Re: [Emc-users] Postman semi-good to me today

2019-02-15 Thread Gene Heskett 
On Friday 15 February 2019 22:08:51 Jon Elson wrote:

> On 02/15/2019 04:36 PM, Gene Heskett wrote:
> > He brought me a new mirror insert for the ditch side mirror
> > i wiped out Monday, fit perfectly.
> >
> > And the solenoid air valve. Purty, chrome plated, and has a coil R
> > of about 2.1 ohms, no way I can switch that much 12 volts with a
> > Mesa 7i76D. So that will take a booster relay, which I have.
>
> You sure that isn't an AC valve? 

The only way that could be efficient is if the train accessories ran on 
400 hz power. It said train horns in the propaganda. And I'm not a 
modern train buff, so I've no idea what the train stuff runs on. For all 
I know, there is a different system, idependent of the traction motor 
setup to run everything else. 

> 2.1 Ohms would draw 5.7 A 
> at 12 V, and 69 W power dissipation.  Can't possibly
> tolerate that for more than a few seconds!  Maybe that is
> desired for an air horn valve, but it will never work for
> coolant control.  Maybe you can use an R-C scheme to cut
> applied voltage after giving time for the valve to open.

Not worth the cost of the experiment. I've even got a set of air horns, 
ran them on my rice burners in years past to wake up sleeping cage 
drivers,  but they also have their own compressor, started by the horn 
button.  Hard on the bikes battery though if you lean on it for 10 
seconds. Compressor cables are about 8 ga, and hard to find a 
serviceable pushbutton with contacts good enough to last 10+ uses, often 
welding the contacts shut till you bang it again, but they do wake up 
the surrounding drivers who often don't pay any attention to anything 
less than a greyhound painted on the side of a bus, or in this country, 
a coal truck running at their normal weight of about 220k lbs. Some of 
the best drivers on the planet, they are fully aware of the limits 
imposed by that much weight in the rear view mirrors.  Saved my butt 
several times while logging close to half a million on two wheels.

> Jon
>
>
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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] Postman semi-good to me today

2019-02-15 Thread Jon Elson 

On 02/15/2019 04:36 PM, Gene Heskett wrote:

He brought me a new mirror insert for the ditch side mirror
i wiped out Monday, fit perfectly.

And the solenoid air valve. Purty, chrome plated, and has a coil R of
about 2.1 ohms, no way I can switch that much 12 volts with a Mesa
7i76D. So that will take a booster relay, which I have.
You sure that isn't an AC valve?  2.1 Ohms would draw 5.7 A 
at 12 V, and 69 W power dissipation.  Can't possibly 
tolerate that for more than a few seconds!  Maybe that is 
desired for an air horn valve, but it will never work for 
coolant control.  Maybe you can use an R-C scheme to cut 
applied voltage after giving time for the valve to open.


Jon


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Re: [Emc-users] Postman semi-good to me today

2019-02-15 Thread Bruce Layne 
SMC is your friend.

You can often find good industrial surplus SMC pneumatic components on
sale on eBay that will probably still last halfway to the entropic heat
death of the universe.  There are also apparently SMC components that
are made in China for the Chinese market (same good stuff) that are sold
on FleaBay and Amazon in other markets at prices comparable to the
lesser industrial brands.  I've had good luck with both for common stuff
like an FRG (filter, regulator, gauge), small commodity air cylinders
and common commodity solenoid valves.

Like seemingly everything else, there are probably cheap clones of SMC
parts that are junk.  Caveat emptor.  It's your luck that's what you'll
likely buy on eBay, Gene. :-/





On 2/15/19 9:02 PM, Gene Heskett wrote:
> On Friday 15 February 2019 20:33:44 andy pugh wrote:
>
>> On Sat, 16 Feb 2019 at 01:07, Gene Heskett  
> wrote:
>>> But, if I turn that 6 amps times 12 volts into watts=72, no way in
>>> hell would that survive a 1 hour run time gcode program.
>> Why do you assume that?
>>
>> (and what do you have to lose by testing the assumption?)
> A: From the size of the coil Andy, 72 watts of heat would let ALL the 
> smoke out in 15 minutes or less, Its sold as an air horn valve with an 
> expected duty cycle of <5%, and
>
> B: I don't have a 12 volt, >80 watt psu to do the smoke test with.
>
> C: I'd druther not test my fire insurance.
>
> D: I just bought that Chinese airtec as I can probably regulate the input 
> pressure to below its 0.8MPa ratings.  If not, I just got another $12.50 
> schmardter. :(
>
> Cheers, Gene Heskett




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Re: [Emc-users] Postman semi-good to me today

2019-02-15 Thread Gene Heskett 
On Friday 15 February 2019 20:33:44 andy pugh wrote:

> On Sat, 16 Feb 2019 at 01:07, Gene Heskett  
wrote:
> > But, if I turn that 6 amps times 12 volts into watts=72, no way in
> > hell would that survive a 1 hour run time gcode program.
>
> Why do you assume that?
>
> (and what do you have to lose by testing the assumption?)

A: From the size of the coil Andy, 72 watts of heat would let ALL the 
smoke out in 15 minutes or less, Its sold as an air horn valve with an 
expected duty cycle of <5%, and

B: I don't have a 12 volt, >80 watt psu to do the smoke test with.

C: I'd druther not test my fire insurance.

D: I just bought that Chinese airtec as I can probably regulate the input 
pressure to below its 0.8MPa ratings.  If not, I just got another $12.50 
schmardter. :(

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] Postman semi-good to me today

2019-02-15 Thread andy pugh 
On Sat, 16 Feb 2019 at 01:07, Gene Heskett  wrote:

> But, if I turn that 6 amps times 12 volts into watts=72, no way in hell
> would that survive a 1 hour run time gcode program.

Why do you assume that?

(and what do you have to lose by testing the assumption?)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916


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Re: [Emc-users] Postman semi-good to me today

2019-02-15 Thread Gene Heskett 
On Friday 15 February 2019 17:36:52 Gene Heskett wrote:

> And the solenoid air valve. Purty, chrome plated, and has a coil R of
> about 2.1 ohms, no way I can switch that much 12 volts with a Mesa
> 7i76D. So that will take a booster relay, which I have.
>
But, if I turn that 6 amps times 12 volts into watts=72, no way in hell 
would that survive a 1 hour run time gcode program. So I get slowly 
schmardter.

Does anyone have a suggestion for 12 volt solenoid air valve that would 
survive a 1 hour+ on time?

Thanks & 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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[Emc-users] Postman semi-good to me today

2019-02-15 Thread Gene Heskett 
He brought me a new mirror insert for the ditch side mirror 
i wiped out Monday, fit perfectly.

And the solenoid air valve. Purty, chrome plated, and has a coil R of 
about 2.1 ohms, no way I can switch that much 12 volts with a Mesa 
7i76D. So that will take a booster relay, which I have.

And the repaired 7i76D. Still on an ox cart someplace are the metric 
carriage bolts for use as holddowns, and a bag of plastic nuts to fit 
them, and the dual head spray coolant kit. I took the cnc4pc-C1G version 
4 out of the motor driver box and hooked it back up so I'd have 
something to drive it with while doing the 2nd interface.  Up and down a 
2 step ladder/stool until my legs said that was enough of that.

Finally got in touch with somebody at MPJA.com, & made yet another 
attempt to get my login squared away, this makes 4 times now, and I've 
only been doing business with them for about 34 years.

Progress? But slow...

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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