Re: Compressed air

Leon Robinson
 

The pressure switch is available at Graingers.

Sent from K5JLR

-------- Original message --------
From: David Kuhn <Daveyk021@...>
Date: 05/02/2019 11:50 AM (GMT-06:00)
To: TekScopes@groups.io
Subject: Re: [TekScopes] Compressed air

" Your idea is correct, the large belt driven compressors are the best and
places like Harbor Freight has them brand new for a reasonable price.  "

Yea, I have been tempted a few times to use the 25% off coupon to get one,
but I usually do not hear good things about there electrical tools.

There is an elderly lady down the block that we are friends with.  Her
husband (dead 20+ years now) has one of those six foot belt driver
compressors near their garage door; I think it is hard wired.  She might
use it once a year.  When I turned it on, it was amazingly not deafening.
It looks like it was built very well.  I can't get her to  give it or sell
it to me - lol.  I kind of pine for it.  It is very old, but still works
great and I am sure built better than anything harbor freight has.  Anyway,
I'm not sure I should offer much because of its age and I might be better
off with a new one.  They probably all need the pressure/electric switch
changed every few years and I am not sure where to get that part.  My
original one in the dog house, probably 29 years old now and still looking
nice, needs that pressure switch.  I could never find the MFG parts list
and you wouldn't get one from them after all these years.  I haven't found
generic ones either.  Maybe there is generic kits to re-plumb old air
compressors?  I'll have to look.

Sorry, this is off topic, but I feel every electronics repair lab should
have compress air.  Heck where I worked, before GE moved everything, and
our jobs overseas, I used a nice high pressure air line.  I could wash
boards off with Simple green and then ISO and blow dry them do dry that I
could power them up right away without letting them dry overnight.  The air
sound drove other around me nuts, but you do what you have to do.  At one
point, maintenance was going to change my compressed air plumbing to the
nitrogen line (we had a huge nitrogen tank outside) for the drying of
boards, then our closing was announce and no one gave a shite about
anything for the next year and a half 8-(.  So nitrogen would be better for
drying and dusting board than compressed air, but I would not want to foot
that bill.

Dave

Dave

On Thu, May 2, 2019 at 11:48 AM Tony Fleming <czecht@...> wrote:

Your idea is correct, the large belt driven compressors are the best and
places like Harbor Freight has them brand new for a reasonable price.
Don't forget the water filtration and drain the water from the tank. You
could make a "self draining" or "automatic" condensation purge with an
Arduino or ESP32/ESP8266 and few more parts to open valve.
But a reminder once a month should give you time to check the system and
drain the water from the tank.


On Thu, May 2, 2019 at 10:24 AM David Kuhn <Daveyk021@...> wrote:

" Because they don't have a "quiet" air compressor.  "

That's the biggest problem.  In the garage, I built a compressor dog
house
with six inch walls with insulation on all side.  Even the access door is
6" thick with insulation.  It worked great, but the air compressor got
used hard.  Well know the saying "out of sight, out of mind"?  That's the
problem.  It never got maintenance.  Now, I just let it be noisy in the
garage as needed.  I don't use it that much, so I just go out and turn it
on as-needed rather than let it be automatic.  I would like to have a
huge
tall tank that hold a lot of air; but they can be expensive.  I need to
go
to some auctions and find a six foot tall belt driven compressor that can
run only every so often and let it on automatic.


On Wed, May 1, 2019 at 9:59 PM Harvey White <madyn@...>
wrote:

On Wed, 1 May 2019 14:53:04 +0200, you wrote:

I hear conflicting reports on what one should do. What's your take?
Are there different types where you should or shouldn't?
Compressed air isn't.  There's not enough room in the an.


Druckluft 67 (aka Dust Off 67) from Kontakt / CRC says not to shake
the can "or otherwise the fluid might come out", but is it always the
case with all types? What is that fluid for, anyways?
The fluid evaporates, produces gas, and that's what your "compressed
air" happens to be.



I read reviews of some cheaper compressed air products on amazon and
they complained about the quality. What can go wrong with compressed
air?
Liquid for one, which you don't want, and then again, what's the
liquid that's evaporating to give you this "air"?

Two things people brought up were one brand produced very weak
pressure, and another produced flammable rather than inert gas.
Depends on what's evaporating.  Butane would work, so would freon, so
would a lot of other things, includin propane.

Druckluft 67 touts as being oil free. Are there other things that
might go wrong?
er..... what's in that liquid?


Why would someone use canned compressed air rather than an air
compressor?

Because they don't have an air compressor.  Because they don't know
the difference.  Because they don't have a "quiet" air compressor.
Because they don't have the driers and particle filters to clean up
the output air from the compressor (which may or may not have oil in
it from the air pump).

Harvey


Thanks.









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