Re: [Emc-users] another (possibly silly) EDM question

2017-02-13 Thread TJoseph Powderly


On 02/14/17 09:04, Ralph Stirling wrote:
> For you EDM experts out there:  How well would it
> work to do sinker EDM with a 3D printed metal part?
at first i thought you meant a 3D printed electrode...
thats been tried, there are papers but after a couple years have passed,
i hear no adoption of the idea ( printing graphite, printing copper )
> In other words, have a part printed to "near net shape",
> and use a machined (graphite or copper) electrode and
> EDM to take off just enough material to get it to the final
> shape with a smoother surface finish.
hmm... hurdle one, the 3D printer person has to be able to produce and 
electrode
usuially that involves miling/turning and maybe grinding
the surface of the electrode is smoother than the resulting edm surface
but not a lot smoother
look at edm surface finish charts, like VDI 20 to 10
https://www.flickr.com/photos/colorgroup/20716534781
https://www.flickr.com/photos/60055955@N06/16652242101

often the work gets 'scuffed' before edm-ing (esp if polished or plated )

> Am I even correct
> that EDM would give a better finish than the raw SLS
> surface?
afaik edm can do finer than SLS ( and rougher too ;-)
see the vdi charts above
> I've seen titanium parts that were CNC machined
> smooth after 3d printing (I think using electron beam
> melting process), but I'm wondering about using EDM
> instead of CNC machining for the finishing step.
edm is less efficient on already smooth surfaces
since it works on the principle of sparking to the closest point,
it has problems when it cant find the closest point because _all_ points 
appear the same distance.
this is called ( cant see the mountains ;-)

thats what happens when the work is shiny smooth
it can be done but presents a control problem in the classic voltage 
drop gap-width controller.
poor gap-width controls begin to hammer the work

work has been done with a type of ecm and salt baths to super finish 
large flat-ish surfaces
but for highly contoured cavities ( say a molex din connector ) very 
accurate electrodes and time are required to edm finish

my advice: stop edming as soon as possible and hand polish it!
keep those old mold makers and polisher in work.
nudge nudge wink wink

> Thanks,
> -- Ralph
> -
Ralph what do you do at WallaWallaU ? ( sorry it reminds me of a 
Rocky line :-)

tomp


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[Emc-users] another (possibly silly) EDM question

2017-02-13 Thread Ralph Stirling
For you EDM experts out there:  How well would it
work to do sinker EDM with a 3D printed metal part?

In other words, have a part printed to "near net shape",
and use a machined (graphite or copper) electrode and
EDM to take off just enough material to get it to the final 
shape with a smoother surface finish.  Am I even correct
that EDM would give a better finish than the raw SLS
surface?  I've seen titanium parts that were CNC machined
smooth after 3d printing (I think using electron beam
melting process), but I'm wondering about using EDM
instead of CNC machining for the finishing step.

Thanks,
-- Ralph
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Re: [Emc-users] OT: Need some guidance on high temp/pressure water circuit

2017-02-13 Thread Gregg Eshelman
How about using self-closing quick release connectors? They're used in 
hydraulic piping, especially on things like farm and construction equipment 
with attachments that are swapped often.
The amount of fluid loss with each disconnect would be small. Wear nitrile 
gloves and use lint free cloths to wipe the connections. 
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Re: [Emc-users] OT: Need some guidance on high temp/pressure water circuit --> pressure vessel inspection

2017-02-13 Thread Nicklas Karlsson
> > There are requirements on inspection for high pressure vessels.
> >
> > Maybe your device is better used at competing business burning them to
> > death instead of you?
> >
> 
> Well since this is mostly a project to start a business and since I want to
> keep the costs down I would really like to make all the processes on my own
> (If it's really possible off course). I'm trying to figure out the best way
> of doing this.
> 
> I came to the conclusion that the hardest part is the heating of the mold
> in such a short time. Cooling is not going to be a problem at least in the
> safety section.

If you want constant temperature you better look for a material with a suitable 
melt point then heat storage capacity at this temperature would be very good.

