Re: [Emc-users] Wiring Step Dir on KM5056E

[johnd]

It's a good idea to create a drawing like the one in this link.  It shows how 
to connect a Breakout Board to the 
system.https://www.automationtechnologiesinc.com/products-page/featured-cnc-products/kl-5056e-digital-stepper-driverThe
 stepper drivers tend to have opto inputs and can be wired to open collector or 
pnp sourcing transistors.JohnSent from my Samsung S10
 Original message From: Alan Condit via Emc-users 
 Date: 2023-07-03  11:28 a.m.  (GMT-08:00) To: 
EMC-Users  Cc: Alan Condit 
 Subject: [Emc-users] Wiring Step Dir on KM5056E I am 
in the process of wiring up a new controller for RPi4 using 7c81 and 7i76. In 
the process of doing so, I discovered that I had wired my controller for my 
PCBMill with a 7i76E Step+ to KM5056E Pulse-, Step- to KM5056E Pulse+, Dir+ to 
KM5056E Dir-, and Dir- to KM5056 Dir+.It seems to run fine but, if I correct 
the connections Step+ to Pulse+, Step- to Pulse-, Dir+ to Dir+ and Dir- to Dir- 
what will happen. I don’t really want to break something that works.Thanks in 
Advance,Alan___Emc-users mailing 
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Re: [Emc-users] An actual application for non-circular boring..

[johnd]

Amazing!Sent from my Samsung S10
 Original message From: Sam Sokolik  Date: 
2023-04-20  10:25 a.m.  (GMT-08:00) To: "Enhanced Machine Controller (EMC)" 
 Subject: Re: [Emc-users] An actual 
application for non-circular boring.. the corners are what the boring 
produced.samOn Thu, Apr 20, 2023 at 12:18 PM John Dammeyer 
wrote:> Nice square edges on the flat.> 
https://photos.app.goo.gl/isaJ3CqR1kLjqoPK6>> Or did you use the shaper 
approach and cut the corners that way?> John>> > -Original Message-> > 
From: Sam Sokolik [mailto:samco...@gmail.com]> > Sent: April-20-23 9:28 AM> > 
To: Enhanced Machine Controller (EMC)> > Subject: Re: [Emc-users] An actual 
application for non-circular boring..> >> > I did it on the mill..> >> > (this 
was testing)> > https://www.youtube.com/shorts/23bEsKMNJH0> >> > On Thu, Apr 
20, 2023 at 11:08?AM John Dammeyer > > wrote:> >> > > 
So it was bored on the lathe using your spindle tracked motion?> > >> > > > 
-Original Message-> > > > From: Sam Sokolik 
[mailto:samco...@gmail.com]> > > > Sent: April-20-23 5:03 AM> > > > To: 
Enhanced Machine Controller (EMC)> > > > Subject: Re: [Emc-users] An actual 
application for non-circular> boring..> > > >> > > > Sure - Maybe if it was 
made out of steel - the area is so tight that> > > there> > > > isn't much room 
around the ball nut.> > > >> > > > The green machine that I am using to cut 
this has just what you say.> > > > (obviously a lot more room)> > > >> > > > 
https://electronicsam.com/images/greenmachine/20180903_154610.jpg> > > >> > > > 
But what fun would that be?  ;)> > > >> > > > This is a nice press fit.  it 
turned out better than I thought it> would.> > > > Now I just can't screw up 
the rest of the machining...  :)> > > >> > > > sam> > > >> > > > On Thu, Apr 
20, 2023 at 2:58?AM andy pugh > wrote:> > > >> > > > > On 
Thu, 20 Apr 2023 at 02:21, Sam Sokolik > wrote:> > > > >> > 
> > > >> > > > > > https://photos.app.goo.gl/uqdkdMuDpp8oACy3A> > > > >> > > > 
>> > > > > That's really nice, though I think it might have worked just as> 
well> > > with> > > > > the bottom open and a circular bore?> > > > >> > > > > 
--> > > > > 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, 1912> > > > >> > > > > 
___> > > > > Emc-users mailing 
list> > > > > Emc-users@lists.sourceforge.net> > > > > 
https://lists.sourceforge.net/lists/listinfo/emc-users> > > > >> > > >> > > > 
___> > > > Emc-users mailing list> 
> > > Emc-users@lists.sourceforge.net> > > > 
https://lists.sourceforge.net/lists/listinfo/emc-users> > >> > >> > >> > > 
___> > > Emc-users mailing list> > 
> Emc-users@lists.sourceforge.net> > > 
https://lists.sourceforge.net/lists/listinfo/emc-users> > >> >> > 
___> > Emc-users mailing list> > 
Emc-users@lists.sourceforge.net> > 
https://lists.sourceforge.net/lists/listinfo/emc-users 
___> Emc-users mailing list> 
Emc-users@lists.sourceforge.net> 
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Re: [Emc-users] Pi4 SSD, MicroSD use

[johnd]

Hi Thaddeus,Can you add some information? 1. What USB 3.0 to SATA adapter are 
you using?2. Or is it a case that the SATA drive or SSD fits into?3. Which 
specific SSD are you using?  Thanks JohnSent from my Samsung S10
 Original message From: Thaddeus Waldner  
Date: 2022-06-30  7:47 a.m.  (GMT-08:00) To: "Enhanced Machine Controller 
(EMC)"  Subject: [Emc-users] Pi4 SSD, MicroSD 
use Here are some recent experiences with flash storage on a Pi4 as 
adevelopment environment running LinuxCNC 2.8.2.A while back I posted in this 
mailing list that using an SSD on the Pi4 isprohibitive because it causes 
latency issues. At the time, I tested this ona heavily used, repurposed ssd. I 
later discovered that the SSD was failingdue to write wear. This is likely what 
caused the latency issues in thefirst place.In the meantime I ran the Pi4 (2GB 
memory) as  a development platform,running up to 3 instances of VS Code (1.5GB 
memory each) along with Glade,browser, etc. This type of usage made short work 
of the Samsung EVO microSDcard. The card wear issue first showed up as spurious 
latency violations. Abit later the entire system became maddeningly slow and 
unusable.Cloning to a fresh sd card solved the problem.In the process of making 
backups I also cloned the system to an SSD (intel320 this time) and to my 
surprise, it ran with zero latency issues. I willbe using SSDs from now on, 
thank you.Some takeaways:1) large page files are bad news for cheap flash 
storage2) "worn out" storage will cause latency issue on low latency systems3) 
latency tests on a low latency system might be a way to detect flashwrite wear 
issues.Thaddeus___Emc-users mailing 
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Re: [Emc-users] Homebuilt encoder

