Re: [Emc-users] linux cnc servo interface help

[linden]

> The DYN4 can run in analogue-controlled velocity mode. That might be
> worth considering.
> It probably doesn't work any better than running the loop in the
> drive, but it is easier to see what the loop is doing.
>
> (Actually, it might also work better, as there is the possibility of
> using velocity feed-forward)
>

Thanks Andi,

Using Analogue velocity mode  what would be the simplest way to get the 
signals from the servo drive in and out of Linuxcnc???  A mesa 7i77 or 
something similar?

Using velocity mode would also simplify things as i could uses similar 
hardware to interface with a spindle motor some where down the road.

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Re: [Emc-users] Haas thoughts

[Gregg Eshelman]

Look on the back of the keyboard for microchips, or on a board that the 
keyboard connects to. Google the numbers to see what they are.

I'd thought about hoking up the keyboard from the Anilam Crusader 2 system that 
was on my big mill. Shouldn't have been too difficult since a cable went from 
the keyboard to another small board with a matrix to RS232C chip. Would have 
mostly been figuring out the pinout of the header on the adapter board then 
setting up a text editor to take input from a COM port, then poking every 
button to see what characters it sent.

 
  From: Erik Friesen 
 To: Enhanced Machine Controller (EMC)  
 Sent: Tuesday, October 11, 2016 6:59 AM
 Subject: [Emc-users] Haas thoughts
   
Are any of these items valid any more?

http://blog.cnccookbook.com/2014/12/16/10-features-pros-hobby-cnc-controllers-dont/

What would it take (software wise) to fully integrate a haas keypad so that
most of the functions would be usable?  The ones I see as a challenge are
items like Posit, Offset, and all the edit functions.

Reference keypad http://aercon.net/Public/HaasKeyboard.jpg
   
 
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Re: [Emc-users] Haas thoughts

[Peter C. Wallace]

On Tue, 11 Oct 2016, Erik Friesen wrote:


Date: Tue, 11 Oct 2016 19:06:33 -0400
From: Erik Friesen 
Reply-To: "Enhanced Machine Controller (EMC)"

To: "Enhanced Machine Controller (EMC)" 
Subject: Re: [Emc-users] Haas thoughts

So how does the drive know how much pwm to give the motors?  Or that

depends on the a and b levels in that case?

Yes, normally these set the three phase angle and current

The controller that outputs these signals must of course get its 
reference (rotor) phase angle from an encoder of some type (hall effect/ 
absolute encoder/resolver/ quadrature encoder + simulated hall etc etc)



On Tue, Oct 11, 2016 at 6:56 PM, Erik Friesen  wrote:


That is the pinout between the control and the drive.  The drive doesn't
have any direct encoder input.

On Tue, Oct 11, 2016 at 6:33 PM, andy pugh  wrote:


On 11 October 2016 at 23:24, Erik Friesen  wrote:
> omehow these amps have to figure power and
> location for the bldc phase,

Is that the pinout between the motors and the drive? Or is it the
control signal to the drive?

--
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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Mesa Electronics

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Re: [Emc-users] Haas thoughts

[Erik Friesen]

So how does the drive know how much pwm to give the motors?  Or that
depends on the a and b levels in that case?

On Tue, Oct 11, 2016 at 6:56 PM, Erik Friesen  wrote:

> That is the pinout between the control and the drive.  The drive doesn't
> have any direct encoder input.
>
> On Tue, Oct 11, 2016 at 6:33 PM, andy pugh  wrote:
>
>> On 11 October 2016 at 23:24, Erik Friesen  wrote:
>> > omehow these amps have to figure power and
>> > location for the bldc phase,
>>
>> Is that the pinout between the motors and the drive? Or is it the
>> control signal to the drive?
>>
>> --
>> 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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>> 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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>
>
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Re: [Emc-users] Haas thoughts

[Erik Friesen]

That is the pinout between the control and the drive.  The drive doesn't
have any direct encoder input.

