Re: [Emc-users] Home switches.

[Marcus Bowman]

> 
> And that brings up the third question about a 4th axis.  If you have one, do
> you tend to put it on the left just like a lathe spindle or on the right?
> Any reason for the preference?  Often there are tool changers on the left so
> it makes more sense to have the 4th on the right.

My mill is a benchtop-style arrangement, rather than a Bridgeport-style knee 
mill.
My 4th Axis is based on a large diameter rotary table, mounted on its side.
I always put my 4th axis on the left, because if I put it on the right, it 
would foul the quill handle, if I used it. Separate quill feed is manual, and 
although I can't recall the last time I used that handle in conjunction with 
the 4th axis, it's always a possibility. 
That position means feeds along the work at -ve X, which is not intuitively 
convenient, but I live with it.

Marcus
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[Emc-users] Encoders

[jeremy youngs]

New thread, as I seem to be done getting the 7i90 functional.
These are capacitive and seem to have good response, universal and
programmable. And cheap and u.s. stock, 15.3 mm is the largest of them I
can find, and I don't understand what they say about axial or radial mount
. I will call them tomorrow .

https://www.mouser.com/ProductDetail/CUI/AMT103-V?qs=sGAEpiMZZMsWp46O%252bq11Wc6D0rLp%252bQH%2fN7GEqDkL%2fc8%3d
Any thoughts? Seems like a good solution , for a stocking part a fella
could even keep a couple to gather dust .
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Re: [Emc-users] 7i90 not listed in pnc

[Gene Heskett]

On Friday 25 May 2018 01:04:36 jeremy youngs wrote:

> On Thu, May 24, 2018, 23:45 Gene Heskett  wrote:
> > On Thursday 24 May 2018 21:58:31 jeremy youngs wrote:
> > > Sorry, autocorrect,
> > >
> > > Heds 8950 encoder
> >
> > Its not an Omron then? I have used one before, in a project for the
> > tv station, never gave a hint of trouble. But I know nothing about a
> > HED 8950. I'll see if I can find something about it on the web.
> >
> > Looks like it may be an obsoleted model. Or, less of a chance, too
> > new for their catalog. It is not listed on the makers site. So my
> > best idea is to get an Omron from Ebay.  A dollar or so more than a
> > $20 bill, maybe $25 with shipping from someplace in the USA.
>
> Obsolete for sure, these are ametek tape drive motors , had a friend
> in Syracuse that had a 4 square foot electronics recycling center
> I got these from . Probably twenty to thirty years old. I'm searching
> for a 5/8 hole replacement now, I found some cui at mouser but we have
> had weather and my internet here in the Ozarks is almost non existent.
>
> > > > The 7i42TA's are that.  Limiting the current to a value below
> > > > the failure of the gates in the fpga on the 7i90HD.  IF you are
> > > > feeding them 5 volts.
> > > >
> > > > What diode are you referring to?
> > >
> > > The led that drives the optical encoder. It does not pass a diode
> > > check and
> > >
> > > > I am no longer able to see voltage changes on the a and b
> > > > encoder wires. So I figure I over currented the led .
> >
> > Thats what warranties are for. If you only fed it 5 volts on the red
> > wire, and it has now failed, its duff, send it back.
>
> I'm sure there is no warranty on these freebies.
>
> > OTOH, if its NOS and died, its a good chance the next one will be
> > the same age and well up the far end of the famous bathtub curve. 
> > I'd vote with my card, and get the Omron.
> >
> > Mounting is my biggest issue with this, and if I do I may as well
> > get six as that's eventually what will be needed. The good news is
> > my shop is about to be overloaded with Broken cars and we'll off
> > customers, the bad , once it starts next week I won't look up for a
> > month, then some concrete to pour and machine parts to buy, yep time
> > and money, the two are mutually exclusive to the working stiff.
> >
> > Oh, and if somebody is taking up a collection to round up this
> > Murphy guy...  It sucks just when progress was being made.
>
> Was able to verify pwm output with my radio shack multi meter with
> frequency counter, so while Murphy has stopped one thing , now it is
> to build an isolation supply and put these 28 volt 28 amp DC DC
> converters together and make the generic h bridge run these motors,
> and outfit all of the control works to an atx case I have laying
> around and gut the nema case that formerly housed stepper drives and
> control system.
>
> How long is tool long for this 50 pin cables? I understand the
> shortest the better but 2 foot would be great or would it be better to
> extend the db25 cable? Probably that one as it's only one cable.
>
I have 2 db25's on the g0704, so I can say that 4 feet doesn't seem to be 
a problem.  On the sheldon, the 50 pin cabless are about 4" long, with 
the 7i42TA's mounted on top of the 7i90 and the spi adapter and buss to 
the 7i90 is about an inch long. That bus runs at a 42 megabaud write, 
and a 25 megabaud read, so long cables aren't something I allowed to 
happen. But the short cable demanded the pi be heat sinked, with an old 
video card fan under it blowing up into the heat sinks. Zero stability 
problems. With no ups, uptime is usually from power failure to power 
failure, 65 days once.  

