[Emc-users] New problem, how best to solve?

[Roland Jollivet]

If this is for a touch probe or something of the sort, you only need
contact when the RPM < 500?

So, have a setup that if RPM is higher than 500, then a little solenoid
that tensions the braid (not spring, as you say) is released so there is no
tension on it.
You want a copper braid around the spindle..


On Sun, 17 Feb 2019 at 09:01, Gene Heskett  wrote:

> On Saturday 16 February 2019 22:46:26 Roland Jollivet wrote:
>
> > > > Any other ideas out there? Hopefully something that doesn't
> > > > involve changing tools to use.
> >
> > I don't know what your spindle looks like, but to make an electrical
> > connection to it, you could use a piece of earth shield. The woven,
> > braid type that you find on better quality cables. These are usually
> > plated copper, or plain copper. Soft and resilient.
> >
> > Find a place anywhere on the spindle to wrap it a 1/2 turn, pinch the
> > two ends together, and pulled taut with a very light spring. I think
> > it's easier, and better than trying to use brushes.
> > Make a handful while you're at it to replace every 2 years.
>
> I've done that on the G0704 as its spindle has a reasonable speed, 3k
> tops, and I can dial up 50 rpm in either direction.
>
> This is a 24k rpm spindle, with an er11 chuck. So its exposed surface is
> around 9/16" in diameter. At full song, I expect it to burn up the
> spring where the coils touch the spinning chuck. Something along the
> lines of a dremel tool's brush would live much longer. And as it would
> have to run  on the narrow area above the wrench flats, plus the tir is
> at least half a thou, it more than likely would need some sort of a
> retractor simply because the brush is not able to track the tir and
> maintain good contact at the higher speeds. Haveing rebrushed a dremel
> or 5 over the last 65 years, you are wasting your time if you do not
> also turn the commutator to reduce its tir. All you get is excessive
> arcing because the brush is bouncing away from the worn commutator.
>
> That retraction is not a problem other than arranging to do it as the
> spindle revs increase. Where I've used a tool as the contact, I
> generally spin the tool backwards so as not to put cut marks on the work
> when doing the measurements. Retracting the brush when the revs go above
> 5k or so is something I haven't given any thought to. Its also possible
> that some sort of a weak metallic brush could be laid against the
> spindle, but what happens to it when your are spinning it backwards at
> what would be creep speeds.  Given the full song rpms, I don't see a
> long life for any direct contact solution other than the carbon brush.
>
> As soon as I get the new interface I am building up and running so that I
> have enough i/o, I'll put in home switches just so I can set sw limits
> just short of crashes, then I'll probably write me a corner of the
> workpiece finder using the new probe I installed today, making heavy use
> of g38.2, (not applicable to wood projects though, darnit). Then
> determine those x-y offsets and incorporate them into my code.  The
> natural progression then is to write a skeleton that incorporates all
> that, making the next project after this one even easier.
>
> Basicly, I'm lazy, write it once, run it as many times as I need. ;-)
>
> Cheers Roland, 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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>

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Re: [Emc-users] New problem, how best to solve?

[Gene Heskett]

On Saturday 16 February 2019 22:46:26 Roland Jollivet wrote:

> > > Any other ideas out there? Hopefully something that doesn't
> > > involve changing tools to use.
>
> I don't know what your spindle looks like, but to make an electrical
> connection to it, you could use a piece of earth shield. The woven,
> braid type that you find on better quality cables. These are usually
> plated copper, or plain copper. Soft and resilient.
>
> Find a place anywhere on the spindle to wrap it a 1/2 turn, pinch the
> two ends together, and pulled taut with a very light spring. I think
> it's easier, and better than trying to use brushes.
> Make a handful while you're at it to replace every 2 years.

I've done that on the G0704 as its spindle has a reasonable speed, 3k 
tops, and I can dial up 50 rpm in either direction.