On Tue, Oct 11, 2016 at 6:33 PM, andy pugh  wrote:

> On 11 October 2016 at 23:24, Erik Friesen  wrote:
> > omehow these amps have to figure power and
> > location for the bldc phase,
>
> Is that the pinout between the motors and the drive? Or is it the
> control signal to the drive?
>
> --
> 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
>
> 
> --
> 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] Haas thoughts

[Peter C. Wallace]

On Tue, 11 Oct 2016, Erik Friesen wrote:

> Date: Tue, 11 Oct 2016 18:24:36 -0400
> From: Erik Friesen 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: Greg Bentzinger ,
> "Enhanced Machine Controller (EMC)" 
> Subject: Re: [Emc-users] Haas thoughts
> 
> The pinout coming from the brushless amps is
>
> 610-1 +A CHANNEL
> 610-2 ANALOG GROUND
> 610-3 +B CHANNEL
> 610-4 ANALOG GROUND
> 610-5 ENABLE
> 610-6 LOGIC GROUND
> 610-7 FAULT
> 610-8 LOGIC GROUND
> 610-9 NOT USED
> 610-10 SHIELD/ANALOG GROUND

That looks very similar to the drive signals for AMCs analog input AC servo 
drives: 2 phase analog sine wave drive (phase C is just the difference between 
A and B so synthesized in the drive)


>
> Any ideas what signal levels and types those will be?  The encoders feed
> through the mocon pcb, so somehow these amps have to figure power and
> location for the bldc phase, and I don't see how that is accomplished.
>
> On Tue, Oct 11, 2016 at 3:29 PM, Erik Friesen  wrote:
>
>> My haas is a 1996 and it shows.  Attempting 0.1" engraving at 40ipm G187
>> E.001 doesn't work, and I think it is a control limitation.  See two paths
>> in this pic?  aercon.net/Public/Engraving.jpg  The top is attempted at 40
>> IPM, the bottom at 15.  To me it looks like a trajectory planning
>> limitation.
>>
>> The only person to attempt a haas vf conversion never finished it.
>>
>> On Tue, Oct 11, 2016 at 3:03 PM, Greg Bentzinger 
>> wrote:
>>
>>> Perspective on anything read on cnccookbook.com
>>>
>>> Keep in mind that site exists to promote his software and his articles
>>> are written by someone who does not have long term (if any) experience with
>>> "Big Iron" in an industrial business environment.
>>>
>>> His opinions are biased towards the hobby/semi-pro market as that is the
>>> best he knows. Some info offers keen insights, while others are plain
>>> wrong. His software can be helpful if you are willing to make a windows PC
>>> with internet connection available to employees on the floor. ( Network
>>> connection is required so software can phone home to validate your
>>> subscription license.)
>>>
>>> Personally I use the other (competitor) option which has a Buy once cry
>>> once license option and is cross platform so it will run on my Android
>>> phone as well as PC.
>>>
>>> I know there are a very large group who loves the HAAS control, I
>>> however, after having to try and keep 8 lathes and 3 mills running and knew
>>> my Haas repair crew better than any other vendor, so I'm definitely not one
>>> of those fan boys. I like toggle switches and rotary knobs I can see status
>>> from 10m or yrds away. Plus tapping a membrane key to increment up or down
>>> a feed rate or spindle speed seems just wrong on a full sized machine.
>>> (Desktop mini router - I can see running just a kyb and E-Stop.)
>>>
>>>
>>> Not sure if Mesa's SSerial card for pendants could do that. There is
>>> definitely money to be made if some enterprising person or company were to
>>> make a plug in adapter harness for Haas and FADAL control consoles.
>>>
>>> Greg Bentzinger out yonder in Colorado
>>>
>>> 
>>> --
>>> 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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>

Peter Wallace
Mesa Electronics

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Re: [Emc-users] Haas thoughts

[andy pugh]

On 11 October 2016 at 23:24, Erik Friesen  wrote:
> omehow these amps have to figure power and
> location for the bldc phase,

Is that the pinout between the motors and the drive? Or is it the
control signal to the drive?

