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Thread: Lead thermometer

  1. #1
    Member Tommy's Avatar
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    Lead thermometer

    I'm after a lead thermometer for use with my Lee bottom pour and for ingot making from scrap lead (over a gas ring), and I'm looking for suggestions/options.

    Need to keep an eye on temp for being able to repeat results when casting, and to avoid approaching zinc melting temp (when I melt down scrap I get quite a bit of zinc wheel weights. I know there are ways of sorting them, but I can't be fucked, and just floating them off the top seems easiest. Accidently going too high with the lpg ring is too easy, and having realtime temp reading will make this easier).

    I had considered a high temp thermocouple like https://www.jaycar.co.nz/k-type-thermocouple/p/QM1282 for use with my home or work multimeter, but I dunno if it will stand up to an hour or two of use at a time. Cheap enough to just try and see, but if someone pipes and says " Yeah nah fuck that", that's a bit of time and coin saved init?

    One of those long probed thermometers with the disc shaped dial at the top seems to be the go, but I can only seem to find them in lower temp ranges, ie for cooking etc.

    What do you fellahs use?
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  2. #2
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    You could try an infrared/laser pointing thermo?

  3. #3
    Member Tommy's Avatar
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    Quote Originally Posted by inglishill View Post
    You could try an infrared/laser pointing thermo?
    Yes, possible, but with both hands busy when casting, it'd nice to have a constant readout
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  4. #4
    Member zimmer's Avatar
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    A type J would probably do the job. Type K easier to source probably. You just need a suitable thermocouple pocket to hold it.

    Optically with hand held may struggle with the varying emissivity of the molten surface i.e. sometimes clean after fluxing, sometime skummed over with doss.

    Depends on how accurate you wish to measure.

    The main thing is to avoid getting to 900 deg F/482 deg C.

    I used to be pretty slack when casting, usually overheating to hell. Also a bit slack with good ventilation. Still alive though.

    Just looked thru my Lyman book – thought there might have been a pic of a suitable thermometer there.

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  6. #6
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    With out googling, what's the issue if you get zinc melted in?
    Please excuse spelling, as finger speed is sometimes behind brain spped........ Or maybe the other wayy.....

  7. #7
    Member Tommy's Avatar
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    Quote Originally Posted by Beaker View Post
    With out googling, what's the issue if you get zinc melted in?
    A big mess and fucks your pot
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  8. #8
    Member Tommy's Avatar
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    Yep that looks the go, although NZ$67 + freight owie
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  9. #9
    SiB
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    Also remember that zinc fumes will def have you puking your guts out. Ask any welder who's welded galvanised material.

  10. #10
    northdude
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    just stick your figure in it to see if its melted

  11. #11
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    Quote Originally Posted by northdude View Post
    just stick your figure in it to see if its melted
    If it hurts it's hot!!
    We used to drink milk to soak up galv fumes!
    Boom, cough,cough,cough

  12. #12
    Member Tommy's Avatar
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    Quote Originally Posted by SiB View Post
    Also remember that zinc fumes will def have you puking your guts out. Ask any welder who's welded galvanised material.
    Been there done that got half a tshirt
    veitnamcam likes this.
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  13. #13
    P38
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    Last edited by P38; 25-05-2017 at 07:54 PM.
    Arguing with an Engineer is like Wrestling a Pig in Mud.

    After awhile you realise the Pig loves it.

  14. #14
    Member Tommy's Avatar
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    Out-fucken-standing!

    Just ordered one
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  15. #15
    P38
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    Quote Originally Posted by Tommy View Post
    Out-fucken-standing!

    Just ordered one
    no worries

    Cheers
    Pete
    Arguing with an Engineer is like Wrestling a Pig in Mud.

    After awhile you realise the Pig loves it.

 

 

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