[johnd]

Nicely done!Sent from my Samsung S10
 Original message From: Lawrence Glaister  Date: 
2022-03-31  11:30 a.m.  (GMT-08:00) To: emc-users@lists.sourceforge.net 
Subject: Re: [Emc-users] Homebuilt encoder Hi Andrew,It has been a few years 
since I added a spindle encoder to my lathe. I have a web page describing the 
gruesome details that might give you some ideas and some gcode to play with for 
cutting the disks. This encoder is still in operation with the data being fed 
into a parallel port on an older PIII 700Mhz Del box running ubuntu 
10.4.https://ve7it.cowlug.org/spindle-encoder.htmlcheersLawrence VE7ITOn 
2022-03-31 10:10, Chris Albertson wrote:> On Wed, Mar 30, 2022 at 11:18 PM 
andrew beck > wrote:> >> Hey guys will this work 
OK? I think it's the same as the one from amazon 
https://www.trademe.co.nz/3531064367>> And I'm thinking I may need two 
discs.  One above the other so I can use a>> index sensor on the top layer.   
Or maybe stick a proxy sensor on it. Looks like they have a 6mm gap between 
the slots in the sensor.   Do you>> think a 1mm wide gap gap would be ok maybe 
in a 2 mm thick sheet?> > > > The link does not work for me.> > Ideally the 
slots and the space between the slots is the same.   But this> only really 
matters if> 1) you intend to double the resolution by looking at leading and 
trailing> edges.> 2) and when the spindle reverses direction there is a small 
error if the> geometry is asymmetric.  Maybe the error is too small to break a 
tap, I> don't know.> > If the plate is thinck relative to the slot width all 
that means is the> alignment most be good, with the IR beam exactly 90 degrees 
to the disk.> The Omron senors, when you look inside use a very thin disk, like 
brass> shim stock. This minimizes any error caused by misalignment.   The very> 
high-end sensor use glass disks with vapor deposited aluminum to block the> 
light.> > Don't bother with two disks, because alignment can never be 100% 
perfect.>   Simply drill a hole for the index or make one slot deeper.> > A 
trick used in automotive sensors is to have one missing slot.  Then> software 
resets the counter when the expected pulse does not happen  This> saves the 
cost of the third sensor but that only matters if you build a> million cars.  
IR sensors cost only about $1.>  On Mon, 28 Mar 2022, 07:35 Chris 
Albertson, >> wrote:> Forgot to include a link.  
You can buy the bare sensor but also you can>> buy>>> them on PCBs with 
connectors attached and ready to go.>>> 
amazon.com/Measuring-Optocoupler-Interrupter>>> <> 
https://www.amazon.com/Measuring-Optocoupler-Interrupter-Detection-Arduino%EF%BC%885pcs%EF%BC%89/dp/B08977QFK5/ref=sr_1_17?keywords=c+optical+sensor=1648405019=8-17>>
 Best to use a thin aluminum plate to make the interrupter disk.   Make>> 
the>>> slots 50% duty cycle,    You need three sensors for quadrature with>> 
index.>>>   The above sensor should directly interface to Measa or a parallel 
port>> or>>> some microcontroler.> On Sun, Mar 27, 2022 at 10:02 AM 
Chris Albertson <>>> albertson.ch...@gmail.com wrote:>>> THis goes to 
10K RPM?   that is 167 revolutions per second.  400 slots means 70 KHz 
signal. Can you design an inductive sensor that does 70KHz but is 
also>> sensitive enough for near zero RPM?   Optical sensors can work up to 
1MHz with no problem as they don't have any inductanve.    You can buy a 
"C" space sensor for a few dollars In either case, optical of 
inductive, you want a 50% "slot" where there>>> is as much metal left as 
cut away  Then the "edges" of the square wave are>>> the same in either 
direction. The 50% duty cycle in effect doubles the sensor 
resolution. Why?  Think about the signal when the direction changes.
 You have>> two sensors in quadrature and lets say one is being blocked and 
one is not,>>> I think you want the turnaround to take as long for each 
sensor. On Sun, Mar 27, 2022 at 2:22 AM Andy Pugh 
 wrote: On 27 Mar 2022, at 08:09, 
andrew beck >>> wrote: And is bigger dia 
better for higher resolution?>> Probably not, as it will perhaps have 
more scope to oscillate at>> 10,000> rpm.>> Don’t neglect the 
purely mechanical design of this fast-spinning part.>> Have you 
considered optical sensors rather than inductive?>> What will be 
counting the pulses?>> LinuxCNC can lathe-thread with one sensor.> 
But rigid-tapping is different as it needs to accurately detect the> 
reversal point. So you need three channels for index and full>>> 
quadrature.>> Work out what error you can accept in the reversal point 
detection>> (as a> fraction of thread pitch) and you can get a feel for how 
many slots>> you> need.> 
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Re: [Emc-users] need gcode maker

[johnd]