-- 
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] Haas thoughts

[Erik Friesen]

The pinout coming from the brushless amps is

610-1 +A CHANNEL
610-2 ANALOG GROUND
610-3 +B CHANNEL
610-4 ANALOG GROUND
610-5 ENABLE
610-6 LOGIC GROUND
610-7 FAULT
610-8 LOGIC GROUND
610-9 NOT USED
610-10 SHIELD/ANALOG GROUND

Any ideas what signal levels and types those will be?  The encoders feed
through the mocon pcb, so somehow these amps have to figure power and
location for the bldc phase, and I don't see how that is accomplished.

On Tue, Oct 11, 2016 at 3:29 PM, Erik Friesen  wrote:

> My haas is a 1996 and it shows.  Attempting 0.1" engraving at 40ipm G187
> E.001 doesn't work, and I think it is a control limitation.  See two paths
> in this pic?  aercon.net/Public/Engraving.jpg  The top is attempted at 40
> IPM, the bottom at 15.  To me it looks like a trajectory planning
> limitation.
>
> The only person to attempt a haas vf conversion never finished it.
>
> On Tue, Oct 11, 2016 at 3:03 PM, Greg Bentzinger 
> wrote:
>
>> Perspective on anything read on cnccookbook.com
>>
>> Keep in mind that site exists to promote his software and his articles
>> are written by someone who does not have long term (if any) experience with
>> "Big Iron" in an industrial business environment.
>>
>> His opinions are biased towards the hobby/semi-pro market as that is the
>> best he knows. Some info offers keen insights, while others are plain
>> wrong. His software can be helpful if you are willing to make a windows PC
>> with internet connection available to employees on the floor. ( Network
>> connection is required so software can phone home to validate your
>> subscription license.)
>>
>> Personally I use the other (competitor) option which has a Buy once cry
>> once license option and is cross platform so it will run on my Android
>> phone as well as PC.
>>
>> I know there are a very large group who loves the HAAS control, I
>> however, after having to try and keep 8 lathes and 3 mills running and knew
>> my Haas repair crew better than any other vendor, so I'm definitely not one
>> of those fan boys. I like toggle switches and rotary knobs I can see status
>> from 10m or yrds away. Plus tapping a membrane key to increment up or down
>> a feed rate or spindle speed seems just wrong on a full sized machine.
>> (Desktop mini router - I can see running just a kyb and E-Stop.)
>>
>>
>> Not sure if Mesa's SSerial card for pendants could do that. There is
>> definitely money to be made if some enterprising person or company were to
>> make a plug in adapter harness for Haas and FADAL control consoles.
>>
>> Greg Bentzinger out yonder in Colorado
>>
>> 
>> --
>> 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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Re: [Emc-users] Haas thoughts

[Erik Friesen]

My haas is a 1996 and it shows.  Attempting 0.1" engraving at 40ipm G187
E.001 doesn't work, and I think it is a control limitation.  See two paths
in this pic?  aercon.net/Public/Engraving.jpg  The top is attempted at 40
IPM, the bottom at 15.  To me it looks like a trajectory planning
limitation.

The only person to attempt a haas vf conversion never finished it.

On Tue, Oct 11, 2016 at 3:03 PM, Greg Bentzinger 
wrote:

