rature works, with the A/B phasing
> you
> >> don't get the same types of errors compared to polling a bit level X
> times
> >> per second and trying to decide when it's high/low.
> >>
> >> John
> >>
> >>
> >>> -Original Message-
&g
the 7i92 FPGA deal with quadrature encoders and
> > >> therefore doesn't really need to deal with a sampling process but
> > >> instead looks at edges? And because of the way quadrature works,
> > >> with the A/B phasing
> >
> > you
> >
> > >
On Tue, 22 Jun 2021 at 07:09, Chris Albertson wrote:
> Quantization happens even in an electrically quiet
> environment and results from design decisions made such as the sample
> interval, number of lines of the sensor, and the rotation speed. It gets
> worse as you go slower.
I believe that
; you
> >> don't get the same types of errors compared to polling a bit level X
> times
> >> per second and trying to decide when it's high/low.
> >>
> >> John
> >>
> >>
> >>> -Original Message-
> >>> From: C
ass
> >>>>> # spindle-velocity is signed so we use absolute component to remove
> >>>>> sign # ACTUAL velocity is in RPS not RPM so we scale it.
> >>>>>
> >>>>> setp scale.spindle.gain 60
> >>>>>
works, with the A/B phasing you
>> don't get the same types of errors compared to polling a bit level X times
>> per second and trying to decide when it's high/low.
>>
>> John
>>
>>
>>> -Original Message-
>>> From: Chris Alber
.com]
> > Sent: June-19-21 3:21 PM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Machining question
> >
> > There are two kinds of noise,
> > 1) electrical noise superimposed on the signal.
> > 2) quantization noise from the sampling proc
> -Original Message-
> From: dave engvall [mailto:dengv...@charter.net]
> Sent: June-20-21 7:55 AM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Machining question
>
> On the Z for my Cinci I cheat by running the encoder off a small idler
> dr
...@gmail.com]
Sent: June-19-21 3:21 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Machining question
There are two kinds of noise,
1) electrical noise superimposed on the signal.
2) quantization noise from the sampling process. What happens here
is that the computer counts
.
> > -Original Message-
> > From: Chris Albertson [mailto:albertson.ch...@gmail.com]
> > Sent: June-19-21 3:21 PM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Machining question
> >
> > There are two kinds of n
side the electronics dropped low enough to no longer cause issues.
> -Original Message-
> From: Gene Heskett [mailto:ghesk...@shentel.net]
> Sent: June-19-21 2:53 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Machining question
>
> On Saturday 19 June 20
second and
trying to decide when it's high/low.
John
> -Original Message-
> From: Chris Albertson [mailto:albertson.ch...@gmail.com]
> Sent: June-19-21 3:21 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Machining question
>
> There are tw
gt; > in the pyvcp-panel.xml is renamed to be a LED. net
> > spindle-near-speed-led <= spindle-near-speed.out => spindle.0.at-speed
> > = end HAL code ===
> >
> > John
> >
> > > -Original Message-
> &
end HAL code ===
>
> John
>
> > -Original Message-
> > From: andy pugh [mailto:bodge...@gmail.com]
> > Sent: June-19-21 2:48 AM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Machining questi
t; spindle.0.at-speed
= end HAL code ===
John
> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: June-19-21 2:48 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Machining question
>
> On Sat, 19 Jun 2021 a
ginal Message-
> > From: John Dammeyer [mailto:jo...@autoartisans.com]
> > Sent: June-18-21 3:51 PM
> > To: 'Enhanced Machine Controller (EMC)'
> > Subject: Re: [Emc-users] Machining question
> >
> > Andy's approach is what I had in mind. Additionally I
On Sat, 19 Jun 2021 at 07:11, John Dammeyer wrote:
>
> I'm finding the AXIS Spindle speed oscillates about +/- 5 RPM. I thought
> that I was filtering it.
It generally needs to be filtered, but it is possible you are
filtering it, but not enough to get a steady reading.
For whatever reason
Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Machining question
>
> On Fri, 18 Jun 2021 at 16:52, John Dammeyer wrote:
>
> > I'm thinking the better approach would be to drill all the way through
> > undersize 3/8" and then drill half way with 13mm. The
Hi
The way I see the picture, you have quite a few microns of play only in
the roughness of the hole.
Using the screws that way amplifies the problem, as is pushes all the
error to one side.
I think the best option is to buy an elastic coupling. Ideally one that
fits both sizes, but just
hanced Machine Controller (EMC)
Subject: [Emc-users] Machining question
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 be
reamer
alloance and then ream.
https://www.fltechnical.com/news/reamer-guide-basic-technical-information-for-reamers
Gerrit
-Original Message-
From: John Dammeyer
Sent: June 18, 2021 11:49 AM
To: Enhanced Machine Controller (EMC)
Subject: [Emc-users] Machining question
This isn't as muc
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.
: [Emc-users] Machining question
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
On Fri, 18 Jun 2021 at 16:52, John Dammeyer wrote:
> 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.
I would drill 8.5mm then
By total coincidence, I am doing the exact same thing. I just bought a 600
line optical encoder and now I'm attaching it directly to a motor. The
purpose is to write and debug some control software. In this case, I
REALLY DO WANT to run at the encoder's maximum rated speed of 5000 RPM, or
I think it is best to back up and look at the bigger picture. Solid
couplers are almost never the way to go. Or if you do use a solid couple
the motor or encoders needs to be mounted with rubber bushings.I
shouldn't be 100% solid.
Buy one of these, then bore of one of the holes for the
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
Hey guys,
This is purely a machining question.
I'm currently retrofitting the lead screws on my home built cnc router
with ACME thread screws. Yes, I run EMC2. The screws are about 3 feet
long by 3/8 in and need to be turned a bit at either end to fit the
stepper motor coupling and bearing
centrifugal force on the unsupported length can bend it easily if the
RPM is high enough
Dave Caroline
--
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
Rich Amaral wrote:
Hey guys,
This is purely a machining question.
I'm currently retrofitting the lead screws on my home built cnc router
with ACME thread screws. Yes, I run EMC2. The screws are about 3 feet
long by 3/8 in and need to be turned a bit at either end to fit the
stepper
A fabricated bushing as mentioned, split if need be. Indicate the work if
a jaw chuck is used,
and
A bushing at the left end of the headstock to hold the rod true is advised.
That said, a three foot long piece of 3/8th rod is not likely to be
straight.
EVER.
CalG
nothing that looked too bad, at least to me.
Could this have warped the screw?
That would almost certainly cause the screw to bend
What you should do is use a fixed steady on the lathe bed
and have maybe 2/3 of the screw sticking out of the chuck
with its free end being
On Wednesday 22 July 2009, cmg...@sover.net wrote:
A fabricated bushing as mentioned, split if need be. Indicate the work if
a jaw chuck is used,
and
A bushing at the left end of the headstock to hold the rod true is advised.
That said, a three foot long piece of 3/8th rod is not likely to
Rich Amaral wrote:
Hey guys,
This is purely a machining question.
I'm currently retrofitting the lead screws on my home built cnc router
with ACME thread screws. Yes, I run EMC2. The screws are about 3 feet
long by 3/8 in and need to be turned a bit at either end to fit the
stepper
34 matches
Mail list logo