> > Take care, Jeremy.
>
> Always, and you too Gene.

-- 
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] Home switches.

[Gene Heskett]

On Thursday 24 May 2018 23:04:06 John Dammeyer wrote:

> Quick mini survey.  If you have a knee mill, where have you mounted
> your home switches?
> I understand it doesn't matter because the machine coordinate system
> is only used to establish a fixed reference.  For the rest of the time
> we use various world coordinate systems with the G54...
>
> So the switches:
> For the Y axis so the bed moves towards you or away?

I have mine set to trip about 50 thou from the front hard stop.

Actual home after it hits at high speed, then it backs away slow till the 
opens.
> For the X axis so the bed moves to the left or to the right?

I have that set to trip the switch when the table is about 50 thou from a 
hard stop. So the table is all the way left. If I've put a squirt of 
iso-68 Vactra on the ways, the long out and back moves while homing 
helps to distribute the oil.

> The Z axis obvious because we always want it to move away from the
> tool tip to avoid a crash.
>
And that is about 50 thou from the top of the post. I use home offsets to 
essentially center up the xy when the tables stop moving. No switch on 
the A, I simply run it to the zero index mark and touch it off. My 
biggest problem is the pointed tool 0 image, its out of time with the 
table by about 175 degrees.

> For example, if you periodically put your 4th Axis on the left hand
> side of the bed it's probably better to have the system home so the
> table moves to the left. In effect this makes the tool move to the
> right Just in case you ask it to home but forgot that you had the 4th
> axis bolted down.
>
> And that brings up the third question about a 4th axis.  If you have
> one, do you tend to put it on the left just like a lathe spindle or on
> the right? Any reason for the preference?  Often there are tool
> changers on the left so it makes more sense to have the 4th on the
> right.

Thats entirely up to you, John. With my drive motor sticking out at a 45 
degree angle it has to be on the left end of the table so the motor 
clears the head if its moved that far to the right. Its a long motor 
mount.  When its on the little mill, I drilled and tapped the table for 
the mount.

> Thanks
> John

-- 
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] 7i90 not listed in pnc

[jeremy youngs]

On Thu, May 24, 2018, 23:45 Gene Heskett  wrote:

> On Thursday 24 May 2018 21:58:31 jeremy youngs wrote:
>
> > Sorry, autocorrect,
> >
> > Heds 8950 encoder
>
> Its not an Omron then? I have used one before, in a project for the tv
> station, never gave a hint of trouble. But I know nothing about a HED
> 8950. I'll see if I can find something about it on the web.
>
> Looks like it may be an obsoleted model. Or, less of a chance, too new
> for their catalog. It is not listed on the makers site. So my best idea
> is to get an Omron from Ebay.  A dollar or so more than a $20 bill,
> maybe $25 with shipping from someplace in the USA.
>


Obsolete for sure, these are ametek tape drive motors , had a friend in
Syracuse that had a 4 square foot electronics recycling center I got
these from . Probably twenty to thirty years old. I'm searching for a 5/8
hole replacement now, I found some cui at mouser but we have had weather
and my internet here in the Ozarks is almost non existent.

>
> > > The 7i42TA's are that.  Limiting the current to a value below the
> > > failure of the gates in the fpga on the 7i90HD.  IF you are feeding
> > > them 5 volts.
> > >
> > > What diode are you referring to?
> >
> > The led that drives the optical encoder. It does not pass a diode
> > check and
> >
> > > I am no longer able to see voltage changes on the a and b encoder
> > > wires. So I figure I over currented the led .
> >
> Thats what warranties are for. If you only fed it 5 volts on the red
> wire, and it has now failed, its duff, send it back.
>
I'm sure there is no warranty on these freebies.

>
> OTOH, if its NOS and died, its a good chance the next one will be the
> same age and well up the far end of the famous bathtub curve.  I'd vote
> with my card, and get the Omron.
>
> Mounting is my biggest issue with this, and if I do I may as well get six
> as that's eventually what will be needed. The good news is my shop is about
> to be overloaded with Broken cars and we'll off customers, the bad , once
> it starts next week I won't look up for a month, then some concrete to pour
> and machine parts to buy, yep time and money, the two are mutually
> exclusive to the working stiff.
>
> Oh, and if somebody is taking up a collection to round up this Murphy
> guy...  It sucks just when progress was being made.
>
Was able to verify pwm output with my radio shack multi meter with
frequency counter, so while Murphy has stopped one thing , now it is to
build an isolation supply and put these 28 volt 28 amp DC DC converters
together and make the generic h bridge run these motors, and outfit all of
the control works to an atx case I have laying around and gut the nema case
that formerly housed stepper drives and control system.

How long is tool long for this 50 pin cables? I understand the shortest the
better but 2 foot would be great or would it be better to extend the db25
cable? Probably that one as it's only one cable.

>
> Take care, Jeremy.
>

Always, and you too Gene.

