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Type: Posts; User: dian

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  1. Replies
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    casting the block (lets say it round): imagine...

    casting the block (lets say it round):

    imagine a big rotary table, like peter posted. you erect a 100 m hight mold, lets say steel. on top you place four furnaces that can move up and down. they...
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    quoting myself from earlier post: "look at...

    quoting myself from earlier post:

    "look at this or maybe find a better calculator:

    https://www.tribology-abc.com/sub23.htm


    Pa= f*3.142*d*L*Pc

    where f=friction coefficient
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    a serious question: is it possible to cast a...

    a serious question: is it possible to cast a billet of that size and how? how strong would the "mold" have to be?

    (maybe a procedure could be developed similar to casting concrete?)
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    you have to try it. no idea how you want to check...

    you have to try it. no idea how you want to check temperature. i would want 850°c for 20 min., quench in 150°c oil vertically moving it, rinse in cold water for a while or even ice. then temper to...
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    i was thinking of this as well. how is it done?

    i was thinking of this as well. how is it done?
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    so whats the size of the journals and what...

    so whats the size of the journals and what frequency is you coil?
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    actually the boat should be made out of a single...

    actually the boat should be made out of a single aluminum crystal.
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    how would you go about heat treating the shaft?

    how would you go about heat treating the shaft?
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    here its a common thing. nobody seems to have...

    here its a common thing. nobody seems to have problems with it. except the prices are higher.
  10. what is the 3° on the last insert? cratex (or...

    what is the 3° on the last insert?

    cratex (or equivalent) works well for conditioning threads.
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    if you really want to research this, maybe try...

    if you really want to research this, maybe try talking to peter wendlandt @ pewe-tools. no idea how good his english is.
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    maybe 43 hrc would make more sense and trying to...

    maybe 43 hrc would make more sense and trying to have a deep case/through harden done?
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    are you heat treating yourself? maybe look up...

    are you heat treating yourself? maybe look up martempering temperature for the steel.
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    if we are getting into different alloys, axles...

    if we are getting into different alloys, axles are often made out of 1541. apparently it takes bending loads better that 4340.
  15. i bought one of those brushed for about $50 a few...

    i bought one of those brushed for about $50 a few years back and i prefer to use it for vibrating small molds, e.g. when casting filled epoxi parts.
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    looks dangerous.

    looks dangerous.
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    it probably depends on whether they can do it in...

    it probably depends on whether they can do it in vertical position.
  18. Thread: 4340 steel

    by dian
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    Microstructure and mechanical properties of...

    Microstructure and mechanical properties of friction stir processed cast Eglin steel (ES-1) - ScienceDirect

    somehow its messed up, as far as i can see you take 4340, take out nickel, add cr, si...
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    i would stay with what you have. what is the...

    i would stay with what you have. what is the diameter? 1"? 4340T (hardened and tempered) is about 23 hrc. just saying. have it induction hardened and test it with at least double load.

    there are...
  20. Thread: 4340 steel

    by dian
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    it said "c o b a l t".

    it said "c o b a l t".
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    it will deform but not in any relevant way for...

    it will deform but not in any relevant way for this application. in induction hardening you vary the deph of the case by the frequency used. 4340 should through harden, but ductility might be impared...
  22. Thread: 4340 steel

    by dian
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    4340 steel

    i was just reading that nickel and cobalt has been replaced in 4340 steel by tungsten to make the cheaper eglin steel (es-1).

    have you ever "seen" cobalt in 4340?
  23. push buttons on spokes: i hate them on the p50....

    push buttons on spokes: i hate them on the p50. almost break off my thumb every time.
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    yes, they have caused the texas situation.

    yes, they have caused the texas situation.
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    yes, the e and es collets have been replaced in...

    yes, the e and es collets have been replaced in the 80ies, i think. i still have two sets.
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