-velocity bounces around so we filter it with lowpass
> >>>>> # spindle-velocity is signed so we use absolute component to remove
> >>>>> sign # ACTUAL velocity is in RPS not RPM so we scale it.
> >>>>>
> >>>>> setp
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
<>>>
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 restrained by the steady. I can't
remember what the tailstock is like on a Cra
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 LinuxCN
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 larg
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
els
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
)
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 behavior.
This one
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. T
, bore to 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 is
Dammeyer
Sent: June 18, 2021 11:49 AM
To: Enhanced 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
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 o
21 9:50 AM
> To: 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
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 en
ell above 1000
now.
> > -Original 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
ed <= spindle-near-speed.out => 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 questi
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
hen this is true motion will start. The LED
> > 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
> >
> > &
vel X times per 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
>
trical noise
inside 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
ible on the halscope.
> > -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
> >
> > Ther
hris 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 noise,
1) electrical noise superimposed on the signal.
2) quantization noise from the sampling process. What happens h
hanks
John
> -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
&
lbertson.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 noise,
> > 1) electrical noise superimposed on the signal.
> > 2) quantization noise fr
quadrature 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
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-
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
sn't 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
> >
of the way quadrature 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
> >>
> >>
> >>> -Origin
centrifugal force on the unsupported length can bend it easily if the
RPM is high enough
Dave Caroline
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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
>
>
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
-
2009/7/22 Rich Amaral :
> I have a Craftsman professional lathe (much like an Atlas) in decent
> shape. After turning both ends to size, I discovered the screw became
> warped (about 37 thousandths, a noticeable amount). I don't think the
> screw was warped before, although I'm not 100% sure.
As
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 like
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
> st
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