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Re: [Emc-users] how to test output pins?

2017-02-13 Thread Valerio Bellizzomi
On Mon, 2017-02-13 at 10:44 -0600, John Thornton wrote:
> The one I wrote.
> 
> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Parallel_Port_Tester
> 
> JT


Thanks.
I ordered a parallel cable on ebay, and found a led, preparing for
testing




> 
> 
> On 2/13/2017 8:26 AM, Valerio Bellizzomi wrote:
> > Thanks Todd, which parallel port test program should I use to toggle the
> > output pins ?
> >
> >
> > Thanks,
> > Valerio
> >
> >
> > On Sat, 2017-02-11 at 09:43 -0500, Todd Zuercher wrote:
> >> Most parallel port plugs have the pins numbered, and the Linuxcnc parport 
> >> driver's hal pin numbers correspond to that numbering.  But if you 
> >> need/want physical conformation, you can probe the parallel port pins with 
> >> an LED adn use the parallel port test program to toggle the outputs 
> >> watching for the LED to change.
> >>
> >> - Original Message -
> >> From: "Valerio Bellizzomi" 
> >> To: "EMC Users" 
> >> Sent: Saturday, February 11, 2017 1:35:53 AM
> >> Subject: [Emc-users] how to test output pins?
> >>
> >> Hello,
> >>
> >> I can test input bits with hal show, but how do I test output pins?
> >>
> >> That is I need to know parallel port physical pin positions in order to
> >> choose my pin schema and make a correspondence hal pin --> physical pin
> >>
> >>
> >> Thanks.
> >>
> >> Valerio
> >>
> >>
> >>
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> >
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Re: [Emc-users] how to test output pins?

2017-02-13 Thread Gene Heskett
On Monday 13 February 2017 12:08:16 TJoseph Powderly wrote:

> Hello, you can look at
> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Parallel_Port_Tester
>
> There is a version in the first linuxcnc screen (aka the config
> picker)
>
> If you use any of these, check the address and if different, make
> copies and edit
>
> These configs set the port simply as type 'output', but you can edit
> such features into your custom version
>
> I have versions for 0xd030 and 0xd010
>
> I recently found a new parport card's 3.3V outputs were not driving my
> 5V stepper amp
> because
> an opto-coupler was used to level shift, and this added a delay by
> rounding the rising edge of the step signal
> the delay was enough to eliminate the step length!
>
> tomp tjtr33

Thats why any output driving an opto s/b true=low. The falling edge is 
not near as slowed then. Thats done by feeding the + of the opto with 5 
volts, and in your hal file for a mesa card,

setp hm2_[HOSTMOT2](BOARD).0.gpio.019.invert_output 1
setp hm2_[HOSTMOT2](BOARD).0.gpio.019.is_opendrain 1

Adjust the .019. as required.

> On 02/13/17 21:26, Valerio Bellizzomi wrote:
> > Thanks Todd, which parallel port test program should I use to toggle
> > the output pins ?
> >
> >
> > Thanks,
> > Valerio
>
> --
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> most engaging tech sites, SlashDot.org! http://sdm.link/slashdot
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Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] M. P. Jones has deal on manual pulse generator

2017-02-13 Thread Gene Heskett
On Monday 13 February 2017 11:35:18 Jon Elson wrote:

> M. P. Jones has some 80 mm manual encoders for $19.95.  100
> pulse/rev, differential output, they don't say anything
> about detents, but hopefully it has them.  Part # is 33106MI
>
> Jon

I saw that Jon, and eagerly await a user report. I could have visions of 
something like a pair of them on the new apron on my Sheldon. I think 
itr would require a 3rd cable across the saddle unless some sort of 
hookup to the wireless keyboard and mouse could be worked out. They also 
have some 2.4Ghz kits that might be able to talk directly to the radio 
in the r-pi 3b.