> Perspective on anything read on cnccookbook.com
>
> Keep in mind that site exists to promote his software and his articles are
> written by someone who does not have long term (if any) experience with
> "Big Iron" in an industrial business environment.
>
> His opinions are biased towards the hobby/semi-pro market as that is the
> best he knows. Some info offers keen insights, while others are plain
> wrong. His software can be helpful if you are willing to make a windows PC
> with internet connection available to employees on the floor. ( Network
> connection is required so software can phone home to validate your
> subscription license.)
>
> Personally I use the other (competitor) option which has a Buy once cry
> once license option and is cross platform so it will run on my Android
> phone as well as PC.
>
> I know there are a very large group who loves the HAAS control, I however,
> after having to try and keep 8 lathes and 3 mills running and knew my Haas
> repair crew better than any other vendor, so I'm definitely not one of
> those fan boys. I like toggle switches and rotary knobs I can see status
> from 10m or yrds away. Plus tapping a membrane key to increment up or down
> a feed rate or spindle speed seems just wrong on a full sized machine.
> (Desktop mini router - I can see running just a kyb and E-Stop.)
>
>
> Not sure if Mesa's SSerial card for pendants could do that. There is
> definitely money to be made if some enterprising person or company were to
> make a plug in adapter harness for Haas and FADAL control consoles.
>
> Greg Bentzinger out yonder in Colorado
>
> 
> --
> 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
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> https://lists.sourceforge.net/lists/listinfo/emc-users
>
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Re: [Emc-users] Haas thoughts

[Greg Bentzinger]

Perspective on anything read on cnccookbook.com

Keep in mind that site exists to promote his software and his articles are 
written by someone who does not have long term (if any) experience with "Big 
Iron" in an industrial business environment.

His opinions are biased towards the hobby/semi-pro market as that is the best 
he knows. Some info offers keen insights, while others are plain wrong. His 
software can be helpful if you are willing to make a windows PC with internet 
connection available to employees on the floor. ( Network connection is 
required so software can phone home to validate your subscription license.)

Personally I use the other (competitor) option which has a Buy once cry once 
license option and is cross platform so it will run on my Android phone as well 
as PC.

I know there are a very large group who loves the HAAS control, I however, 
after having to try and keep 8 lathes and 3 mills running and knew my Haas 
repair crew better than any other vendor, so I'm definitely not one of those 
fan boys. I like toggle switches and rotary knobs I can see status from 10m or 
yrds away. Plus tapping a membrane key to increment up or down a feed rate or 
spindle speed seems just wrong on a full sized machine. (Desktop mini router - 
I can see running just a kyb and E-Stop.)


Not sure if Mesa's SSerial card for pendants could do that. There is definitely 
money to be made if some enterprising person or company were to make a plug in 
adapter harness for Haas and FADAL control consoles.

Greg Bentzinger out yonder in Colorado

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Re: [Emc-users] linux cnc servo interface help

[Kirk Wallace]

On 10/11/2016 03:19 AM, linden wrote:
> hello all,
>
>   I need some help and suggestions on interfacing dmm dyn4 servo
> driver with Linuxcnc

http://www.dmm-tech.com/Dyn4_main.html

LinuxCNC has all the features you need for servo control built-in, you 
really just need a dumb motor driver, then let LinuxCNC do the rest 
(encoder feedback, PID, command output). I use Pico's PWM input motor 
amplifiers to run brushed servos. I believe there are equivalent setups 
for brushless motors. This way LinuxCNC and therefore _you_ get full 
oversight and control of the system.


-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/

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Re: [Emc-users] Haas thoughts

[Todd Zuercher]

I would have said it was more incorrect and misleading than out of date.

And the fellows claim of DNC as being a "feature" is laughable.  I work with 
Fanuc controls all day, DNC isn't a "feature" it is a band-aid work-around for 
the controls limited memory, and a huge pain in the ass to have to work around 
to.  Did you know many of Fanuc's custom macros features don't work in DNC or 
that you can't run a sub program unless either it or the main program are 
stored in the machine memory.  The list of Fanuc DNC limitations goes on and 
on.  The only thing more annoying then trying to use the DNC, is trying to 
load/unload programs into the machine memory all the time. 

And tool compensation isn't any easier to use or more or less functional in 
Fanuc than it is in Linuxcnc. As far as I know all the same rules need (or 
should) be followed.

