nichrome wire insulation

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.

Barry

Certainly not you, ya' braindead idiot!

: :> 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.

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

Cheers, Tom

^ That's apparently the end view.

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

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

-- Mike --

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

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

You'd be barking mad, too if you were raised by Dingos.

As seen on

D from BC British Columbia Canada.

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 --

:John Larkin wrote: :> :> No point in apologizing to Phyllis. He's mad at the world. :> :> Or maybe just mad. : : : You'd be barking mad, too if you were raised by Dingos.

Don't insult the dingoes - they are smarter than you think and would probably abandon him in the middle of the Simpson Desert :-)

You named a desert after a US cartoon character?

John

They keep saying the same thing about him on news:aus.electronics so blame them.