Darn spell check. UV as in ultra violetSent from my Samsung S10
 Original message From: johnd  Date: 
2022-02-14  10:33 a.m.  (GMT-08:00) To: "Enhanced Machine Controller (EMC)" 
 Subject: Re: [Emc-users] need gcode maker 
What about us protection with WEST system?Sent from my Samsung S10 
Original message From: dave engvall  Date: 
2022-02-14  8:05 a.m.  (GMT-08:00) To: emc-users@lists.sourceforge.net Subject: 
Re: [Emc-users] need gcode maker I typically have gone to West Marine for 
epoxy. 5:1 mix ratio with metered pumps. Good  idea about avoiding the glass 
expander/thickener micro bubbles. :-) Fast, med and slow catalyst 
available.DaveOn 2/14/22 2:10 AM, Gregg Eshelman via Emc-users wrote:> Modern 
epoxies like the ones sold by Total Boat set up harder and don't yellow like 
the epoxies of the 1980's and earlier. An alternative to epoxies are the hard 
urethane resins, also typically made with UV protection.>> Total Boat looks 
like it's the #1 brand of epoxy used by people making those "river" tables and 
mixing all kinds of weird stuff with epoxy to turn fancy bowls on wood 
lathes.>>> On Sunday, February 13, 2022, 06:16:31 PM MST, Chris Albertson 
 wrote:>> It is not the epoxy that is so hard.  It 
is the filler they mix with the> epoxy.  Many times it is a kind of glass, not 
unlike what they use to make> sand paper.  Other times they mix finely ground 
bits of steel.>> I used to use a brand of epoxy that sold bottles of pure resin 
and cans of> filler.  I could mix what I needed for the job.  Sometimes I'd use 
"micro> balloon" filler these are tiny hollow balls of glass.  A gallon tub of 
them> weights about as much as an empty tub.  Mixed to a thick paste, it cures 
to> a foam you can and with a sure-form rasp.  But if you mix the same resin> 
with chopped fiberglass or chopped kevlar fiber it is as hard as stone and> 
you'd need an angle grinder to smooth it down.  I was building small boats> and 
canoes.>> Yes epoxy can be damaged by UV light.  If doing a gunstock, put 4 or 
5> coats of exterior marine varnish over it.  The marine stuff has UV blockers> 
(sunscreen) in it.>>> ___> 
Emc-users mailing list> Emc-users@lists.sourceforge.net> 
https://lists.sourceforge.net/lists/listinfo/emc-users___Emc-users
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Re: [Emc-users] need gcode maker

[johnd]

What about us protection with WEST system?Sent from my Samsung S10
 Original message From: dave engvall  
Date: 2022-02-14  8:05 a.m.  (GMT-08:00) To: emc-users@lists.sourceforge.net 
Subject: Re: [Emc-users] need gcode maker I typically have gone to West Marine 
for epoxy. 5:1 mix ratio with metered pumps. Good  idea about avoiding the 
glass expander/thickener micro bubbles. :-) Fast, med and slow catalyst 
available.DaveOn 2/14/22 2:10 AM, Gregg Eshelman via Emc-users wrote:> Modern 
epoxies like the ones sold by Total Boat set up harder and don't yellow like 
the epoxies of the 1980's and earlier. An alternative to epoxies are the hard 
urethane resins, also typically made with UV protection.>> Total Boat looks 
like it's the #1 brand of epoxy used by people making those "river" tables and 
mixing all kinds of weird stuff with epoxy to turn fancy bowls on wood 
lathes.>>> On Sunday, February 13, 2022, 06:16:31 PM MST, Chris Albertson 
 wrote:>> It is not the epoxy that is so hard.  It 
is the filler they mix with the> epoxy.  Many times it is a kind of glass, not 
unlike what they use to make> sand paper.  Other times they mix finely ground 
bits of steel.>> I used to use a brand of epoxy that sold bottles of pure resin 
and cans of> filler.  I could mix what I needed for the job.  Sometimes I'd use 
"micro> balloon" filler these are tiny hollow balls of glass.  A gallon tub of 
them> weights about as much as an empty tub.  Mixed to a thick paste, it cures 
to> a foam you can and with a sure-form rasp.  But if you mix the same resin> 
with chopped fiberglass or chopped kevlar fiber it is as hard as stone and> 
you'd need an angle grinder to smooth it down.  I was building small boats> and 
canoes.>> Yes epoxy can be damaged by UV light.  If doing a gunstock, put 4 or 
5> coats of exterior marine varnish over it.  The marine stuff has UV blockers> 
(sunscreen) in it.>>> ___> 
Emc-users mailing list> Emc-users@lists.sourceforge.net> 
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Re: [Emc-users] Tap size

[johnd]

Hi Gene. Would you measure and post the results please.I bought a very 
expensive spiral tap that I expected would meet ISO or DIN standards.  
Not!Another I have also doesn't. So I'm curious. Thanks JohnSent from my 
Samsung S10
 Original message From: Gene Heskett  
Date: 2021-12-09  1:09 p.m.  (GMT-08:00) To: emc-users@lists.sourceforge.net 
Subject: Re: [Emc-users] Tap size On Thu, 9 Dec, 2021 at 3:58 PM, johnd 
 wrote: To: enhanced machine controller (emc)Mini 
surveyIf you have an M6 x1.0 tap in your tool box what is the shank and flat 
dimension?Sent from my Samsung S10It will vary John, I have at least 3 of them, 
and no two are the same size.Get one and measure it is my poor attempt at being 
helpful...Take care and stay wellCheers, 
Gene___Emc-users mailing 
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[Emc-users] Tap size

[johnd]

Mini surveyIf you have an M6 x1.0 tap in your tool box what is the shank and 
flat dimension?Sent from my Samsung S10
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Re: [Emc-users] Harmonic Drive

[johnd]

