Enhanced Machine Controller

On Sun, 2010-01-03 at 01:20 +0000, Steve Blackmore wrote:
> On Sat, 2 Jan 2010 11:04:29 -0800, you wrote:
... snip
> >Chinese valves freeze and crack. This is because of voids and porosity of 
> >the castings.
> 
> Dezincification failures are a big problem with cheap fittings
> especially if they have been in use for some time in acidic water, and
> it's not just a Chinese thing. I've seen it on European and USA made
> fittings. The "American" fittings are probably DZR Brass, the Chinese
> are probably any old recycled Brass, likely the shavings Matt was
> talking about :)
> 
> Good quality brass fittings are made from CZ132 Brass, which needs heat
> treating to 500C or so after forging to resist dezincification.
> 
> You can buy good Chinese fittings, just as you can buy bad American
> ones. If you do suffer from dezincification buying from a good plumbers
> supply shop or marine chandlers is a safer bet, you'll pay more, but
> they should be able to supply decent fitting that will last a lifetime.
> 
> Steve Blackmore

Thanks for the information Steve. Google also linked:
http://www.hghouston.com/coppers/brass75.htm 
http://en.wikipedia.org/wiki/Brass 
http://en.wikipedia.org/wiki/DZR 

among other good links. I'm going to need a bigger head to fit some of
this in.

-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA

On Saturday 02 January 2010, Kirk Wallace wrote:
>On Sun, 2010-01-03 at 01:20 +0000, Steve Blackmore wrote:
>> On Sat, 2 Jan 2010 11:04:29 -0800, you wrote:
>
>... snip
>
>> >Chinese valves freeze and crack. This is because of voids and porosity
>> > of the castings.
>>
>> Dezincification failures are a big problem with cheap fittings
>> especially if they have been in use for some time in acidic water, and
>> it's not just a Chinese thing. I've seen it on European and USA made
>> fittings. The "American" fittings are probably DZR Brass, the Chinese
>> are probably any old recycled Brass, likely the shavings Matt was
>> talking about :)
>>
>> Good quality brass fittings are made from CZ132 Brass, which needs heat
>> treating to 500C or so after forging to resist dezincification.
>>
>> You can buy good Chinese fittings, just as you can buy bad American
>> ones. If you do suffer from dezincification buying from a good plumbers
>> supply shop or marine chandlers is a safer bet, you'll pay more, but
>> they should be able to supply decent fitting that will last a lifetime.
>>
>> Steve Blackmore
>
>Thanks for the information Steve. Google also linked:
>http://www.hghouston.com/coppers/brass75.htm
>http://en.wikipedia.org/wiki/Brass
>http://en.wikipedia.org/wiki/DZR
>
>among other good links. I'm going to need a bigger head to fit some of
>this in.

Well, we could be like Garfield and claim the overflow is in our stomach. ;-P

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

Linux: the operating system with a CLUE... Command Line User Environment.
	-- seen in a posting in comp.software.testing

On 1/2/2010 2:04 PM, Andy Pugh wrote:
> 2010/1/2 Dave<EMC@...>:
>
>    
>> If I have a
>> leaking pipe and the water is off in the house -  the heat and AC is
>> also off (ground water heat pump), so I am not tempted to order stuff
>> from McMaster Carr for delivery in a day or two.  The 4 others I live
>> with (of the opposite sex) have a problem with that!
>>      
> Sounds like a good reason to buy (or<back on topic>  make) some
> stainless fittings to have at hand next time it all goes wrong.
>
>    
Obviously what I should really do is to buy decent fittings and replace 
them before I get a failure again.

I've replaced all of them several times already..... it's just a matter 
of time.

My water PH is very close to neutral so I know the failures are product 
related.

Dave

On Sat, 02 Jan 2010 23:54:54 -0500, you wrote:


>My water PH is very close to neutral so I know the failures are product 
>related.

Hi Dave

Not necessarily, could be galvanic reaction due to dissimilar metals, or
electrolytic if you have some stray electricity grounding to the pipes.
(seems a common problem with pumps or if you have "earthed" to the water
pipes). Particularly bad in water with a lot of dissolved solids, that
will remove the zinc coating very quickly. Galvanised fittings on steel
pipe can be worse than plain iron fittings in certain circumstances. 304
stainless (passive type) or 316 stainless are much better. 