This is a 24k rpm spindle, with an er11 chuck. So its exposed surface is 
around 9/16" in diameter. At full song, I expect it to burn up the 
spring where the coils touch the spinning chuck. Something along the 
lines of a dremel tool's brush would live much longer. And as it would 
have to run  on the narrow area above the wrench flats, plus the tir is 
at least half a thou, it more than likely would need some sort of a 
retractor simply because the brush is not able to track the tir and 
maintain good contact at the higher speeds. Haveing rebrushed a dremel 
or 5 over the last 65 years, you are wasting your time if you do not 
also turn the commutator to reduce its tir. All you get is excessive 
arcing because the brush is bouncing away from the worn commutator.

That retraction is not a problem other than arranging to do it as the 
spindle revs increase. Where I've used a tool as the contact, I 
generally spin the tool backwards so as not to put cut marks on the work 
when doing the measurements. Retracting the brush when the revs go above 
5k or so is something I haven't given any thought to. Its also possible 
that some sort of a weak metallic brush could be laid against the 
spindle, but what happens to it when your are spinning it backwards at 
what would be creep speeds.  Given the full song rpms, I don't see a 
long life for any direct contact solution other than the carbon brush.

As soon as I get the new interface I am building up and running so that I 
have enough i/o, I'll put in home switches just so I can set sw limits 
just short of crashes, then I'll probably write me a corner of the 
workpiece finder using the new probe I installed today, making heavy use 
of g38.2, (not applicable to wood projects though, darnit). Then 
determine those x-y offsets and incorporate them into my code.  The 
natural progression then is to write a skeleton that incorporates all 
that, making the next project after this one even easier.

Basicly, I'm lazy, write it once, run it as many times as I need. ;-)

Cheers Roland, 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] New problem, how best to solve?

[Roland Jollivet]

> > Any other ideas out there? Hopefully something that doesn't involve
> > changing tools to use.
> >

I don't know what your spindle looks like, but to make an electrical
connection to it, you could use a piece of earth shield. The woven, braid
type that you find on better quality cables. These are usually plated
copper, or plain copper. Soft and resilient.

Find a place anywhere on the spindle to wrap it a 1/2 turn, pinch the two
ends together, and pulled taut with a very light spring. I think it's
easier, and better than trying to use brushes.
Make a handful while you're at it to replace every 2 years.

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[Emc-users] Doc problem

[Gene Heskett]

Greetings all;

Because of some odd goings on, like a 4mm end mill being drawn as if it 
was a 3" face mill, I figured it was about time I added
RS274NGC_STARTUP_CODE= to the .ini file. But the docs are wrong, 
recommending a bare G92 in the string shown when it likely ought to be a 
G92 R0.000.

Its an error if no axis are given.  And that did fix my problem. And the 
alignment stuff is working with the separate probe except I need to 
figure out how to pre-run the first 50 lines or so of this code in order 
to create the global vars the align_start script expects to exist. This 
looks like a place where an M68 might bridge that gap.

Otherwise its Chicken V. Egg. :-{

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] New problem, how best to solve?

[Gene Heskett]

On Saturday 16 February 2019 14:28:33 Chris Albertson wrote:

> Thinking about this as an electrical engineer,  I'd say don't use DC.
> DC current is as you say blocked by paint and oil films.Use  AC.
> I think a low radio frequency.   Then the DC insulators would act like
> capacitors and pass AC. even while blocking DC.  To detect contact use
> an AC voltage sensor, typically a diode and small capacitor.

The disadvantage there is the rc charge time. This means among other 
things a relatively leasure velocity to the first trip, and a much 
slower 2nd approach, where as in using the dc circuit, one usually uses 
a rotating with the spindle probe so even  if it has some runnout, the 
contact surface is recorded an by the first contact discharging a .1 
ufcapacitor, which takes long enough to recharge that the contacts logic 
zero, is captured and reported to LCNC instantly even if by the time the 
servo thread actually reads it, the contact has been lost again for .9 
milliseconds. The rf circuit, cannot possibly respond in that time frame 
unless the closing velocities are also very slow. The DC method is 
inherently the faster method, but does require a very low ohmage 
connection in order to fully discharge the cap  on a 10 microsecond 
contact.  And we definitely DON'T have a low resistance circuit on this 
machine.

I have one of this old tony's contacts about 75% made, but out of a brass 
tube instead of a steel probe and I'll take the machine out of it by 
grounding the workpiece, and wiring the tube straight to the probe 
input, using the same old cap for storage. The brass is long enough it 
can hit and be bent 1/4" without damage as it will just spring back.