How odd.  All I got on that step file link was 404 not found. Sent from my 
Samsung S10
 Original message From: Chris Albertson 
 Date: 2021-12-01  1:22 p.m.  (GMT-08:00) To: 
"Enhanced Machine Controller (EMC)"  Subject: 
Re: [Emc-users] Harmonic Drive Thanks for the link.  But I noticed there was a 
STEP file provided.   I'veimported it into Fusion360.  It imports well.  No 
need to convert the STLfiles.Here is a view-only public link to the Fusion360 
model.https://a360.co/3phrfI6I've made no edits to the above. simply did the 
import.The model could use some reorganization.  It is just a linear list of 
partswith no hierarchy but unlike STL files the exact shape of the parts 
ispreserved.Thanks again.ChrisOn Wed, Dec 1, 2021 at 9:33 AM John Dammeyer 
 wrote:> Chris,>> This was my starting point.  The step 
files aren't available in that> link.  The STLs have been converted although 
some badly.  Still working on> getting better step files from STL.>>> 
https://howtomechatronics.com/how-it-works/what-is-strain-wave-gear-harmonic-drive-a-perfect-gear-set-for-robotics-applications/>>
 I don't have the larger 47x35 bearings yet so I subbed in a 47x20.> Without 
two bearings there will always be a bit of wiggle there.  I found> only two of 
the 5x16x5 in my random bearing box.  I have 10 of those on> order too.  For 
now I recreated the wave generator to just use two> bearings.>> I have a tube 
of 11mm bearings that when doubled up (or maybe not) can be> put closer 
together creating less of a point source bend that the single> bearing does.  
That might fatigue the plastic less.>> Also turning the hub that goes through 
the bearing out of metal and making> the companion mounting plate for the cup 
out of metal would allow a coupler> shaft through from the wave generator disk 
to the centerline of the drive> bearing.  This would likely also clean up any 
wobble from thin printed> plastic.>> John > -Original Message-> > 
From: Chris Albertson [mailto:albertson.ch...@gmail.com]> > Sent: 
December-01-21 9:13 AM> > To: Enhanced Machine Controller (EMC)> > Subject: Re: 
[Emc-users] Harmonic Drive> >> > John,> >> > Looks like I'm finding this thread 
late.  Where are the design files for> > this harmonic drive?> >> > On Tue, Nov 
30, 2021 at 11:22 PM John Dammeyer > > wrote:> >> > > 
I've added a photo.> > > 
www.autoartisans.com/harmonicdrive/HarmonicDrive-8.jpg> > >> > > The new wave 
generator pieces puts the bearings 1mm further out.  Was> also> > > able to 
bring it a bit closer to the motor so the bearings now sit in> the> > > middle 
of the fixed spline gear.> > >> > --> >> > Chris Albertson> > Redondo Beach, 
California> >> > ___> > Emc-users 
mailing list> > Emc-users@lists.sourceforge.net> > 
https://lists.sourceforge.net/lists/listinfo/emc-users 
___> Emc-users mailing list> 
Emc-users@lists.sourceforge.net> 
https://lists.sourceforge.net/lists/listinfo/emc-users>-- Chris 
AlbertsonRedondo Beach, 
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Re: [Emc-users] USB to Ethernet

[johnd]

I was under the impression that the Mesa required dedicated Ethernet so UDP 
packets wouldn't be delayed. JohnSent from my Samsung S10
 Original message From: Chris Albertson 
 Date: 2021-11-16  9:51 a.m.  (GMT-08:00) To: 
"Enhanced Machine Controller (EMC)"  Subject: 
Re: [Emc-users] USB to Ethernet Do you mean that the notebook PC has Ethernet, 
but it is in use, and youwant to add a second Ethernet port? That is not 
the way to go.  Buy anEthernet Switch.  Or perhaps your notebook is already 
connected to aswitch, then just plug the Mesa card into the switch.   Not only 
is this acheaper solution it is more efficient of resource in the PC and Mesa 
can'tknow the difference.> And the one Ethernet port on the machine is 
connected to the MESA board.> I don't have reliable WiFi so a USB to Ethernet 
would be one way to get> into it.  Although working with the probe I'd rather 
be right there with my> hand on the ESTOP.>> John> 
___> Emc-users mailing list> 
Emc-users@lists.sourceforge.net> 
https://lists.sourceforge.net/lists/listinfo/emc-users>-- Chris 
AlbertsonRedondo Beach, 
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Re: [Emc-users] Safely Upgrading LinuxCNC

[johnd]

On which list?  The one where I added 2.8? Sent from my Samsung S10
 Original message From: Andy Pugh  Date: 
2021-09-15  11:01 a.m.  (GMT-08:00) To: "Enhanced Machine Controller (EMC)" 
 Subject: Re: [Emc-users] Safely Upgrading 
LinuxCNC > On 15 Sep 2021, at 19:10, John Dammeyer  
wrote:> > Kind of odd behaviour now that 2.8 is in the list.  I can no longer 
select it for installation.It looks like you have several other LinuxCNC 
sources in the list. Delete those and then refresh. (Ie only keep the 2.8 
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Re: [Emc-users] Something went wrong.