And code compatibility is also a joke. Our shop has 3 different Fanuc control 
models (11m, 21i, and oi-MB) in the shop on 7 machines from 4 different 
manufacturers, and the code for each manufacturer's machines are incompatible 
with all the others.  There are some basic similarities, but for the most part 
the code I run on our Linuxcnc machines is no more different from the code for 
one of our Fanuc controlled machines than our Fanuc controlled machines are 
from each other.  


- Original Message -
From: "Dave Caroline" 
To: "Enhanced Machine Controller (EMC)" 
Sent: Tuesday, October 11, 2016 9:33:11 AM
Subject: Re: [Emc-users] Haas thoughts

That is very out of date, LinuxCNC having branching etc in the gcode
as well as rigid tapping, read the docs for real info not random
websites

Dave Caroline

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Re: [Emc-users] Haas thoughts

[sam sokolik]

If you look at the comments - Seb counters almost all of his points ;)

sam

On 10/11/2016 8:33 AM, Dave Caroline wrote:
> That is very out of date, LinuxCNC having branching etc in the gcode
> as well as rigid tapping, read the docs for real info not random
> websites
>
> Dave Caroline
>
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>


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Re: [Emc-users] Haas thoughts

[Dave Caroline]

That is very out of date, LinuxCNC having branching etc in the gcode
as well as rigid tapping, read the docs for real info not random
websites

Dave Caroline

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[Emc-users] Haas thoughts

[Erik Friesen]

Are any of these items valid any more?

http://blog.cnccookbook.com/2014/12/16/10-features-pros-hobby-cnc-controllers-dont/

What would it take (software wise) to fully integrate a haas keypad so that
most of the functions would be usable?  The ones I see as a challenge are
items like Posit, Offset, and all the edit functions.

Reference keypad http://aercon.net/Public/HaasKeyboard.jpg
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Re: [Emc-users] linux cnc servo interface help

[andy pugh]

On 11 October 2016 at 11:19, linden  wrote:

> current plan for linear axis
>
> - Run the servo in position mode
>
> - Feed the servo  drive a step and direction signal from linuxcnc let
> the drive do its magic with its own pid loop.

The DYN4 can run in analogue-controlled velocity mode. That might be
worth considering.
It probably doesn't work any better than running the loop in the
drive, but it is easier to see what the loop is doing.

(Actually, it might also work better, as there is the possibility of
using velocity feed-forward)

-- 
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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[Emc-users] linux cnc servo interface help

[linden]

hello all,

 I need some help and suggestions on interfacing dmm dyn4 servo 
driver with Linuxcnc
At the moment I have 4 liner axis bellow is a rough outline of what i 
have in mind. My 2 questions are:

  Dose this make sense or is there a better way to do this? (am I 
completely out to lunch)

  What hardware should i use to bring these signals in and out of linux 
cnc bearing in mind i will need IO for limit switches cycle start and 
feed over rides ect. I was leaning toward a mesa 7i92 because of its 
network interface allowing me to keep all my io wiring short and clean 
just leaving me one network cable to control computer. but not sure what 
to use for daughter cards but am open to other suggestions.


current plan for linear axis

- Run the servo in position mode

- Feed the servo  drive a step and direction signal from linuxcnc let 
the drive do its magic with its own pid loop.

- Take the encoder signal from the servo drive for linxcnc to use in 
displaying position in the gui ect.

- Take the position error signal from the drive and feed this back to 
linuxcnc for warning error ect

servo spec for step pulse
5vdc +-10%
max pulse freq 500khz
min plse with 0.8us

servo spec encoder signal output
5vdc standard line drive output with +A -A +B -B Z
z pulse 0.7us

servo spec position error
analog out put of 0 to 3.3 vdc with zero error at 1.65vdc

I can supply the spec sheets and manuals from dmm if more info is needed
thanks in advance for any help or thoughts you can provide.

linden


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Re: [Emc-users] Happy 82nd to me, and the latest version of my G76 tweaker for you

[Gene Heskett]

On Tuesday 11 October 2016 03:49:03 Erik Christiansen wrote:

> On 10.10.16 09:58, Gene Heskett wrote:
> > Where are you that the weather took such a serious swipe at you?
>
> In the Dandenong ranges, at an altitude of 600', on the outskirts of
> Melbourne, Victoria. (38°S)

So you are almost exactly as far south as I am north.

