Re: Re: Variable low Temp disposable Cautery

From: Tapio Linkosalo <tapio.linkosalo_at_iki.fi>
Date: Wed, 30 May 2012 20:20:03 +0300

On 30.5.2012 17:01, ray_harlan wrote:
> I have used a number of different makes of cauteries and have always
> found that reducing the number of batteries from two to one makes a good
> film cutter. Shortening and rebending the flat brass strip found inside
> to connect one cell is easy. Leave the other cell in place to take up space.

I measured the tip I have, and it had about 1 ohm resistance (maybe 0.9,
but my multimeter is not that accurate...). With one cell battery _at_ 1.5
volts that would mean 1.5 amps current, and about 2 watts of power.

But, I think you cannot get 1.5 amps short circuit current from a
drycell, a it has too high internal resistance. So, are you supposed to
use drycells with the cautery, and with a battery (NiCad or NiMh) you
would get too much power and too hot a tip? Or is 2W rather the proper
power, and with drycells the cautery does not warm enough?



-Tapio-
Received on Wed May 30 2012 - 10:20:10 CEST