[johnd]

I'm traveling for work today so can't dig deeper until tonight or tomorrow. 
Thanks for the suggestions. Sent from my Samsung S10
 Original message From: marcus.bow...@visible.eclipse.co.uk 
Date: 2021-08-04  12:04 p.m.  (GMT-08:00) To: "Enhanced Machine Controller 
(EMC)"  Subject: Re: [Emc-users] Something 
went wrong. John,Two suggestions:1. I have experienced the same symptoms in the 
past, and it turned out to be the bolts securing my Y axis nut (which has a 
square flanged base) moving under the inertial load of the table.2. My approach 
to machining the part might be to not cut the box section to an L 
section.Square off the end of the box section.Mount a hard endstop on the side 
of the vice (or clamp something on the table) to act as a left endstop and 
reference.Put the box section in the vice.Machine the top face (for example: 
the face with the two elongated holes), but leave maybe 4 tabs to hold it in 
position. Don't do this right at the end of the box.Remove the box, rotate 90 
degrees, and grip again, against the endstop and with the 
other_face_to_be_machined uppermost.Machine that other face (the one with the 
circular cut-out), perhaps leaving a couple of tabs to hold it in place and 
make sure the box doesn't try to collapse inwards.Remove the box and manually 
cut the tabs.Marcus___Emc-users 
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Re: [Emc-users] Probe Basic UI

[johnd]

Installing g it appears to want Prempt RT. I'm on doggy walk at the moment. Is 
that what is on the Pi4 LCNC?Sent from my Samsung S10
 Original message From: andy pugh  Date: 
2021-07-19  10:32 a.m.  (GMT-08:00) To: "Enhanced Machine Controller (EMC)" 
 Subject: Re: [Emc-users] Probe Basic UI On 
Mon, 19 Jul 2021 at 18:15, John Dammeyer  wrote:>> 
Anyone have any comments on this UI> 
https://kcjengr.github.io/probe_basic/quick_start.htmlIt seems very popular on 
the forum.-- atp"A motorcycle is a bicycle with a pandemonium attachment and 
isdesigned for the especial use of mechanical geniuses, daredevils 
andlunatics."— George Fitch, Atlanta Constitution Newspaper, 
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Re: [Emc-users] G28 behaviour

[johnd]

Ah. Ok.  I'll try that to see what happens on my system. Sent from my Samsung 
S10
 Original message From: Feral Engineer 
 Date: 2021-06-25  10:36 a.m.  (GMT-08:00) To: 
"Enhanced Machine Controller (EMC)"  Subject: 
Re: [Emc-users] G28 behaviour So generally speaking, there are a few 
differences between g28 and g53. Onfanuc and mits controls, g53 is merely 
machine coordinate position, you canput g53 anywhere in the stroke of axis 
travel. G28 is reference returnposition 1, g30 is reference return 2, g30 p3 is 
position 3, g30 p4position 4. G30 positions are all programmable, via 
parameters, for whereto go. The major difference is g28 and g30 both indicate 
back to themachine that it has reached a "home" position, where g53 does not. 
If i sayg53 z0, the machine will not tool change, g91 g28 z0 will enable 
thereference status indicator and allow the tool change, even though it's 
theexact same spot.Phil T.The Feral EngineerCheck out my LinuxCNC tutorials, 
machine builds and other antics atwww.youtube.com/c/theferalengineerHelp 
support my channel efforts and coffee 
addiction:www.patreon.com/theferalengineerOn Fri, Jun 25, 2021, 1:09 PM John 
Dammeyer  wrote:> Thanks for the explanation but I'm 
still curious why the intermediate> point.>> I suppose if I had a tool changer 
at the machine 0,0,0 position (or close> to that) and my A axis sitting on the 
left of the work I'd want to move to> a position that allows a clear path 
directly to the tool changer.>> But, why a special code for this?  If I need Z 
to be at a specific machine> position doesn't a> G53 G0 Z10> G53 G0 Z0>  do the 
same thing?  Granted two lines but one doesn't have to look up> what a G28 
does...>> > -Original Message-> > From: Feral Engineer 
[mailto:theferalengin...@gmail.com]> > Sent: June-25-21 9:51 AM> > To: Enhanced 
Machine Controller (EMC)> > Subject: Re: [Emc-users] G28 behaviour> >> > G28 is 
a return to reference using an intermediate point> >> > G90 G28 z0 would bring 
the tool to absolute Z0 before returning to> > reference zero (machine zero in 
most cases). By using g91 g28 z0, you> > specify that the intermediate point is 
your current position and the> > machine will reference return from there. You 
can also use values such as> > g90 g28 z50. To use 50mm above your workpiece 
origin to be your> > intermediate point or you can use g91 g28 z10. To move 
10mm up and use> that> > as your intermediate.> >> > Fanuc g code system a does 
not use g91, it uses u v w as their respective> > incremental axes for x y and 
z, which is why on a lathe you'll usually> see> > g28 u0 w0 or something of 
that nature. You could use absolute values, but> > they come from your 
workpiece origin, so you'd have to say something like> > g28 x100 z100 to move 
to the absolute intermediate position above the> part> > to not have a crash.> 
>> > The posted code in fusion is just ugly, no real reason to keep flopping> > 
back and forth like that. Fusion posts are JavaScript, so they're not> > 
terrible to modify.> >> > Phil T.> > The Feral Engineer> >> > Check out my 
LinuxCNC tutorials, machine builds and other antics at> > 
www.youtube.com/c/theferalengineer> >> > Help support my channel efforts and 
coffee addiction:> > www.patreon.com/theferalengineer> >> > On Fri, Jun 25, 
2021, 12:28 PM John Dammeyer > wrote:> >> > > A friend 
who uses MACH3 and Fusion360 (free version) found that every> > > G-Code file 
created by Fusion for the MACH environment added:> > >> > > G28 G91 Z0> > > 
G90> > > G28 G91 X0 Y0> > > G90> > >> > > He's since figured out how to tell 
Fusion not to do this but looking> at:> > > 
http://linuxcnc.org/docs/html/gcode/g-code.html#gcode:g28-g28.1> > >> > > I�m 
curious why there are two moves involved in this G-Code.  In this> case> > > 
the G91 changes to relative so the Z0 moves exactly 0 first and then> to the> > 
> machine coordinates Z0 position.  Same with XY.> > >> > > If 5161-5166 have 
something other than 0 and the G91 is left out the> > > system makes some 
interesting moves.> > >> > > My question is why would anyone want this kind of 
behavior?  Where> would a> > > G28 be used without the G91?> > >> > > Is it 
perhaps to move around an obstacle before it heads for 0,0,0?> > >> > > Thanks> 
> > John> > >> > >> > >> > > "ELS! Nothing else works as well for your Lathe"> 
> > Automation Artisans Inc.> > > www dot autoartisans dot com> > >> > >> > > 
___> > > Emc-users mailing list> > 
> Emc-users@lists.sourceforge.net> > > 
https://lists.sourceforge.net/lists/listinfo/emc-users> > >> >> > 
___> > Emc-users mailing list> > 
Emc-users@lists.sourceforge.net> > 
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Re: [Emc-users] Machining question