But its been a long day today.  I'll figure out something thats hopefully 
repeatable.   

And I've got to figure what to do Monday as my lady adds another year to 
her journey on this ball of rock and water, making it to her 79nth.

Something she'll appreciate without any physical effort. With copd, 
there's not much of that left.  Sigh...

That said, I think the DC method can be made to work with a separately 
wired probe, with both the ground on the workpiece and the hot on the 
probe wired independently from the machine. Run the probe cable as a 
shielded wire in the cable chain.  At least this chain can be opened to 
add more wire, something none of the other cable chain I've bought can 
do.  Nice!
> I don't know if this is done commercially but the AC method should in
> theory by MUCH more reliable.You can even use very long cables if
> you use strong filters tuned to the frequency. Notice how well the
> current passes from an AM radio station to your radio even over a
> miles-long air gap.
>
> My guess is that a 100 KHz signal would go right through paint.
>
> On Sat, Feb 16, 2019 at 9:46 AM Gene Heskett  
wrote:
> > Greetings all;
> >
> > I've just found that because everything it painted before assembly,
> > apparently including the inside of the spindle motor mount, that a
> > ground to the bed frame can be anywhere up to 2 or more thousand
> > ohms to almost anything else on the 6040, and apparently even
> > includes the spindle bearings as part of the first 50 or so ohms.
> >
> > The net result is that using the workpiece as one contact, the the
> > tool in the spindle as the other for the alignment function is
> > fraught with enough variables I could break a tool against the edge
> > of the workpiece, even damaging the workpiece, before a contact is
> > detected. Since there isn't Z room enough for one of those $65
> > spindle mounted contact detectors, and it would take at least ten
> > feet of ground braid strung thru the cable chains to arrive at a
> > decent ground on the motor housing, which wouldn't solve the problem
> > entirely because of the oil film in the spindle bearings, how the
> > heck do I arrive at a reliable connection that only responds to a
> > contact between the tool and the workpiece?
> >
> > A flying ground lead one could bring up and clip onto the tool would
> > probably work, but sure resembles something Robe Goldburg would
> > dream up as it would need to be long enough to reach the tool
> > regardless of where it is on the table.
> >
> > That, or using a much higher voltage limited to a few microamps so
> > as not to constitute a shock hazard. But basically use it to measure
> > the air gap. I could make that work even before a physical contact
> > was made but thats not a tasty idea in the long view either.
> >
> > Any other ideas out there? Hopefully something that doesn't involve
> > changing tools to use.
> >
> > Thanks all.
> >
> > 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 
> >
> >
> >
> > ___
> > Emc-users mailing list
> > 

Re: [Emc-users] New problem, how best to solve?

[Chris Albertson]

Thinking about this as an electrical engineer,  I'd say don't use DC.
DC current is as you say blocked by paint and oil films.Use  AC.
I think a low radio frequency.   Then the DC insulators would act like
capacitors and pass AC. even while blocking DC.  To detect contact use
an AC voltage sensor, typically a diode and small capacitor.

I don't know if this is done commercially but the AC method should in
theory by MUCH more reliable.You can even use very long cables if
you use strong filters tuned to the frequency. Notice how well the
current passes from an AM radio station to your radio even over a
miles-long air gap.

My guess is that a 100 KHz signal would go right through paint.


On Sat, Feb 16, 2019 at 9:46 AM Gene Heskett  wrote:
>
> Greetings all;
>
> I've just found that because everything it painted before assembly,
> apparently including the inside of the spindle motor mount, that a
> ground to the bed frame can be anywhere up to 2 or more thousand ohms to
> almost anything else on the 6040, and apparently even includes the
> spindle bearings as part of the first 50 or so ohms.
>
> The net result is that using the workpiece as one contact, the the tool
> in the spindle as the other for the alignment function is fraught with
> enough variables I could break a tool against the edge of the workpiece,
> even damaging the workpiece, before a contact is detected. Since there
> isn't Z room enough for one of those $65 spindle mounted contact
> detectors, and it would take at least ten feet of ground braid strung
> thru the cable chains to arrive at a decent ground on the motor housing,
> which wouldn't solve the problem entirely because of the oil film in the
> spindle bearings, how the heck do I arrive at a reliable connection that
> only responds to a contact between the tool and the workpiece?
>
> A flying ground lead one could bring up and clip onto the tool would
> probably work, but sure resembles something Robe Goldburg would dream up
> as it would need to be long enough to reach the tool regardless of where
> it is on the table.
>
> That, or using a much higher voltage limited to a few microamps so as not
> to constitute a shock hazard. But basically use it to measure the air
> gap. I could make that work even before a physical contact was made but
> thats not a tasty idea in the long view either.
>
> Any other ideas out there? Hopefully something that doesn't involve
> changing tools to use.
>
> Thanks all.
>
> 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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-- 