>
> --
> 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 
>
>
> --
> 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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> https://lists.sourceforge.net/lists/listinfo/emc-users
>
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Re: [Emc-users] 7i90 not listed in pnc

[jeremy youngs]

On Thu, May 24, 2018, 23:33 Ralph Stirling 
wrote:

> Electronics component date codes are always two digit year
> followed by two digit week.
>

Learn something every day

>
> I did not do anything intentional about trimming my reply,
> just top posted.  My mail reader (outlook web access) doesn't
> do the ">" quoting.
>
Ok, at least I know 🤣🤣

>
> Hope you can find a replacement for the whole encoder, because
> that module doesn't look like the standard HP/Avago type.
>

Me too 
>


-- Ralph
>
> 
> From: jeremy youngs [jcyoung...@gmail.com]
> Sent: Thursday, May 24, 2018 9:01 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] 7i90 not listed in pnc
>
> On Thu, May 24, 2018, 22:32 Ralph Stirling 
> wrote:
>
> > I suspect that module was manufactured in the 50th week of 1989, as 8950
> > looks like a date code.  I don't see a normal part number, unless it is
> the
> > OPB number.
> >
>
> I would suspect a Julian date code of day of the year i.e 264 then a year
> specifier , i.e. 2649 being the 264 day in the 9 the year of decade , that
> is how most things I have ever experienced lot and batch coding worked,
> regardless I'm having no luck finding anyone that stocks it or the avago
> that Jon spoke of. And do appreciate your in put Ralph.
>
> What I really want to know is how you trimmed this 100 page post. I have
> left it long as it's been a thread that went all the way to a 7i90 working
> so I haven't broken it up( well and obviously I don't know how to break it
> up 😁😁😁). It maybe time to do that though as I'm very happy to say it all
> just works 😂😂😂 and now it's about hardware issues.
>
> >
> > -- Ralph
> >
> > On May 24, 2018 7:09 PM, jeremy youngs  wrote:
> > >
> > >
> > >
> > > HEDS 8950?
> > >
> > > That seems to be an alignment tool, not an encoder...
> > >
> > > The optical encoder says 8950 I found a datasheet that said obsolete in
> > > Nov 2011
> > >
> > >
> > >
> > >
> >   8950.jpg
> > <
> >
> https://drive.google.com/file/d/1l1S6QMRvlKNLQNbT9GYOcLkHmogDqKEr/view?usp=drivesdk
> > >
> > This is what I got.
> > Also wanted to say thank you all for the help
> >
> >
> --
> > 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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> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>
> --
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Re: [Emc-users] 7i90 not listed in pnc

[Gene Heskett]

On Thursday 24 May 2018 21:58:31 jeremy youngs wrote:

> Sorry, autocorrect,
>
> Heds 8950 encoder

Its not an Omron then? I have used one before, in a project for the tv 
station, never gave a hint of trouble. But I know nothing about a HED 
8950. I'll see if I can find something about it on the web.

Looks like it may be an obsoleted model. Or, less of a chance, too new 
for their catalog. It is not listed on the makers site. So my best idea 
is to get an Omron from Ebay.  A dollar or so more than a $20 bill, 
maybe $25 with shipping from someplace in the USA. 

> > The 7i42TA's are that.  Limiting the current to a value below the
> > failure of the gates in the fpga on the 7i90HD.  IF you are feeding
> > them 5 volts.
> >
> > What diode are you referring to?
>
> The led that drives the optical encoder. It does not pass a diode
> check and
>
> > I am no longer able to see voltage changes on the a and b encoder
> > wires. So I figure I over currented the led .
>
Thats what warranties are for. If you only fed it 5 volts on the red 
wire, and it has now failed, its duff, send it back.

OTOH, if its NOS and died, its a good chance the next one will be the 
same age and well up the far end of the famous bathtub curve.  I'd vote 
with my card, and get the Omron.

Oh, and if somebody is taking up a collection to round up this Murphy 
guy...  It sucks just when progress was being made.

Take care, Jeremy.

-- 
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] 7i90 not listed in pnc

[Ralph Stirling]

Electronics component date codes are always two digit year
followed by two digit week.

I did not do anything intentional about trimming my reply,
just top posted.  My mail reader (outlook web access) doesn't
do the ">" quoting.

Hope you can find a replacement for the whole encoder, because
that module doesn't look like the standard HP/Avago type.

-- Ralph


From: jeremy youngs [jcyoung...@gmail.com]
Sent: Thursday, May 24, 2018 9:01 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] 7i90 not listed in pnc

On Thu, May 24, 2018, 22:32 Ralph Stirling 
wrote:

> I suspect that module was manufactured in the 50th week of 1989, as 8950
> looks like a date code.  I don't see a normal part number, unless it is the
> OPB number.
>

I would suspect a Julian date code of day of the year i.e 264 then a year
specifier , i.e. 2649 being the 264 day in the 9 the year of decade , that
is how most things I have ever experienced lot and batch coding worked,
regardless I'm having no luck finding anyone that stocks it or the avago
that Jon spoke of. And do appreciate your in put Ralph.