[johnd]

Mine is a used BEI encoder I was given more than 10 years ago. Digikey lists 
them at $800. For the sake of this Pi4 spindle testing I could just use the 
servo Amp encoder outputs scaled down by the drive. Would be easier. Sent from 
my Samsung S10
 Original message From: Chris Albertson 
 Date: 2021-06-18  9:48 a.m.  (GMT-08:00) To: 
"Enhanced Machine Controller (EMC)"  Subject: 
Re: [Emc-users] Machining question By total coincidence, I am doing the exact 
same thing.  I just bought a 600line optical encoder and now I'm attaching it 
directly to a motor.  Thepurpose is to write and debug some control software.   
  In this case, IREALLY DO WANT to run at the encoder's maximum rated speed of 
5000 RPM, orelse what is the point of the test?BTW, this control software will 
run on the new Raspberry Pi "Pico" that isselling for $4 per unit.  It is a 
surprisingly powerful computer at a pricepoint close enough to "free" that it 
does not matter.   (Few people wouldcare much between paying $0 or paying $4.)  
I think this "Pico" should beable to run four motors and four encoders all at 
5000 RPM.  We shall see.On Fri, Jun 18, 2021 at 9:21 AM Stuart Stevenson 
 wrote:> Sounds like a good plan. Hopefully the testing 
won't involve high rpms so> the od not being perfectly concentric will not 
matter. The motor bearings> will handle it but maybe the encoder bearings won't 
be as robust.>> On Fri, Jun 18, 2021, 10:52 AM John Dammeyer 
> wrote:>> > This isn't as much a LinuxCNC question but 
more of an approach to how to> > machine something.> >> > The attached photo 
shows a coupler from a 3/8" encoder to 14mm Servo> Motor> > so I can test on 
the bench the Pi4 closed loop encoder behavior.> >> > This one didn't turn out 
very well.  I drilled all the way through and> > then used a reamer to bring it 
to 3/8".  It's a firm sliding fit on the> > encoder shaft.  Without removing it 
from the chuck I then drilled halfway> > to 13mm and then used a 14mm reamer to 
bring it to size, testing with the> > motor shaft.> >> > Problem was the reamer 
was slightly tapered at the front so it did a poor> > job.  I finished it up 
with the boring tool but maybe a few thou too> > large.  However the wobble 
seems much worse than that.> >> > I'm thinking the better approach would be to 
drill all the way through> > undersize 3/8" and then drill half way with 13mm.  
Then only use the> boring> > tool to bring the back half up to 3/8" and the 
front up to 14mm.  This> way> > if the initial hole wasn't concentric with 
rotation the boring tool would> > ensure it is.> >> > Make sense?  Or is there 
a better way?> >> > Thanks> > John> >> > 
___> > Emc-users mailing list> > 
Emc-users@lists.sourceforge.net> > 
https://lists.sourceforge.net/lists/listinfo/emc-users> >>> 
___> Emc-users mailing list> 
Emc-users@lists.sourceforge.net> 
https://lists.sourceforge.net/lists/listinfo/emc-users>-- Chris 
AlbertsonRedondo Beach, 
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Re: [Emc-users] Spindle Control

[johnd]

I don't disagree that for complex parts like your example 3D printing is an 
amazing way to do this. I'll bet though if you went out to buy say a drill 
press and had a choice between one that had been cast with ugly rough 3D 
printed castings and one that had smooth pattern created castings you'd choose 
the nicer one?John. Sent from my Samsung S10
 Original message From: Chris Albertson 
 Date: 2021-06-15  11:24 a.m.  (GMT-08:00) To: 
"Enhanced Machine Controller (EMC)"  Subject: 
Re: [Emc-users] Spindle Control On Tue, Jun 15, 2021 at 9:41 AM John Dammeyer 
wrote:> Before the extruded plastic 3D printing that 
was the type of 3D printer I> was considering.  The hobby approach was to use 
ink jet nozzles for> printing a crazy glue type material onto starch layers.>> 
Material costs would not be cheap.  Then came pla printing and I've not> looked 
back.  I've printed a number of PLA patterns but they always get the> 
woodworking treatment so they are never lost-pla.>> John>>> > -Original 
Message-> > From: andy pugh [mailto:bodge...@gmail.com]> > Sent: June-15-21 
7:26 AM> > To: Enhanced Machine Controller (EMC)> > Subject: Re: [Emc-users] 
Spindle Control> >> > On Tue, 15 Jun 2021 at 15:21, Roland Jollivet 
> wrote:> >> > > Which often makes me wonder why 
guys aren't CNC machining the moulds> rather.> > > You'd have a simple CNC mill 
where the tool sticks directly upwards,> and> > > use a dremel as a spindle.> > 
> Now you just 'machine' away the green sand until done.>Why would you CNC a 
mould when you could print one?  The printer does notwaste material and it is 
very fast because there is no machining required.  But more importently some 
moulds can not be CNC machined or rather youmight be forced to re-design you 
part based on the limitations of the CNCmachne.    For example JUST TRY to CNC 
a mold for this part.    It is areal part I made for a power steering unit for 
robot car.  I doubt it couldbe CNC machined.  But it could be 3D printed and 
cast in metal.  (This isthe main chassis that holds the motor, gears and some 
electronics.  In usethere are covers to keep water and dirt out.  Butthis 
inside is designedfor minium use of materials and is not buildable with CNC,  
Look at thebrown part, I forget to remove some other parts.)[image: 
Untitled.jpeg.jpeg]> >> >> > We have a couple of these at work: 
https://youtu.be/s6OJx_PKoTk> >> > --> > 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, 1912> >> >> > ___> > 
Emc-users mailing list> > Emc-users@lists.sourceforge.net> > 
https://lists.sourceforge.net/lists/listinfo/emc-users 
___> Emc-users mailing list> 
Emc-users@lists.sourceforge.net> 
https://lists.sourceforge.net/lists/listinfo/emc-users>-- Chris 
AlbertsonRedondo Beach, 
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Re: [Emc-users] Pi4 issues with MESA 7i92H

