Re: [Emc-users] Mist Cooler

[Ken Strauss]

My comment/question was based on the eBay description. I bought a similar
unit and it *DID* come with an 8mm fitting as advertised. I need to get
around to swapping it with a proper 1/4-inch connection.

> -Original Message-
> From: John Dammeyer [mailto:jo...@autoartisans.com]
> Sent: Tuesday, April 02, 2019 9:15 PM
> To: 'Enhanced Machine Controller (EMC)'
> Subject: Re: [Emc-users] Mist Cooler
>
> > From: Ken Strauss [mailto:ken.stra...@gmail.com]
> > I have one of those also. Where did you find 8mm air line?
>
> Mine came with a standard 1/4" fitting so I put fast attach coupler on it
for
> testing.  Then went  outside the shop with a container of water and used
the
> tire pressure hose that has a regulator on it.  I played around with
pressure
> and flow.  Below about 50 PSI it wouldn't pull the water up the full
length of
> the tubing.  Above 50PSI it didn't have any trouble.
>
> Since the liquid supply tube runs all the way up and mixes at the nozzle
I'm not
> sure where the venturi is and I've not pulled it further apart than just
seeing
> what the tip was like.
>
> As we discussed before, the biggest issue with one of these will be how
fine a
> particulate is created and how much stays suspended in the air.  That's
> probably the biggest reason for having a valve on the fluid side of
things.
> Cooling mostly with air and hardly any fluid.
>
> And this is going to turn into one of these eventually projects.  Just
milled a
> couple of brackets to size using WD-40.  Haven't even figured out where
I'll
> mount this.
>
> John
>
>
>
>
>
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Re: [Emc-users] Mist Cooler

[John Dammeyer]

> From: Ken Strauss [mailto:ken.stra...@gmail.com]
> I have one of those also. Where did you find 8mm air line?

Mine came with a standard 1/4" fitting so I put fast attach coupler on it for 
testing.  Then went  outside the shop with a container of water and used the 
tire pressure hose that has a regulator on it.  I played around with pressure 
and flow.  Below about 50 PSI it wouldn't pull the water up the full length of 
the tubing.  Above 50PSI it didn't have any trouble.   

Since the liquid supply tube runs all the way up and mixes at the nozzle I'm 
not sure where the venturi is and I've not pulled it further apart than just 
seeing what the tip was like.  

As we discussed before, the biggest issue with one of these will be how fine a 
particulate is created and how much stays suspended in the air.  That's 
probably the biggest reason for having a valve on the fluid side of things.  
Cooling mostly with air and hardly any fluid.

And this is going to turn into one of these eventually projects.  Just milled a 
couple of brackets to size using WD-40.  Haven't even figured out where I'll 
mount this.

John





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Re: [Emc-users] Mist Cooler

[Ken Strauss]

I have one of those also. Where did you find 8mm air line?

> -Original Message-
> From: John Dammeyer [mailto:jo...@autoartisans.com]
> Sent: Tuesday, April 02, 2019 6:37 PM
> To: 'Enhanced Machine Controller (EMC)'
> Subject: [Emc-users] Mist Cooler
>
> This just arrived.  Nice piece of kit for the money.
> https://www.ebay.ca/itm/132111789751
>
> It will require a valve on the fluid side.
>
> Now to try and figure out what kind of coolant to use.
>
> John
>
>
>
>
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[Emc-users] Mist Cooler

[John Dammeyer]

This just arrived.  Nice piece of kit for the money.
https://www.ebay.ca/itm/132111789751

It will require a valve on the fluid side. 

Now to try and figure out what kind of coolant to use.

John




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Re: [Emc-users] Radio station stories -- Was RE: Posting order

[Gene Heskett]

On Tuesday 02 April 2019 11:11:13 Jon Elson wrote:

> On 04/02/2019 03:25 AM, Gene Heskett wrote:
> > The powerstat was losing contact at the slip ring. I put
> > the circuit in straight thru connection and took the stat
> > out and apart to find that ring burnt to ashes. A sliding
> > contact, on alu? Boggles the mind.
>
> A sliding ELECTRICAL POWER contact on aluminum??!!??  Yes,
> boggles my mind, too!
> Maybe it would work on a manually-controlled dimmer, but not
> an automatically-adjusted one.
>
The frying sound accompanied by the jerking as you were breaking the 
microwelds that would be the actual contact as you turned it by hand 
when it was under power would have rang all the alarm klaxons in my 
mind.

