if you have highly oxidized metal, such as typical with melting cans especially with an oxidizing furnace environment, you may just be experiencing a lot of Al2O3,...
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    The shape of the arm wont make any difference in...

    The shape of the arm wont make any difference in the torque required to drive it for a given wheel and sand orientation. That is determined by the length of the moment arm. However, the position of...
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    Probably easy enough to make a plate to space to...

    Probably easy enough to make a plate to space to wider centerlines so it could be easily adapted across a range of crucibles. How sensible this is just depends on willingness to invest time and fab...
  22. Thread: Supercharger

    by kcoffield
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    251

    Check out about 8:30 of this build. No casting...

    Check out about 8:30 of this build. No casting but plenty of impressive machining and finish work on the injected dry sumped V10. Though it shows a three lobe blower, it doesn't seem to make it onto...
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    Yah-but, if you enjoy doing it and it produces...

    Yah-but, if you enjoy doing it and it produces something useful, does it matter? Keeps ya out of da-bars!

    Best,
    Kelly
  24. Thread: Supercharger

    by kcoffield
    Replies
    7
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    251

    Looks the part....in scale. I might have missed...

    Looks the part....in scale. I might have missed it elsewhere Sandcrab, but cast with hard patterns, conventional bound sand and coring I would presume? Roots type I take it. Can hardly wait to see...
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    Nice score. I have a set of those too. What...

    Nice score. I have a set of those too. What diameter are they? Mine are 12". Wish they were 18" or 24" but those are typically quite pricey. They're good for stacking and testing mesh distribution...
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