[johnd]

When I get back from doggy walk I'll try switching off wifi.   Odd that 
LinuxCNC works though. Sent from my Samsung S10
 Original message From: Gene Heskett  
Date: 2021-06-11  11:04 a.m.  (GMT-08:00) To: emc-users@lists.sourceforge.net 
Subject: Re: [Emc-users] Pi4 issues with MESA 7i92H On Friday 11 June 2021 
12:05:38 John Dammeyer wrote:> Sam,> Here's the ifconfig output generated from 
putty running on my WIN-7> workstation via remote desktop from my WIN-10 ZBook. 
 Ethernet cable> from Pi4 to 7i92 is 2' long.>> And with or without LinuxCNC 
running this is what I get:> pi@linuxcnc:~ $ cd mesaflash> 
pi@linuxcnc:~/mesaflash $ sudo ./mesaflash --device 7i92 --readhmid> 
lbp16_access.send_packet: Operation not permitted> Aborted>> John>> 
pi@linuxcnc:~ $ ifconfig> eth0: flags=4163  mtu 
1500> inet 192.168.1.1  netmask 255.255.255.0  broadcast> 192.168.1.255 
ether dc:a6:32:1e:30:f1  txqueuelen 1000  (Ethernet)> RX packets 
29442387  bytes 2826463726 (2.6 GiB)> RX errors 0  dropped 0  overruns 
0  frame 0> TX packets 58886151  bytes 1122489823 (1.0 GiB)> TX 
errors 0  dropped 0 overruns 0  carrier 0  collisions 0>> lo: 
flags=73  mtu 65536> inet 127.0.0.1  netmask 
255.0.0.0> inet6 ::1  prefixlen 128  scopeid 0x10> loop  
txqueuelen 1000  (Local Loopback)> RX packets 595  bytes 40144 (39.2 
KiB)> RX errors 0  dropped 0  overruns 0  frame 0> TX packets 
595  bytes 40144 (39.2 KiB)> TX errors 0  dropped 0 overruns 0  carrier 
0  collisions 0>> wlan0: flags=4163  mtu 1500>  
   inet 192.168.0.97  netmask 255.255.255.0  broadcast> 192.168.0.255 inet6 
fe80::9d66:1b85:f539:da50  prefixlen 64  scopeid> 0x20 ether 
dc:a6:32:1e:30:f2  txqueuelen 1000  (Ethernet)> RX packets 9  bytes 
3535970 (3.3 MiB)> RX errors 0  dropped 0  overruns 0  frame 0> 
TX packets 3108  bytes 415864 (406.1 KiB)> TX errors 0  dropped 0 
overruns 0  carrier 0  collisions 0I see one possibility, Ralph.This doesn't 
show the default route. But "ip r" will. You are eth0 at 192.168.1.x and wlan0 
at 192.168.0.x. If the default route is thru wlan0, mesaflash will probably 
fail.I'm using a 7i90 over spi, so my eth0 or whatever name its using this week 
is free for normal use, but that's just one of the reasons I keep the #@%## 
radios turned off, once avahi gets it in its mind to use the radio, ip can't or 
won't fix it, so you have to manually nuke the avahi executable and reboot. In 
your case, rename it to rumplestiltskin or whatever so you can restore it if 
I'm wrong.Take care and stay well.[...]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)If we desire respect for the law, we 
must first make the law respectable. - Louis D. BrandeisGenes Web page 
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Re: [Emc-users] Pi4 issues with MESA 7i92H

[johnd]

