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nichrome wire insulation

Discussion in 'Electronic Design' started by [email protected], Feb 16, 2008.

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  1. Guest

    no, I need the temp of the heating element be no higher than ~50C.

    Phil, would please leave the subject line alone, eh?
  2. D from BC

    D from BC Guest

    An insane idea would be to solder together lots chip resistors to make
    a pipe 3D structure with the max surface area. Each resistor can
    contribute a little heat.
    Would be fun to see. Send a picture if you do :)

    / // / /
    _/ _//_/ / /
    / \/ \/ \/ /
    \_/\_/\_/ /
    / \/ \/ \/

    D from BC
    British Columbia
  3. Dave Platt

    Dave Platt Guest

    You might look for "water glass". It's a silicon compound (???) that's
    Sodium silicate.

    I suspect that it might be a bit too brittle to use in this
    application, though, if long-term reliability is a concern.
  4. Jim Flanagan

    Jim Flanagan Guest

    Why, oh why does this guy continue to exist on this group? He speaks of
    newsgroup etiquette, but he totally ignores common courtesy.
  5. Jim Thompson

    Jim Thompson Guest

    He only exists if you reply to his posts. Killfile him and ignore
    anyone who responds to him... ostracize him from the group.

    ...Jim Thompson
  6. Fred Bloggs

    Fred Bloggs Guest

    FU and your damned courtesy, ya' friggin fruit. Phil is very helpful at
    times and not nearly the disruption as some idiots with their weather
    reports and assorted OT threads invariably comprised of braindead
    content, or their whining about courtesy for example.
  7. John Fields

    John Fields Guest

  8. John Larkin

    John Larkin Guest

    Fred and Phyllis are soul mates.

  9. Jim Flanagan

    Jim Flanagan Guest

    Oh my, there is more than one!? Who would have thought? Guess I'll add
    another to my kill file list. Thanks for pointing yourself out.
  10. Barry Lennox

    Barry Lennox Guest

    I made a similar device a number of years ago, and simply clamped
    about 8 x 10watt WW resistors (the "sand/cement" square types, with
    thermal grease) between two heat sinks. At one end I mounted a 5"
    muffin fan. It all worked very well, and can see no reason why it
    should not scale nicely to about 200-300 W

    Nichrome wire is a PITA to fiddle with.

  11. Fred Bloggs

    Fred Bloggs Guest

    Certainly not you, ya' braindead idiot!
  12. Ross Herbert

    Ross Herbert Guest

    On Sat, 16 Feb 2008 15:03:47 -0800 (PST), wrote:

    :> Why use a heat sink? The nichrome will heat air all by itself.
    :> John
    :It will, but I wanted to increase the surface contact area.

    The best way to obtain "insulated" nichrome wire is to buy resistors with it in.

    It would be far simpler and more effective to mount a string of series or
    series-parallel heat sink mount resistors than to try to attach insulated
    nichrome wire to a heatsink.
  13. Tom Bruhns

    Tom Bruhns Guest

    OK, there's some sense to that, and a heatsink is a reasonable way to
    spread the heat over a large area. Especially if you already have the
    heatsink, it would probably be easiest to just mount some resistors to
    it. As I mentioned before, Caddock make some nice ones that mount
    just like power semiconductors, using a single mounting hole. You can
    probably find some surplus resistors of the sort in a finned aluminum
    housing that will mount easily to a heat sink using two holes: e.g.,
    ebay item 160205759878. You can sometimes find stuff at surplus
    places like e.g. the immersion heating element under
    the "heating and cooling devices" tab that could be useful. In any
    event, using parts like this would be MUCH easier than trying to mount
    nichrome wire to a heatsink. You CAN get insulated resistance wire,
    but it's probably going to be expensive and will certainly be messy to
    deal with.

  14. Mike

    Mike Guest

    ^ That's apparently the end view.

    Here's the side view: ---------------------

    The insulation is perforated, of course, to allow better heat transfer.

    -- Mike --
  15. Jim Thompson

    Jim Thompson Guest

    Most hair dryers simply wind bare Nichrome on a mica form.

    ...Jim Thompson
  16. D from BC

    D from BC Guest

  17. Mike

    Mike Guest

    Okay, okay... striiiiiiip... striiiiiiip. Alright, here's the new side
    view: _________________

    You'll recognize immediately that this is uninsulated nichrome, and it's
    ready for use. Simply print this page, cut out the wire, wrap around the
    mica form of your choice, and crimp to the electrical connection at both
    ends. If you need more wire, print the page twice and staple the wire
    sections together.

    -- Mike --
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