> > I told the guy who specced that transformer off explaining
> > in great, but vulgar detail exactly what was wrong with
> > his education.
>
> Well, it probably wasn't Harris' fault, they bought an
> off-the-shelf powerstat and expected Superior Electric knew
> how to build them. Obviously, NOT!
>
> Jon
>
I don't recall now, but I don't think that POS ever saw a Superior 
assembly line.  I have a couple samples of their stuff and some chinese 
versions all of which are made better that that was. It was NOT up to 
their quality level on several fronts. The clock motor driving it had a 
Cramer stamp on it, but I don't recall if there was a stamp on anything 
in the stat itself.

You know me well enough, Jon, to know I'm a sloppy working perfectionist.  
An oxymoron but call it what it is.  That, nearly 40 years later, still 
upsets me. If I was to find it again, I'm likely NOT mellowed enough to 
keep me from calling him and asking which of his mothers legs the best 
part of him ran down.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 



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Re: [Emc-users] Radio station stories -- Was RE: Posting order

[Jon Elson]

On 04/02/2019 03:25 AM, Gene Heskett wrote:
The powerstat was losing contact at the slip ring. I put 
the circuit in straight thru connection and took the stat 
out and apart to find that ring burnt to ashes. A sliding 
contact, on alu? Boggles the mind. 
A sliding ELECTRICAL POWER contact on aluminum??!!??  Yes, 
boggles my mind, too!
Maybe it would work on a manually-controlled dimmer, but not 
an automatically-adjusted one.


I told the guy who specced that transformer off explaining 
in great, but vulgar detail exactly what was wrong with 
his education.
Well, it probably wasn't Harris' fault, they bought an 
off-the-shelf powerstat and expected Superior Electric knew 
how to build them. Obviously, NOT!


Jon


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Re: [Emc-users] Radio station stories -- Was RE: Posting order

[Gene Heskett]

On Monday 01 April 2019 22:16:11 Jon Elson wrote:

> On 04/01/2019 11:27 AM, Gene Heskett wrote:
> > I'd have done the same, except I'd have added a flyback diode across
> > the solenoid to absorb the shutoff pulse from the solenoid. Perhaps
> > with a small r in series to absorb more of the stored energy in the
> > R.
>
> I'm pretty sure the diode must have been there, or it would
> have only operated ONE time!

But thats assuming it was a fast switch too, Jon. Many times the response 
of the cell to the flame can be measured in seconds, and that would be a 
pretty slow switch. But I'd like to CMA with the diode anyway.  Belt and 
suspenders approach. :)
 
> >> Since this was in a safety system, I was a bit hesitant to
> >> be so bold with this change, but, my circuit WORKED, the
> >> original required frequent tweaking, maybe as room
> >> temperature changed or like voltage changed.
> >
> > Actually, it seems like you did exactly what a good designer should
> > have done in the first place.
>
> Yup, that's what I thought, too.
>
> Jon

And yet, I have been plumb amazed at the stupidity exhibited in the 
finished product. Harris MW1A transmitter, designed for the 1 kw 
daytimers. Teeny little 100 watt motorised powerstat designed to be an 
automatic voltage regulator, run by a geared down electric clock motor. 
Stator contact, the ring the armature contacted, made out of aluminum by 
stamping. Took me a year of running the 3 miles out to the site because 
it was off the air, and finding it back on the air when I got there. 
Finally I decided to sit down in a chair and wait it out. Took most of 2 
hours. The powerstat was losing contact at the slip ring.  I put the 
circuit in straight thru connection and took the stat out and apart to 
find that ring burnt to ashes. A sliding contact, on alu? Boggles the 
mind. Even with a slather of deoxit on it is not going to work 
dependably, ever and certainly not for a year.  I ordered a new stat 
from Harris as thats the only way I could get a pristine pattern, went 
to the scrap yard and got some sheet brass, and made a brass version to 
put in the new stat. AFAIK, its still working, maybe. If the whole 
transmitter hasn't been replaced in the ensuing time from '82 till now.

It was Harris's first transistorized transmitter, and used the poorest 
transistors that would still do the job and the failure rate was pretty 
high when the stick it was driving had no coils across the eggs in the 
guy wires and was the tallest thing for a mile around in lightning 
country.

Driver transistor failed, I went to the shack and got a cb radio final in 
a to-202 package.  Only had about 10x the gain of the one Harris used, 
put it in and instantly made a 1600 watt transmitter out of it. Took 
half an hour detuning it to get it down to a kilowatt. And it did it on 
less amps into the finals, increasing the transmitters efficiency by 
around 10%. Typical, and I think that and the transformer debacle 
explains why Harris is no more. I told the guy who specced that 
transformer off explaining in great, but vulgar detail exactly what was 
wrong with his education.

War stories. Been there, done that.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 



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