Chris Albertson
Redondo Beach, California


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Re: [Emc-users] Would this blower be usefull as a low pressure mister for this 6040

[Chris Albertson]

Notice that now-days many of the "standard" SI units are named for
long-dead scientests

Volt,
Ampere,
Watt,
Henry,
Farad,
Joule,
Hertz,
Newton,
Pascal,
Celsus,
Kelvin,

Likely a lot more I can't remember.  If you know a little history you
can remember them.   I think that is why they use proper names,
because each has a back-story making it easier to remember.  If you
know some history of science the unit names are impossible to forget.
They even changed the names of some old units to make them proper
names.  We used to say  "Cycles" but now use "Hertz" and we used to
use "Centigrade" but now "Celsius".

So in this case, read a little about  Blaise Pascal.   He did many
experiments with barometers so they named the unit of pressure
(Newtons per square meter) after him.  Likewise, it was Newton who
un-scrambled the difference between force, weight, and mass so the
unit of force is Newton.

By now we all know what "0.8 MPa" means.  It is 0.8 million newtons
per square meter.

>
> > Operating pressure 0.15~0.8MPa supposed to tell me??? Need a translation
> > from chinglish please. I haven't a clue what the heck 0.8MPa means.

-- 

Chris Albertson
Redondo Beach, California


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Re: [Emc-users] New problem, how best to solve?

[jrmitchellj]

I had a similar issue with a Shapeoko router.
There was no continuity from the spindle rotor to the rest of the assembly.
My solution was to mount a brush above the spindle motor shaft, to make
contact on the end of the shaft, then bring that back to the sense input.
And, yes, I brought a ground wire out to the workpiece to be sure the
circuit would be complete.

--J. Ray Mitchell Jr.
jrmitche...@gmail.com
(818)324-7573


"No problem can be solved from the same level of consciousness that created
it"Albert Einstein


On Sat, Feb 16, 2019 at 9:47 AM Gene Heskett  wrote:

> Greetings all;
>
> I've just found that because everything it painted before assembly,
> apparently including the inside of the spindle motor mount, that a
> ground to the bed frame can be anywhere up to 2 or more thousand ohms to
> almost anything else on the 6040, and apparently even includes the
> spindle bearings as part of the first 50 or so ohms.
>
> The net result is that using the workpiece as one contact, the the tool
> in the spindle as the other for the alignment function is fraught with
> enough variables I could break a tool against the edge of the workpiece,
> even damaging the workpiece, before a contact is detected. Since there
> isn't Z room enough for one of those $65 spindle mounted contact
> detectors, and it would take at least ten feet of ground braid strung
> thru the cable chains to arrive at a decent ground on the motor housing,
> which wouldn't solve the problem entirely because of the oil film in the
> spindle bearings, how the heck do I arrive at a reliable connection that
> only responds to a contact between the tool and the workpiece?
>
> A flying ground lead one could bring up and clip onto the tool would
> probably work, but sure resembles something Robe Goldburg would dream up
> as it would need to be long enough to reach the tool regardless of where
> it is on the table.
>
> That, or using a much higher voltage limited to a few microamps so as not
> to constitute a shock hazard. But basically use it to measure the air
> gap. I could make that work even before a physical contact was made but
> thats not a tasty idea in the long view either.
>
> Any other ideas out there? Hopefully something that doesn't involve
> changing tools to use.
>
> Thanks all.
>
> 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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>

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Re: [Emc-users] Would this blower be usefull as a low pressure mister for this 6040

[jrmitchellj]

Most of the pneumatic valves I use have a small actuator (coil) that opens
a small air passage to push the thimble within the valve body to the
requested position.
I recall that they are called "pilot valves".
So they use a very small amount of current to do a very big job.