> The 120 km/h winds are not so common here; 
> the last time I experienced them was 27 years ago, when a falling 4'
> diameter tree hit a 40' Blackwwood halfway up, hurling the top half
> 60' through the air to land on my house slab, going through where the
> balcony and gable end now stand. But there does seem to be a bit more
> energy in the atmosphere now than before - several high wind days
> during the ten just spent out on the farm (~250 km eastward) rattled
> the house as it's rarely been buffeted in 52 years - but consistently
> hard for days longer.

More manifestation of global warming I suspect. :(

> I think there must have been a bit of dryrot in the big Redgums which
> snapped off here. Even a couple of gusts timed to resonance with the
> tree's whippiness oughtn't be able to snap a 1m diameter - even though
> a lot of length each side of the snap, plus a big crown, makes for
> tens of tons flailing back and forth 10m or more at the top.

In 2010, we had a big blow called a direcho come thru here, peak winds 
recorded a block down the street at 120 mph. Took all the big pines 
down, snapping off 40 yo 40 footers about 8 feet up in the air, or 
uprooting them. Took just 4 or 5 minutes according to the wife, who 
instead of hitting the basement to ride it out, stood in the front door 
watching the only tree that withstood it whipping back and forth about 
40 feet at its 50 foot top.  This was a pin oak. Some upwind lower 
branches hung up in a picket fence about 10 feet upwind were damaged but 
has since recovered. At the time that 50 footer was perhaps 20" thick 3 
feet up, pushing 30" now. I was, at the time, listening to a pounding 
rain on the roof of a Lowes indoor lumber yard store about 17 miles east 
in Buchanon WV, so loud that talking to a clerk 2 feet away had us both 
yelling. I boogied past the register and headed home as soon as it 
showed signs of letting up. A mess as I was at times driving upwind of 
that blows path, with downed trees being the major landscape 
decorations. No major structural damage to the house but lost 4 big 
pines, part of the shingles, some siding & guttering on the back, and 
nearly all the board fencing.  So I had much of the rest of the summer 
rebuilding all that.

I was instructed, in the middle of the cleanup activities, to build a 
circular bench around that tree so folks could sit in its shade, and a 
fridge strapped to the tree was supposed to be stocked with an 
assortment of beers & cold tea's.  Never happened of course as I wanted 
a cover charge. ;D  Just neighborly ribbing, this is and has been the 
soon to be 27 years I've been here, a good, everybody knows everybody 
neighborhood. Since the place is paid off for about 15 years now, I'll 
ride it out till the rapture.

Thanks Erik.

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] Happy 82nd to me, and the latest version of my G76 tweaker for you

[Erik Christiansen]

On 10.10.16 09:58, Gene Heskett wrote:
> 
> Where are you that the weather took such a serious swipe at you?

In the Dandenong ranges, at an altitude of 600', on the outskirts of
Melbourne, Victoria. (38°S) The 120 km/h winds are not so common here;
the last time I experienced them was 27 years ago, when a falling 4'
diameter tree hit a 40' Blackwwood halfway up, hurling the top half 60'
through the air to land on my house slab, going through where the
balcony and gable end now stand. But there does seem to be a bit more
energy in the atmosphere now than before - several high wind days during
the ten just spent out on the farm (~250 km eastward) rattled the house
as it's rarely been buffeted in 52 years - but consistently hard for
days longer.

I think there must have been a bit of dryrot in the big Redgums which
snapped off here. Even a couple of gusts timed to resonance with the
tree's whippiness oughtn't be able to snap a 1m diameter - even though a
lot of length each side of the snap, plus a big crown, makes for tens of
tons flailing back and forth 10m or more at the top.

Erik

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