What I really want to know is how you trimmed this 100 page post. I have
left it long as it's been a thread that went all the way to a 7i90 working
so I haven't broken it up( well and obviously I don't know how to break it
up 😁😁😁). It maybe time to do that though as I'm very happy to say it all
just works 😂😂😂 and now it's about hardware issues.

>
> -- Ralph
>
> On May 24, 2018 7:09 PM, jeremy youngs  wrote:
> >
> >
> >
> > HEDS 8950?
> >
> > That seems to be an alignment tool, not an encoder...
> >
> > The optical encoder says 8950 I found a datasheet that said obsolete in
> > Nov 2011
> >
> >
> >
> >
>   8950.jpg
> <
> https://drive.google.com/file/d/1l1S6QMRvlKNLQNbT9GYOcLkHmogDqKEr/view?usp=drivesdk
> >
> This is what I got.
> Also wanted to say thank you all for the help
>
> --
> 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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> 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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Re: [Emc-users] Home switches.

[jeremy youngs]

Home switches should go to the positive side , z up, y towards you and x on
the right.
Most 4 axis I have used were mounted on the negative end ( left ) ( mazak)
but the carousel was not in the path of the 4th axis, the fadals ( which
homed to the center of the table , as well as the daewoo) were mounted to
the right because the carousel would have been an interfering factor, mine
will mount to the right because it will be a threaded lathe spindle ( in
stock ) and I don't want it throwing chips at me or unscrewing, but I have
other hurdles to jump before adding more joints to this machine 😀😀😀

On Thu, May 24, 2018, 22:05 John Dammeyer  wrote:

> Quick mini survey.  If you have a knee mill, where have you mounted your
> home switches?
> I understand it doesn't matter because the machine coordinate system is
> only
> used to establish a fixed reference.  For the rest of the time we use
> various world coordinate systems with the G54...
>
> So the switches:
> For the Y axis so the bed moves towards you or away?
> For the X axis so the bed moves to the left or to the right?
> The Z axis obvious because we always want it to move away from the tool tip
> to avoid a crash.
>
> For example, if you periodically put your 4th Axis on the left hand side of
> the bed it's probably better to have the system home so the table moves to
> the left. In effect this makes the tool move to the right Just in case you
> ask it to home but forgot that you had the 4th axis bolted down.
>
> And that brings up the third question about a 4th axis.  If you have one,
> do
> you tend to put it on the left just like a lathe spindle or on the right?
> Any reason for the preference?  Often there are tool changers on the left
> so
> it makes more sense to have the 4th on the right.
>
> Thanks
> John
>
>
>
>
>
>
> --
> 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] 7i90 not listed in pnc

[jeremy youngs]

On Thu, May 24, 2018, 22:32 Ralph Stirling 
wrote:

> I suspect that module was manufactured in the 50th week of 1989, as 8950
> looks like a date code.  I don't see a normal part number, unless it is the
> OPB number.
>

I would suspect a Julian date code of day of the year i.e 264 then a year
specifier , i.e. 2649 being the 264 day in the 9 the year of decade , that
is how most things I have ever experienced lot and batch coding worked,
regardless I'm having no luck finding anyone that stocks it or the avago
that Jon spoke of. And do appreciate your in put Ralph.

What I really want to know is how you trimmed this 100 page post. I have
left it long as it's been a thread that went all the way to a 7i90 working
so I haven't broken it up( well and obviously I don't know how to break it
up 😁😁😁). It maybe time to do that though as I'm very happy to say it all
just works 😂😂😂 and now it's about hardware issues.

>
> -- Ralph
>
> On May 24, 2018 7:09 PM, jeremy youngs  wrote:
> >
> >
> >
> > HEDS 8950?
> >
> > That seems to be an alignment tool, not an encoder...
> >
> > The optical encoder says 8950 I found a datasheet that said obsolete in
> > Nov 2011
> >
> >
> >
> >
>   8950.jpg
> <
> https://drive.google.com/file/d/1l1S6QMRvlKNLQNbT9GYOcLkHmogDqKEr/view?usp=drivesdk
> >
> This is what I got.
> Also wanted to say thank you all for the help
>
> --
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Re: [Emc-users] 7i90 not listed in pnc

[Ralph Stirling]

I suspect that module was manufactured in the 50th week of 1989, as 8950 looks 
like a date code.  I don't see a normal part number, unless it is the OPB 
number.

-- Ralph

On May 24, 2018 7:09 PM, jeremy youngs  wrote:
>
>
>
> HEDS 8950?
>
> That seems to be an alignment tool, not an encoder...
>
> The optical encoder says 8950 I found a datasheet that said obsolete in
> Nov 2011
>
>
>
>
  8950.jpg

This is what I got.
Also wanted to say thank you all for the help
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[Emc-users] Home switches.

[John Dammeyer]

Quick mini survey.  If you have a knee mill, where have you mounted your
home switches?
I understand it doesn't matter because the machine coordinate system is only
used to establish a fixed reference.  For the rest of the time we use
various world coordinate systems with the G54...

So the switches:
For the Y axis so the bed moves towards you or away?
For the X axis so the bed moves to the left or to the right?
The Z axis obvious because we always want it to move away from the tool tip
to avoid a crash.