I have used Parker pilot valves in the past, but they have gotten way too
expensive, so I am trying some from China.
I found (on ebay) Toolots, that carry products from Pneulead.  I hope to
get them installed on my mill this weekend.

I am using 3/8" units, as I needed that for my power drawbar.

--J. Ray Mitchell Jr.
jrmitche...@gmail.com
(818)324-7573


"No problem can be solved from the same level of consciousness that created
it"Albert Einstein


On Sat, Feb 16, 2019 at 6:14 AM Peter Blodow  wrote:

> Andy, you forgot that blood pressure in Europe is measured in mm of
> mercury...
> Peter
>
> Am 16.02.2019 um 12:47 schrieb Andy Pugh:
> >
> >> On 16 Feb 2019, at 09:21, Erik Christiansen 
> wrote:
> >>
> >> as lb/in^2 isn't right
> > It can be, if you measure oil consumption in slugs.
> >
> > We use hPa a lot at work. It annoys me.
> > In fact the same software in various places uses hPa, kPa, MPa, bar, psi
> and inches of mercury!
> >
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>
>
>
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[Emc-users] New problem, how best to solve?

[Gene Heskett]

Greetings all;

I've just found that because everything it painted before assembly, 
apparently including the inside of the spindle motor mount, that a 
ground to the bed frame can be anywhere up to 2 or more thousand ohms to 
almost anything else on the 6040, and apparently even includes the 
spindle bearings as part of the first 50 or so ohms.

The net result is that using the workpiece as one contact, the the tool 
in the spindle as the other for the alignment function is fraught with 
enough variables I could break a tool against the edge of the workpiece, 
even damaging the workpiece, before a contact is detected. Since there 
isn't Z room enough for one of those $65 spindle mounted contact 
detectors, and it would take at least ten feet of ground braid strung 
thru the cable chains to arrive at a decent ground on the motor housing, 
which wouldn't solve the problem entirely because of the oil film in the 
spindle bearings, how the heck do I arrive at a reliable connection that 
only responds to a contact between the tool and the workpiece?

A flying ground lead one could bring up and clip onto the tool would 
probably work, but sure resembles something Robe Goldburg would dream up 
as it would need to be long enough to reach the tool regardless of where 
it is on the table.

That, or using a much higher voltage limited to a few microamps so as not 
to constitute a shock hazard. But basically use it to measure the air 
gap. I could make that work even before a physical contact was made but 
thats not a tasty idea in the long view either.

Any other ideas out there? Hopefully something that doesn't involve 
changing tools to use.

Thanks all.

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] Would this blower be usefull as a low pressure mister for this 6040

[Peter Blodow]

Andy, you forgot that blood pressure in Europe is measured in mm of 
mercury...

Peter

Am 16.02.2019 um 12:47 schrieb Andy Pugh:



On 16 Feb 2019, at 09:21, Erik Christiansen  wrote:

as lb/in^2 isn't right

It can be, if you measure oil consumption in slugs.

We use hPa a lot at work. It annoys me.
In fact the same software in various places uses hPa, kPa, MPa, bar, psi and 
inches of mercury!

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Re: [Emc-users] Would this blower be usefull as a low pressure mister for this 6040

[Erik Christiansen]

On 16.02.19 11:47, Andy Pugh wrote:
> 
> 
> > On 16 Feb 2019, at 09:21, Erik Christiansen  wrote:
> > 
> > as lb/in^2 isn't right 
> 
> It can be, if you measure oil consumption in slugs. 

True ... but then a slug is lbf s^2 / ft, and I have enough trouble with
those venerable units without resorting to the wriggly ones.

> We use hPa a lot at work. It annoys me. 
> In fact the same software in various places uses hPa, kPa, MPa, bar, psi and 
> inches of mercury!