Latest github version. Sent from my Samsung S10
 Original message From: Ralph Stirling 
 Date: 2021-06-11  11:04 a.m.  (GMT-08:00) To: 
"Enhanced Machine Controller (EMC)"  Subject: 
Re: [Emc-users] Pi4 issues with MESA 7i92H Old version of mesaflash perhaps?On 
Jun 11, 2021 10:06 AM, John Dammeyer  wrote:CAUTION: 
This email originated from outside the Walla Walla University email system.> 
From: Ralph Stirling [mailto:ralph.stirl...@wallawalla.edu]>> I have no problem 
using 192.168.1.1 for eth0 on pi4 with 7i92.I don't either with LinuxCNC moving 
motors.  But it's the mesaflash software that is having an issue.  But only on 
a Pi.  I've downloaded the software from github on a PC, Beagle and Pi4.  Only 
on the Pi4 does it have issues.Now I can use the PC or the Beagle to flash the 
appropriate pin file into the Pi4 but that's not really the point here.  Very 
puzzled.John>> On Jun 11, 2021 9:30 AM, Sam Sokolik  
wrote:> CAUTION: This email originated from outside the Walla Walla University 
email system.>>> That would be something to try..  Maybe mesaflash doesn't know 
how to> handle the 192.168.1.1 ip address?  Set the pie to something else like> 
192.168.1.10>> On Fri, Jun 11, 2021 at 11:25 AM Mark Wendt 
 wrote:>> > On Fri, Jun 11, 2021 at 12:09 PM John 
Dammeyer > > wrote:> >> > > Sam,> > > Here's the 
ifconfig output generated from putty running on my WIN-7> > > workstation via 
remote desktop from my WIN-10 ZBook.  Ethernet cable from> > > Pi4 to 7i92 is 
2' long.> > >> > > And with or without LinuxCNC running this is what I get:> > 
> pi@linuxcnc:~ $ cd mesaflash> > > pi@linuxcnc:~/mesaflash $ sudo ./mesaflash 
--device 7i92 --readhmid> > > lbp16_access.send_packet: Operation not 
permitted> > > Aborted> > >> > > John> > >> > > pi@linuxcnc:~ $ ifconfig> > > 
eth0: flags=4163  mtu 1500> > > inet 
192.168.1.1  netmask 255.255.255.0  broadcast 192.168.1.255> > > ether 
dc:a6:32:1e:30:f1  txqueuelen 1000  (Ethernet)> > > RX packets 29442387 
 bytes 2826463726 (2.6 GiB)> > > RX errors 0  dropped 0  overruns 0  
frame 0> > > TX packets 58886151  bytes 1122489823 (1.0 GiB)> > >   
  TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0> > >> > > lo: 
flags=73  mtu 65536> > > inet 127.0.0.1  netmask 
255.0.0.0> > > inet6 ::1  prefixlen 128  scopeid 0x10> > >
 loop  txqueuelen 1000  (Local Loopback)> > > RX packets 595  bytes 
40144 (39.2 KiB)> > > RX errors 0  dropped 0  overruns 0  frame 0> > >  
   TX packets 595  bytes 40144 (39.2 KiB)> > > TX errors 0  dropped 
0 overruns 0  carrier 0  collisions 0> > >> > > wlan0: 
flags=4163  mtu 1500> > > inet 
192.168.0.97  netmask 255.255.255.0  broadcast 192.168.0.255> > > inet6 
fe80::9d66:1b85:f539:da50  prefixlen 64  scopeid 0x20> > > ether 
dc:a6:32:1e:30:f2  txqueuelen 1000  (Ethernet)> > > RX packets 9  
bytes 3535970 (3.3 MiB)> > > RX errors 0  dropped 0  overruns 0  frame 
0> > > TX packets 3108  bytes 415864 (406.1 KiB)> > > TX errors 
0  dropped 0 overruns 0  carrier 0  collisions 0> > >> > > pi@linuxcnc:~ $> > 
>> >> > Do you have any other network devices on the 192.168.1.x network?  The> 
> 192.168.1.1 address is usually reserved for routers in that subnet.> >> > 
Mark> >> > ___> > Emc-users mailing 
list> > Emc-users@lists.sourceforge.net> > 
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Re: [Emc-users] Rotary axis preview (in axis interface)

[johnd]

I changed it to _feed1 and then the program ran. Info output at 10, 20, 30..  
Looks like it carves the numbers first.   Rotary axis does appear to move 10 
degrees for each info message. Screen output a bit strange. Metric maybe?On 
doggy walk.  Will check further when I get back. ThanksJohnSent from my Samsung 
S10
 Original message From: Sam Sokolik  Date: 
2021-03-31  9:59 a.m.  (GMT-08:00) To: "Enhanced Machine Controller (EMC)" 
 Subject: Re: [Emc-users] Rotary axis preview 
(in axis interface) I think you grabbed the old version - at the top of the 
post he has a linkto the end of the post...  
:)https://forum.linuxcnc.org/20-g-code/27169-g-code-to-engrave-numbers-on-cylinders?start=10#116888Maybe
 <_feed> wasn't used the way it is now in 2018  It now seems to bea read 
only variable for current feed setting.On Wed, Mar 31, 2021 at 11:35 AM John 
Dammeyer wrote:> Let me ask this question again with a 
bit more information.>> I downloaded the G-Code for the scale and Linux fails 
with "cannot assign> read only parameter" on the #=20 line.  It made it 
through the rest> first few assignments.  I looked at the file with and the 
lines are only> terminated with a 0x0A.  No odd characters in the file.  What 
could be> wrong?>> Thanks> John>> ;Attempt to engrave scale rings> ;Engraving 
is done in the XA plane and in the postive direction from X =0>> #<_dia> = 50 ; 
scale diamter> #<_depth> = 0.2 ; engraving depth> #<_height> = 2 ; character 
height> #<_scale> = 1 ; unit conversion> #<_inc> = 10 ; angle between marks> 
#<_feed> = 20>> G21>> F #<_feed>> 
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Re: [Emc-users] Spindle speed changes with threading.

[johnd]

What's the resolution of your spindle encoder and base period servo period?Sent 
from my Samsung S10
 Original message From: Jon Elson  
Date: 2021-02-05  10:56 a.m.  (GMT-08:00) To: "Enhanced Machine Controller 
(EMC)"  Subject: Re: [Emc-users] Spindle speed 
changes with threading. On 02/05/2021 10:07 AM, Gene Heskett wrote:>> You have 
my curiosity bump itching Jon, When I get my stuff back together> on the GO704, 
and get my new 'scope unpacked, I'll take a look at the> step drive output and 
answer that itch.You actually should be able to check this out with Halscope.  
Look at the velocity or step ratefor the Z axis, and trigger on 
spindle.0.index-enable or whatever it is called on your LinuxCNC version.    If 
what I said was right, velocity should go higher than the required Z feedrate 
fora moment right after the spindle encoder gets the index pulse, and then 
settle down to the required feedrate for that thread pitch.Love that rigid 
tapping!  I just did 160 holes, with a spot drilling step, then a drill through 
step, and finally tapping some 6-32 and 2-56 holes.  It is kind of scary 
watching a 6-32 tap plunge in at1000 RPM and 32 IPM feedrate.  Taps the hole in 
barely a second!Jon___Emc-users 
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