Andy I believe has a similar 2 dial setup on his Holbrook? We are I 
believe missing out on the use of the radio's in some of our driver 
setups to get rid of 200 feet of cable for this and that, simplifying 
the cabling down to a power supply for this and that. Best bet for the 
com would be the $3.95 a copy 315MHz radio pairs. Encode the 
transmissions with an x10 house code you are not using with heyu in one 
nibble, and the state of the "housecode" in the other nibble.  This has 
a range from 20-200 meters and should be able to ignore most of our 
manmade noises from switching power supplies etc as 95% of that is below 
200 MHz. One receiver feeding a shift register at a 2MHz update rate, 
should be fast enough for a transmitter module to decoded lag between a 
limit switch closure, to linuxcnc seeing it at the rx decoder of perhaps 
10 microseconds.

That would allow us to track 15 limit switches, or 10 toolchanger status 
bits. All this by setting up a housecode for each category of control 
status. The actual protocol we'd need to define if for no other reason 
but a std, so a board could be built and used by all.  X-10/heyu is as 
good as any provided it doesn't clash with your other X-10 stuff. I 
doubt there would be crosstalk between them since X-10 is a very slow 
data rate system. Its a 120 baud system, whereas we could use as high as 
2 megabaud.

This, if these good looking controller dials have a center off detent, 
would lead to some very nice hand controls as we could monitor the 
counts either side of the center off. Then we could set the speed of the 
motion by starting very slow, and multiplying the speed by 1.5 of what 
it currently is for each step farther from center. I like the concept. 
One 74ls138, half of which decodes the housecode nibble, and its output 
becomes the CS for more 74ls138's, each of which then outputs that 
housecodes 4 bit nibble. 1970's tech, it just works. Incorporate a timer 
to disable some of the output bits after 50 milliseconds of the 
transmitter being in the off state.

Obviously I like to play what if. :)  And I have 6 dials, badly worn, 
from some Panasonic video tape editors no longer in use since everything 
is on hard drives today, that I've considered hooking up, possibly 
replacing some centering springs. These are dual dials, a centered off 
outer dial that selects the speed and direction of the tape movement, 
and a center dial with a finger depression that allowed us to spin the 
dial to move the tape, in the direction we spun that dial, on a frame by 
frame basis.

The problem with them was the rubber rims on the outer dial, hand lotion 
dissolved them in a week, natural finger oils in 6 months. Sticky crap 
thats very difficult to remove from your fingers.

They are about the same size, but the encoders are mechanical switches, 
rubbing contacts IOW, and much coarser resolution than these MPJ dials 
are.  And they weren't designed for 100 million revolution life. Plain 
bearings IOW. I may dig one out this evening after I get back from 
visiting the wife, and see if I can decode how it works.

Cheers, Gene Heskett
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
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Re: [Emc-users] M. P. Jones has deal on manual pulse generator

2017-02-13 Thread sam sokolik
That is about the going price on ebay (between $15 and $20..)

we have used a bunch in our projects.  No issues so far.

sam

On 2/13/2017 10:35 AM, Jon Elson wrote:
> M. P. Jones has some 80 mm manual encoders for $19.95.  100
> pulse/rev, differential output, they don't say anything
> about detents, but hopefully it has them.  Part # is 33106MI
>
> Jon
>
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>


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Re: [Emc-users] how to test output pins?

2017-02-13 Thread TJoseph Powderly
Hello, you can look at
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Parallel_Port_Tester

There is a version in the first linuxcnc screen (aka the config picker)

If you use any of these, check the address and if different, make copies 
and edit

These configs set the port simply as type 'output', but you can edit 
such features into your custom version

I have versions for 0xd030 and 0xd010

I recently found a new parport card's 3.3V outputs were not driving my 
5V stepper amp
because
an opto-coupler was used to level shift, and this added a delay by 
rounding the rising edge of the step signal
the delay was enough to eliminate the step length!

tomp tjtr33


On 02/13/17 21:26, Valerio Bellizzomi wrote:
> Thanks Todd, which parallel port test program should I use to toggle the
> output pins ?
>
>
> Thanks,
> Valerio
>
>


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Re: [Emc-users] how to test output pins?