But we freely use ohm, kilohm, and megohm to avoid superfluous
zeroes. Similarly, 1 hPa is immediately recognisable as 1 millibar,
given that a bar is 1e5 Pa. None of hPa, kPa, MPa, bar do anything other
than move the decimal point, providing notational shorthand. I will
admit that Aussies are slow to adopt the cm, using only mm and meter, so
a door is 2040 mm, not just 204 cm. Give it another generation, perhaps.

I am though old enough that my tire inflation is gauged in psi. But the
design of the concrete slab for my off-grid build is specified in MPa.
That makes life easy as I know my machine masses in kg and their base
areas in m².

The only unit which annoys me is the basispoint, used in finance to
shift the decimal point two digits ... er, like hPa.

Erik


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Re: [Emc-users] Would this blower be usefull as a low pressure mister for this 6040

[Gene Heskett]

On Saturday 16 February 2019 06:47:58 Andy Pugh wrote:

> > On 16 Feb 2019, at 09:21, Erik Christiansen
> >  wrote:
> >
> > as lb/in^2 isn't right
>
> It can be, if you measure oil consumption in slugs.
>
> We use hPa a lot at work. It annoys me.
> In fact the same software in various places uses hPa, kPa, MPa, bar,
> psi and inches of mercury!
>
And I sense a certain amount of marketting "if you can't dazzle them with 
brilliance, baffle them with bull shit" attitudes in quite a bit of this 
stuff.

Si standards for this stuff are nice, but theres way too many of them. 
Often using the exact same method to measure, but shifting the implied 
decimal points location. Particularly since the 'a' may be assumed to be 
one atmosphere, conveniently given a std value but fully capable of 
varying 25% according to the barometer and altitude in actual practice, 
at altitudes capable of supporting human life comfortably.

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] Would this blower be usefull as a low pressure mister for this 6040

[Gene Heskett]

On Saturday 16 February 2019 04:21:10 Erik Christiansen wrote:

> On 15.02.19 20:46, Gene Heskett wrote:
> > I found a 12 volt 1/4" version, but what the heck is
> > Operating pressure 0.15~0.8MPa supposed to tell me??? Need a
> > translation from chinglish please. I haven't a clue what the heck
> > 0.8MPa means.
>
> OK, it's been answered for that number, but for catching the next
> fish, on your linux box:
>
> $ units
> ...
>
> You have: 0.8 MPa
> You want: psi
> * 116.03019
> / 0.0086184466
>
> That's forward and backward conversions.
> If insisting on more basic expression of units, you'd need:
>
> You want: lbf/in^2
>
> as lb/in^2 isn't right and it'll tell you.
> (It does keep you on your toes, unit-wise.)
>
> Erik
>
Which is one of the reasons I stayed with 1/4" valves. Going up to 1/2" 
stuff seemed to imply needing lots more actuating forces. If 1/8" had 
been available, I likely would have bought one of those as an 1/8" port 
should have supplied sufficient air.

besides, I only have the output regulator turned up to 60 or so, enough 
to clean the area with a hand nozzle.
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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] Would this blower be usefull as a low pressure mister for this 6040

[Andy Pugh]

> On 16 Feb 2019, at 09:21, Erik Christiansen  wrote:
> 
> as lb/in^2 isn't right 

It can be, if you measure oil consumption in slugs. 

We use hPa a lot at work. It annoys me. 
In fact the same software in various places uses hPa, kPa, MPa, bar, psi and 
inches of mercury!

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Re: [Emc-users] Would this blower be usefull as a low pressure mister for this 6040

[Erik Christiansen]

On 15.02.19 20:46, Gene Heskett wrote:
> I found a 12 volt 1/4" version, but what the heck is
> Operating pressure 0.15~0.8MPa supposed to tell me??? Need a translation 
> from chinglish please. I haven't a clue what the heck 0.8MPa means.

OK, it's been answered for that number, but for catching the next fish,
on your linux box:

$ units
...

You have: 0.8 MPa
You want: psi
* 116.03019
/ 0.0086184466

That's forward and backward conversions.
If insisting on more basic expression of units, you'd need:

You want: lbf/in^2

as lb/in^2 isn't right and it'll tell you.
(It does keep you on your toes, unit-wise.)

Erik


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