For example, if you periodically put your 4th Axis on the left hand side of
the bed it's probably better to have the system home so the table moves to
the left. In effect this makes the tool move to the right Just in case you
ask it to home but forgot that you had the 4th axis bolted down.

And that brings up the third question about a 4th axis.  If you have one, do
you tend to put it on the left just like a lathe spindle or on the right?
Any reason for the preference?  Often there are tool changers on the left so
it makes more sense to have the 4th on the right.

Thanks
John





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Re: [Emc-users] 7i90 not listed in pnc

[jeremy youngs]

>
>
>
> HEDS 8950?
>
> That seems to be an alignment tool, not an encoder...
>
> The optical encoder says 8950 I found a datasheet that said obsolete in
> Nov 2011
>
>
>
>
  8950.jpg

This is what I got.
Also wanted to say thank you all for the help
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Re: [Emc-users] 7i90 not listed in pnc

[Jon Elson]

On 05/24/2018 07:57 PM, Gene Heskett wrote:

On Thursday 24 May 2018 16:52:17 jeremy youngs wrote:


Ok, I got this all loaded , got some help from Peter and am able to
drop these pins to ground and watch encoder raw count show pin
activity. So , great everything works, very Happy. The bad  I
think I reverse biased this led and popped it. I have another encoder
and motor to try to read counts on. The real question, this is a heads
8950 and it shows eol as Nov 2011 and I cannot locate a source for a
replacement. Which would be great as the omron encoders are in China
and will require fabrication to install. Any recommendations?

I am lost at "heads 8950".  Whats that?


HEDS is a line of old HP encoders, now sold by Avago.  You 
can look them up on Digi-Key, there are probably over a 
thousand combinations of encoder wheels, read heads and covers.


There are other units with different 4-letter part numbers 
that have more channels, differential outputs, special 
housings, etc.


A few other makers also make form-compatible encoders with 
the HEDS part number, which MAY be compatible with the HP 
part #'s.


Jon

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Re: [Emc-users] 7i90 not listed in pnc

[jeremy youngs]

Sorry, autocorrect,
>
Heds 8950 encoder


> The 7i42TA's are that.  Limiting the current to a value below the failure
> of the gates in the fpga on the 7i90HD.  IF you are feeding them 5
> volts.
>
> What diode are you referring to?
>

The led that drives the optical encoder. It does not pass a diode check and
> I am no longer able to see voltage changes on the a and b encoder wires. So
> I figure I over currented the led .
>
>
>
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Re: [Emc-users] 7i90 not listed in pnc

[Gene Heskett]

On Thursday 24 May 2018 16:52:17 jeremy youngs wrote:

> Ok, I got this all loaded , got some help from Peter and am able to
> drop these pins to ground and watch encoder raw count show pin
> activity. So , great everything works, very Happy. The bad  I
> think I reverse biased this led and popped it. I have another encoder
> and motor to try to read counts on. The real question, this is a heads
> 8950 and it shows eol as Nov 2011 and I cannot locate a source for a
> replacement. Which would be great as the omron encoders are in China
> and will require fabrication to install. Any recommendations?

I am lost at "heads 8950".  Whats that?

> Also I figured a 5 volt 700 ma regulated supply wouldn't have popped
> the diode should this have current limit resistors in line?

The 7i42TA's are that.  Limiting the current to a value below the failure 
of the gates in the fpga on the 7i90HD.  IF you are feeding them 5 
volts.

What diode are you referring to?

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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] 7i90 not listed in pnc

[andy pugh]

On 24 May 2018 at 21:52, jeremy youngs  wrote:
> The real question, this is a heads 8950 and it shows eol as Nov
> 2011 and I cannot locate a source for a replacement.

HEDS 8950?

That seems to be an alignment tool, not an encoder...


-- 
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] 7i90 not listed in pnc

[jeremy youngs]

Ok, I got this all loaded , got some help from Peter and am able to drop
these pins to ground and watch encoder raw count show pin activity. So ,
great everything works, very Happy. The bad  I think I reverse biased
this led and popped it. I have another encoder and motor to try to read
counts on. The real question, this is a heads 8950 and it shows eol as Nov
2011 and I cannot locate a source for a replacement. Which would be great
as the omron encoders are in China and will require fabrication to install.
Any recommendations?

Also I figured a 5 volt 700 ma regulated supply wouldn't have popped the
diode should this have current limit resistors in line?
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Re: [Emc-users] 7i90 not listed in pnc

[jeremy youngs]

On Thu, May 24, 2018, 01:36 Gene Heskett  wrote:

>
>
> Sounds like no threads running.
>
> Does a "halrun" execute,(see the doc pdf, about page 585) and give you
> a "halcmd" prompt? Or alternatively, does linuxcnc actually run?

