[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [BULK] Re: [TCML] copper tube stationary gap - was: NST rebuild good
The bevel sounds like a good idea to me. Anything that will help focus
the airflow in and around the electrodes is a plus. Back when I tried
the brass stock, I used apparatus to similarly focus the airflow over
the brass. But without success. The brass would work fine for a while,
but the thermal rise could not be stopped and once it was up to temp, no
amount of airflow helped (sparks fizzled out). This wasn't due to the
material itself but the fact that it was solid stock. It took longer to
heat up but impossible to cool down unless I ran really low power. I had
similar issues with small 1/2" copper tubing. With large enough pipe
stock and external cooling, a relatively cool thermal balance could be
reached even at high power.
I've been meaning to epoxy a thermal probe on one of the electrodes to
gather temperature data for power input and of course performance. It
probably wouldn't be that difficult to calculate needed cfm for a given
electrode shape and size for power at the gap (at least based on a
common configuration). I think most of us still use the trial and error
Let us know how the new gap works out.
Jim Mora wrote:
My 8" coil used a single gap of 1" brass dowels on threads (easy adjustment
and cleaning) ( somewhat obscure RQ) blown by a powerful leaf blower coupled
to a 12" long 3" to .5 inch nozzle. It quenched a 15KV/120ma very well.
Since I have acquired a 14400/5KVA PT (GE), it is torn down for a rotary
I am going to experiment with a static gap much like Bart's which will be
blown by a pair of side x side pancake blowers (a lot of air). To focus the
air across the bottom, assuming it will rise just fine, I cut a 45 degree on
the face of the phenolic which is tapped and threaded to except the copper
tubes. The clincher is, I beveled the top edge to create a Bernoulli effect
and the air stays exceptionally well focused across the tubes mounting
surface rather than traveling up and away before it reaches the length of
the tubes. I'll post results when it runs.
Tesla mailing list