All the fittings we used to make had to be to the appropriate standard,
those for potable water had to be approved by the UK water authorities
and all had to carry the BSI Kite mark. Those approvals still apply and
anyone found importing, selling or installing non approved fittings
could, in theory, be prosecuted. Seems nanny state, but not if your
house floods, your boat sinks, or your sprinkler system fails ;)

Steve Blackmore
--

On 1/3/2010 6:01 AM, Steve Blackmore wrote:
> On Sat, 02 Jan 2010 23:54:54 -0500, you wrote:
>
>
>    
>> My water PH is very close to neutral so I know the failures are product
>> related.
>>      
> Hi Dave
>
> Not necessarily, could be galvanic reaction due to dissimilar metals, or
> electrolytic if you have some stray electricity grounding to the pipes.
> (seems a common problem with pumps or if you have "earthed" to the water
> pipes). Particularly bad in water with a lot of dissolved solids, that
> will remove the zinc coating very quickly. Galvanised fittings on steel
> pipe can be worse than plain iron fittings in certain circumstances. 304
> stainless (passive type) or 316 stainless are much better.
>
> All the fittings we used to make had to be to the appropriate standard,
> those for potable water had to be approved by the UK water authorities
> and all had to carry the BSI Kite mark. Those approvals still apply and
> anyone found importing, selling or installing non approved fittings
> could, in theory, be prosecuted. Seems nanny state, but not if your
> house floods, your boat sinks, or your sprinkler system fails ;)
>
> Steve Blackmore
> --
>
>
>    

Good points.  I think stainless is the answer.  The house is 1968 
vintage and some of the pump piping still has galvanized fittings from 
when the well was first drilled 20+ years ago.  Downstream in the same 
line are fittings I have installed that have failed repeatedly over the 
years.    The old ones hold up, while the newer ones disintegrate.    
Most of the piping is plastic.  But there are places were plastic does 
not work well.  The US is pretty lax about what can be sold as pipe 
fittings on shelf in a "Home Depot" type store.  There are no testing 
standards that have to be met to my knowledge.  No UL, CSA etc.  The 
fittings don't even have the schedule on the bins.  All I can surmise is 
that they are of very low quality.

Dave

Here in my part of Canada (at least) insurance companies will not insure 
a home if it as one bit of "galvanized" pipe in it.....
guess that says a lot about what they think about the reliability of 
galvanized pipe.
Wayne

On 03/01/2010 12:16 PM, Dave wrote:
> On 1/3/2010 6:01 AM, Steve Blackmore wrote:
>    
>> On Sat, 02 Jan 2010 23:54:54 -0500, you wrote:
>>
>>
>>
>>      
>>> My water PH is very close to neutral so I know the failures are product
>>> related.
>>>
>>>        
>> Hi Dave
>>
>> Not necessarily, could be galvanic reaction due to..........snip
>>      
> Good points.  I think stainless is the answer.  ...........snip
>
> Dave
>
>
>

On 1/3/2010 12:23 PM, Wayne Parks wrote:
> Here in my part of Canada (at least) insurance companies will not insure
> a home if it as one bit of "galvanized" pipe in it.....
> guess that says a lot about what they think about the reliability of
> galvanized pipe.
> Wayne
>
> On 03/01/2010 12:16 PM, Dave wrote:
>    
>> On 1/3/2010 6:01 AM, Steve Blackmore wrote:
>>
>>      
>>> On Sat, 02 Jan 2010 23:54:54 -0500, you wrote:
>>>
>>>
>>>
>>>
>>>        
>>>> My water PH is very close to neutral so I know the failures are product
>>>> related.
>>>>
>>>>
>>>>          
>>> Hi Dave
>>>
>>> Not necessarily, could be galvanic reaction due to..........snip
>>>
>>>        
>> Good points.  I think stainless is the answer.  ...........snip
>>
>> Dave
>>
>>
>>
>>      
>
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>    
Interesting as I grew up in a house that was 100% galvanized pipe.  We 
lived there for 17 years and my father never touched the plumbing other 
than perhaps replacing a faucet.
That was on the west side of Detroit and the house was fed with Detroit 
City water which is known for being very soft.   I didn't know what a 
water softener was until we moved away from there.   I prefer copper, 
although PVC is not bad.    It will be interesting to see how these new 
PEX systems hold up in 25 years or so.

Dave

On Sunday 03 January 2010, Ed Nisley wrote:
>> ... if anyone will be set up there again this year
>
>I'll bring my little Sherline CNC mill & stack o'
>simpleminded projects again. If the conference room isn't
>full up, I'll do my "Why CNC? An Introduction" song & dance
>routine, too.

Now that needs to be made into a utube movie so we can all enjoy it. ;)

>Gotta start printing some handouts pretty quick!

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

  She used to diet on any kind of food she could lay her hands on.
  -Arthur Baer, American comic and columnist

2010/1/3 Chris Reynolds <c_reynolds2571@...>:
>
> I saw a video online of someone using an edge finding routine, not in emc, but I was wondering if there is something similar in emc.

Yes, G38.
http://www.linuxcnc.org/docview/html/gcode_main.html#sub:G38.2:-Straight-Probe

There is example G-Code to find a hole centre at
http://www.linuxcnc.org/handbook/RS274NGC_3/RS274NGC_33a.html#1001097

-- 
atp