Yes,yes

The

>
> first time it will ask you for a configuration, which you should pass
> its new config, you've created
> in /home/$usr/linuxcnc/configs/$new-name.ini
>
So the path to my ini file $usr changed for user name and $new name = servo
matson

>
> After that run, you can select that config automatically with linuxcnc -l
>


So if I start, then shutdown linuxcnc the -i will load the 7i90 file and I
> won't have to punch all of the configuration string ( that I'm admittedly
> not sure of correct syntax and path for ) and it should load and halscop
> should then allow me to choose threads and pins.
>

I will attempt this in the afternoon.

where the -l stands for same as Last time. There may be config *.ini or
> *.hal errors that cause an immediate exit, expected at this stage.
>
We have debugged all of this and it works.

>
> dmesg will show any logged errors. To simplify its display, run as root
> 'dmesg -c' to clear its history, the rerun linuxcnc, then just dmesg to
> get only the errors of this run attempt.  Paste those back to us.



Back at shop with no internet , this will be a bit difficult


>
>
> the first thing to do is figure out why not
>
Agreed

>
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Re: [Emc-users] Water or Air cooled spindles

[Gene Heskett]

On Thursday 24 May 2018 08:28:33 Kenneth Lerman wrote:

> It sounds to me like a car radiator from a junked car would make a
> perfect cooling tank and heat radiator.
>
> Ken
>
Thats a good idea, or one could get a heater core out of the junk yard, 
with a fan  blowing thru it for even more space savings.

More years ago, in my 20's, I did that for a water cooled go kart engine. 
An old gopher frame, with 2, 2 gallon tanks mounted one on each side, 
one carried water and one carried the fuel I was burning at the time, 
either gas or booze & castor oil. With the radiator, a core from an old 
nash mounted under a panel on the steering column so the hot air exited 
thru the bottom of the frame. No fan just the fwd motion of up to 120 
mph for air flow. Needed a bigger water pump, the flow was so low exit 
water was ambient temp while the water in the tank was boiling by the 
end of a 25 lap heat race. Fun days. But not truly competitive, theres 
only so much hp you can coax out of a surplus 1937 bilge pump, which was 
a 10hp johnson/evinrude engine turned horizontal. Rotary valve intake , 
all bearings hard but a deflector head design so it was all done at 7500 
revs. With lots more carb than the oem version, burning booze, maybe 25 
hp on a good evening, but at 13 cu in and water cooled it was 
automatically in the C Super class, and some of the tripled Mc's were 
making 40+ hp, on a frame 25 lbs lighter. But I had pure fun doing it.

Side comment, such experience at the bleeding edge of traction, steering 
with the throttle will make you a better driver when the excrement hits 
the fan and most folks will lose control. At 83, I have a fav corner I 
hit at about 65, drifting an 8000 lb ford pickup with the rear end 
hanging out about 18", just to keep in practice for SHTF situations.

It also applies to two wheels, as Andy knows well.
  
> On Wed, May 23, 2018 at 8:01 AM, Dave Cole  
wrote:
> > RV antifreeze works well for things like this.  I have been using it
> > for years in my bandsaw coolant tank.  It doesn't seem to go bad
> > even after years and it doesn't evaporate much.
> >
> > For cooling, You might want to consider making a flat tank.  Two
> > sheets of steel or alum spaced apart an inch or so and welded at the
> > edges.   That would increase your surface area for cooling while not
> > creating a huge tank volume wise.  Put the tank on edge and it won't
> > take up much space.
> >
> > On 5/22/2018 5:34 PM, Bruce Layne wrote:
> >> I've had two of the Chinese 2.2 KW water cooled spindles for the
> >> last few years and have had no trouble with them.  I consider them
> >> to be a good value.  Well worth the plumbing hassle, in my opinion.
> >>
> >> Be sure to use good quality very flexible tubing of the correct
> >> size.  I think I got 8mm outside diameter tubing from McMaster-Carr
> >> (red for supply and blue for return).  I use pink RV antifreeze as
> >> the coolant.  It's used full strength and not diluted.  I use it in
> >> the hope that it's less corrosive than water.  Neither machine's
> >> coolant has had any rust or other issues, although there was a
> >> slight film of oil that's flushed out of the spindle motor.  I'm
> >> not worried about it freezing because one of the CNC routers is in
> >> an attached garage and the other is in my basement, and neither get
> >> very cold.  I'd actually be more worried about the machine rusting
> >> if it was in a condensing environment, and the CNC routers are
> >> mostly aluminum.
> >>
> >> I mounted a thin liquid crystal thermometer on the spindle facing
> >> the operator so I can tell at a glance if the spindle overheats.
> >> These liquid crystal strip thermometers are readily available on
> >> eBay and are sold for reptile terrariums.  I buy a bunch of them
> >> and put them in electrical panels, etc.
> >>
> >> I haven't finished wiring it yet, but the production machine will
> >> have a 130F bimetallic button thermal switch siliconed to the
> >> spindle motor housing and wired into the e-stop circuit to shut
> >> everything down if the spindle overheats.
> >>
> >> The Huanyang VFD produces a lot of electrical noise, apparently
> >> mostly radiated.  I used ultra flexible shielded four conductor
> >> cable (three phases plus ground) to keep the cable from radiating
> >> much energy.  The only place I had an RFI problem was the VGA
> >> monitor and a good quality VGA cable fixed that problem.
> >>
> >> On the larger router, I tried to place a five gallon coolant tank
> >> under the router and pump the coolant up and then back down to the
> >> spindle motor.  I was partly motivated by not wanting a leak that
> >> siphoned the five gallon coolant tank empty.  After some
> >> experimentation, I gave up and put the coolant tank on top of the
> >> CNC router enclosure.  When it was underneath, I needed to use such
> >> a large pump to have enough pressure to pump the coolant six feet
> >> vertically that the submerged coolant pump was heating the coo