2017-02-13 Thread John Thornton
The one I wrote.

http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Parallel_Port_Tester

JT


On 2/13/2017 8:26 AM, Valerio Bellizzomi wrote:
> Thanks Todd, which parallel port test program should I use to toggle the
> output pins ?
>
>
> Thanks,
> Valerio
>
>
> On Sat, 2017-02-11 at 09:43 -0500, Todd Zuercher wrote:
>> Most parallel port plugs have the pins numbered, and the Linuxcnc parport 
>> driver's hal pin numbers correspond to that numbering.  But if you need/want 
>> physical conformation, you can probe the parallel port pins with an LED adn 
>> use the parallel port test program to toggle the outputs watching for the 
>> LED to change.
>>
>> - Original Message -
>> From: "Valerio Bellizzomi" 
>> To: "EMC Users" 
>> Sent: Saturday, February 11, 2017 1:35:53 AM
>> Subject: [Emc-users] how to test output pins?
>>
>> Hello,
>>
>> I can test input bits with hal show, but how do I test output pins?
>>
>> That is I need to know parallel port physical pin positions in order to
>> choose my pin schema and make a correspondence hal pin --> physical pin
>>
>>
>> Thanks.
>>
>> Valerio
>>
>>
>>
>> --
>> Check out the vibrant tech community on one of the world's most
>> engaging tech sites, SlashDot.org! http://sdm.link/slashdot
>> ___
>> Emc-users mailing list
>> Emc-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/emc-users
>>
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>> engaging tech sites, SlashDot.org! http://sdm.link/slashdot
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>> https://lists.sourceforge.net/lists/listinfo/emc-users
>
>
>
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[Emc-users] M. P. Jones has deal on manual pulse generator

2017-02-13 Thread Jon Elson
M. P. Jones has some 80 mm manual encoders for $19.95.  100 
pulse/rev, differential output, they don't say anything 
about detents, but hopefully it has them.  Part # is 33106MI

Jon

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Re: [Emc-users] how to test output pins?

2017-02-13 Thread Valerio Bellizzomi
Thanks Todd, which parallel port test program should I use to toggle the
output pins ?


Thanks,
Valerio


On Sat, 2017-02-11 at 09:43 -0500, Todd Zuercher wrote:
> Most parallel port plugs have the pins numbered, and the Linuxcnc parport 
> driver's hal pin numbers correspond to that numbering.  But if you need/want 
> physical conformation, you can probe the parallel port pins with an LED adn 
> use the parallel port test program to toggle the outputs watching for the LED 
> to change.
> 
> - Original Message -
> From: "Valerio Bellizzomi" 
> To: "EMC Users" 
> Sent: Saturday, February 11, 2017 1:35:53 AM
> Subject: [Emc-users] how to test output pins?
> 
> Hello,
> 
> I can test input bits with hal show, but how do I test output pins?
> 
> That is I need to know parallel port physical pin positions in order to
> choose my pin schema and make a correspondence hal pin --> physical pin
> 
> 
> Thanks.
> 
> Valerio
> 
> 
> 
> --
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, SlashDot.org! http://sdm.link/slashdot
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Re: [Emc-users] OT: Need some guidance on high temp/pressure water circuit

2017-02-13 Thread Jim Craig
On 2/12/2017 3:17 PM, Leonardo Marsaglia wrote:
> 2017-02-09 12:50 GMT-03:00 Roland Jollivet :
>
>> Remember too, that if this machine is used for any other product, then
>> changing moulds is going to be a nightmare. There's often water slopping
>> about during a tool change.
>>
> Well that's why I thought about using a vacuum pump to suck all the oil
> inside the tubing before making the switch between molds. I'm not saying is
> the best solution but a possible one.
>
>
You could also blow the fluid out of the lines with air pressure. Might 
be easier than a vacuum pump. If just air does not work you could 
possibly pig the lines if there are suitable bends for a pig to make it 
through the entire system. I am not sure of the geometry of the cooling 
chamber in the die.


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