Re: [Emc-users] Water or Air cooled spindles

[Dave Cole]

Great idea... in fact I think I will use that idea to cool my TIG 
welding torch!  :-)    A radiator from a compact car should be cheap at 
the junk yard.

It might even come with an electric fan if I ask for it!

Dave

On 5/24/2018 8:28 AM, Kenneth Lerman wrote:

It sounds to me like a car radiator from a junked car would make a perfect
cooling tank and heat radiator.

Ken

On Wed, May 23, 2018 at 8:01 AM, Dave Cole  wrote:


RV antifreeze works well for things like this.  I have been using it for
years in my bandsaw coolant tank.  It doesn't seem to go bad even after
years and it doesn't evaporate much.

For cooling, You might want to consider making a flat tank.  Two sheets of
steel or alum spaced apart an inch or so and welded at the edges.   That
would increase your surface area for cooling while not creating a huge tank
volume wise.  Put the tank on edge and it won't take up much space.


On 5/22/2018 5:34 PM, Bruce Layne wrote:


I've had two of the Chinese 2.2 KW water cooled spindles for the last few
years and have had no trouble with them.  I consider them to be a good
value.  Well worth the plumbing hassle, in my opinion.

Be sure to use good quality very flexible tubing of the correct size.  I
think I got 8mm outside diameter tubing from McMaster-Carr (red for supply
and blue for return).  I use pink RV antifreeze as the coolant.  It's used
full strength and not diluted.  I use it in the hope that it's less
corrosive than water.  Neither machine's coolant has had any rust or other
issues, although there was a slight film of oil that's flushed out of the
spindle motor.  I'm not worried about it freezing because one of the CNC
routers is in an attached garage and the other is in my basement, and
neither get very cold.  I'd actually be more worried about the machine
rusting if it was in a condensing environment, and the CNC routers are
mostly aluminum.

I mounted a thin liquid crystal thermometer on the spindle facing the
operator so I can tell at a glance if the spindle overheats. These liquid
crystal strip thermometers are readily available on eBay and are sold for
reptile terrariums.  I buy a bunch of them and put them in electrical
panels, etc.

I haven't finished wiring it yet, but the production machine will have a
130F bimetallic button thermal switch siliconed to the spindle motor
housing and wired into the e-stop circuit to shut everything down if the
spindle overheats.

The Huanyang VFD produces a lot of electrical noise, apparently mostly
radiated.  I used ultra flexible shielded four conductor cable (three
phases plus ground) to keep the cable from radiating much energy.  The only
place I had an RFI problem was the VGA monitor and a good quality VGA cable
fixed that problem.

On the larger router, I tried to place a five gallon coolant tank under
the router and pump the coolant up and then back down to the spindle
motor.  I was partly motivated by not wanting a leak that siphoned the five
gallon coolant tank empty.  After some experimentation, I gave up and put
the coolant tank on top of the CNC router enclosure.  When it was
underneath, I needed to use such a large pump to have enough pressure to
pump the coolant six feet vertically that the submerged coolant pump was
heating the coolant more than the spindle.  It was a spindle heater, not a
spindle cooler.

We're finally ramping up production, with some programs running
unattended for ten hours.  I'm going to need to add a radiator in the
coolant return line and a couple of muffin fans to keep the coolant
temperature low enough.  The other alternative might be ten or fifteen more
gallons of coolant to increase the thermal mass, but that seems to only
delay the overheating problem with greater risk of a severe coolant leak.






On 05/22/2018 03:18 PM, Roland Jollivet wrote:


I'm looking at getting one of those 2.2kW air or water cooled spindles +
VFD kits out there for a router.
I'm not worried about the noise difference between the two types.

Has anyone taken apart a water cooled spindle?
How are they doing the cooling? Is it a water jacket or just some copper
tubing inside?
How likely is it to leak in a few months time?
I can only find one video describing leaks and water related shorts etc.
(so they must be good?)

I actually prefer the idea of using air-cooled and making ducting to take
the exhaust away from the spindle nose. Make a closed loop fan-assisted
air
duct.
The irony is that I want to use flood cooling on the work. (composite
material)  So it won't be a dry environment.

Regards
Roland
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-

Re: [Emc-users] Water or Air cooled spindles

[Kenneth Lerman]

It sounds to me like a car radiator from a junked car would make a perfect
cooling tank and heat radiator.

Ken

On Wed, May 23, 2018 at 8:01 AM, Dave Cole  wrote:

> RV antifreeze works well for things like this.  I have been using it for
> years in my bandsaw coolant tank.  It doesn't seem to go bad even after
> years and it doesn't evaporate much.
>
> For cooling, You might want to consider making a flat tank.  Two sheets of
> steel or alum spaced apart an inch or so and welded at the edges.   That
> would increase your surface area for cooling while not creating a huge tank
> volume wise.  Put the tank on edge and it won't take up much space.
>
>
> On 5/22/2018 5:34 PM, Bruce Layne wrote:
>
>> I've had two of the Chinese 2.2 KW water cooled spindles for the last few
>> years and have had no trouble with them.  I consider them to be a good
>> value.  Well worth the plumbing hassle, in my opinion.
>>
>> Be sure to use good quality very flexible tubing of the correct size.  I
>> think I got 8mm outside diameter tubing from McMaster-Carr (red for supply
>> and blue for return).  I use pink RV antifreeze as the coolant.  It's used
>> full strength and not diluted.  I use it in the hope that it's less
>> corrosive than water.  Neither machine's coolant has had any rust or other
>> issues, although there was a slight film of oil that's flushed out of the
>> spindle motor.  I'm not worried about it freezing because one of the CNC
>> routers is in an attached garage and the other is in my basement, and
>> neither get very cold.  I'd actually be more worried about the machine
>> rusting if it was in a condensing environment, and the CNC routers are
>> mostly aluminum.
>>
>> I mounted a thin liquid crystal thermometer on the spindle facing the
>> operator so I can tell at a glance if the spindle overheats. These liquid
>> crystal strip thermometers are readily available on eBay and are sold for
>> reptile terrariums.  I buy a bunch of them and put them in electrical
>> panels, etc.
>>
>> I haven't finished wiring it yet, but the production machine will have a
>> 130F bimetallic button thermal switch siliconed to the spindle motor
>> housing and wired into the e-stop circuit to shut everything down if the
>> spindle overheats.
>>
>> The Huanyang VFD produces a lot of electrical noise, apparently mostly
>> radiated.  I used ultra flexible shielded four conductor cable (three
>> phases plus ground) to keep the cable from radiating much energy.  The only
>> place I had an RFI problem was the VGA monitor and a good quality VGA cable
>> fixed that problem.
>>
>> On the larger router, I tried to place a five gallon coolant tank under
>> the router and pump the coolant up and then back down to the spindle
>> motor.  I was partly motivated by not wanting a leak that siphoned the five
>> gallon coolant tank empty.  After some experimentation, I gave up and put
>> the coolant tank on top of the CNC router enclosure.  When it was
>> underneath, I needed to use such a large pump to have enough pressure to
>> pump the coolant six feet vertically that the submerged coolant pump was
>> heating the coolant more than the spindle.  It was a spindle heater, not a
>> spindle cooler.
>>
>> We're finally ramping up production, with some programs running
>> unattended for ten hours.  I'm going to need to add a radiator in the
>> coolant return line and a couple of muffin fans to keep the coolant
>> temperature low enough.  The other alternative might be ten or fifteen more
>> gallons of coolant to increase the thermal mass, but that seems to only
>> delay the overheating problem with greater risk of a severe coolant leak.
>>
>>
>>
>>
>>
>>
>> On 05/22/2018 03:18 PM, Roland Jollivet wrote:
>>
>>> I'm looking at getting one of those 2.2kW air or water cooled spindles +
>>> VFD kits out there for a router.
>>> I'm not worried about the noise difference between the two types.
>>>
>>> Has anyone taken apart a water cooled spindle?
>>> How are they doing the cooling? Is it a water jacket or just some copper
>>> tubing inside?
>>> How likely is it to leak in a few months time?
>>> I can only find one video describing leaks and water related shorts etc.
>>> (so they must be good?)
>>>
>>> I actually prefer the idea of using air-cooled and making ducting to take
>>> the exhaust away from the spindle nose. Make a closed loop fan-assisted
>>> air
>>> duct.
>>> The irony is that I want to use flood cooling on the work. (composite
>>> material)  So it won't be a dry environment.
>>>
>>> Regards
>>> Roland
>>> --
>>>
>>> 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
>>>
>>>
>>>
>>
>> -

Re: [Emc-users] 7i90 not listed in pnc

[andy pugh]

On 24 May 2018 at 02:33, jeremy youngs  wrote:
> Pin 1 and 3 are my a and b from the 7i42.
> I have verified encoder is operational and 4.56 volts at pins 1&2 on 7i42
> so all seems good there. I'm pretty sure this is a syntax problem . Input ?
>   hal.jpg
> 

Halrun starts a new HAL session, you need to loadrt hostmot2 /
hm2_7i90 / threads every time, then addf the functions to the thread
and start the thread.

You can put all the setup in a little halfile if you want, and then use

halrun -I test.hal

to save typing it all in every time. That's a capital "i" and means
"start an interactive HAL session after running the HAL file"

Halmeter won't have any pins to meter if you don't load the 7i90 driver.

-- 
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"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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