Re: [Emc-users] Is there a better way - G76 for plain bearing lubricating grooves

[gene heskett]

On Tuesday, March 1, 2022 5:56:08 PM EST Peter Hodgson wrote:
> I've offered to make some bronze bearings for a vintage British
> motorbike club.
> 
> The bearings have some helical oil grooves on one half of the inner
> diameter.
> 
> I thought I could do this with G76 having the pitch twice the length of
> the bush.
> 
> G0 X15. Z10.
> G76 P42.0 Z-25. I0.88 J0.3 K1.0 Q29.5 H1 L0 R1.5
> 
> The problem is that the spindle, run via a VFD needs to turn at only 50
> RPM to be able to have enough velocity on the Z stepper to achieve the
> correct pitch and the spindle doesn't seem to be stable enough or have
> enough torque at those revs to give a cosistent cut.
> 
> Does anybody have any ideas how I can check or make the G76 more stable
> at low revs?
> 
That will depend on the resolution of the spindles encoder, however the Z 
will follow the encoder fairly accuratly if the resolution is there. I 
can set my vfd for 5 hz, which has no feedback from the encoder, and even 
if the vfd "slipage" is 50%, g76 follows accuratly enough to cut a 
useable thread. My encoder tries to be a quadrature, watching the 60 
tooth bull gear, so it has 240 timing edges per rev. You may hear Z 
sputtering and stuttering, but the thread is pretty good. Torque at that 
speed may need help, but I limit the current boost the vfd can do the the 
FLA listed on the motors nameplate, so low speed heating has never been a 
problem. Much of course depends on how you've programmed the vfd, which 
AFAIAC, is totally fubared at out of the box settings. The vfd I've found 
CAN BE quite compliant to your wishes, thats how I can reverse its 
direction while turning 100 revs w/o the backgear, with a 40 lb 8" chuck 
mounted, with .25 turn of over shoot after motion issues the reverse 
command.
 
> Thanks,
> 
> Pete
> 
> 
> 
> ___
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> .


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, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 





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Re: [Emc-users] Is there a better way - G76 for plain bearing lubricating grooves

[andy pugh]

On Tue, 1 Mar 2022 at 22:59, Peter Hodgson  wrote:

> The problem is that the spindle, run via a VFD needs to turn at only 50
> RPM to be able to have enough velocity on the Z stepper to achieve the
> correct pitch and the spindle doesn't seem to be stable enough or have
> enough torque at those revs to give a cosistent cut.

How many slots in the encoder? It should be possible to turn the
spindle by hand and get a stable cut...

In fact, turning the spindle by hand might be the answer to the low
torque issue. It is something that I have done in the past.
(In this video I have actually connected the table lift handle for the
mill to the back of the lathe spindle, the motor is turned off:
https://youtu.be/T4q8gCpeY1A?t=30 )

-- 
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


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Re: [Emc-users] Recommendations for touch pad to replace mouse

[Chris Albertson]

All of them, from those very cheap keyboards Andy found to the best
top-of-the-line Apple glass trackpads, are "plug and play" as long as you
use the USB connection.

On Tue, Mar 1, 2022 at 3:14 PM Martin Dobbins  wrote:

> Hi Andy,
>
> Are those reasonably easy to setup?
>
> thanks,
>
> Martin
>
> 
> From: andy pugh 
>
>
> On Mon, 28 Feb 2022 at 21:44, Ed  wrote:
> >
> > Title says most of it. For most commands I use the keyboard for the
> > speed but changing the tooltable and a couple of other things I like to
> > use a touchpad.
>
> I use a touchscreen, and then in a holster in the side of the machine
> I have an older version of this:
> https://www.amazon.co.uk/Rii-K01X1-Mini-Wireless-Keyboard/dp/B01G6XGLQQ
> Which offers a touchpad and a keyboard. It's actually pretty usable,
> though I might go for something similar but bigger for more extensive
> use.
>
> --
> 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
>
>
> ___
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> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>
> ___
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> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Recommendations for touch pad to replace mouse

[Martin Dobbins]

Hi Andy,

Are those reasonably easy to setup?

thanks,

Martin


From: andy pugh 


On Mon, 28 Feb 2022 at 21:44, Ed  wrote:
>
> Title says most of it. For most commands I use the keyboard for the
> speed but changing the tooltable and a couple of other things I like to
> use a touchpad.

I use a touchscreen, and then in a holster in the side of the machine
I have an older version of this:
https://www.amazon.co.uk/Rii-K01X1-Mini-Wireless-Keyboard/dp/B01G6XGLQQ
Which offers a touchpad and a keyboard. It's actually pretty usable,
though I might go for something similar but bigger for more extensive
use.

--
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


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Re: [Emc-users] Is there a better way - G76 for plain bearing lubricating grooves

[Peter C. Wallace]

On Tue, 1 Mar 2022, Peter Hodgson wrote:


Date: Tue, 1 Mar 2022 22:56:08 +
From: Peter Hodgson 
Reply-To: phodg...@uk22.net,
"Enhanced Machine Controller (EMC)" 
To: "'Enhanced Machine Controller (EMC)'" 
Subject: [Emc-users] Is there a better way - G76 for plain bearing lubricating
 grooves

I've offered to make some bronze bearings for a vintage British motorbike 
club.


The bearings have some helical oil grooves on one half of the inner diameter.

I thought I could do this with G76 having the pitch twice the length of the 
bush.


G0 X15. Z10.
G76 P42.0 Z-25. I0.88 J0.3 K1.0 Q29.5 H1 L0 R1.5

The problem is that the spindle, run via a VFD needs to turn at only 50 RPM 
to be able to have enough velocity on the Z stepper to achieve the correct 
pitch and the spindle doesn't seem to be stable enough or have enough torque 
at those revs to give a cosistent cut.


Does anybody have any ideas how I can check or make the G76 more stable at 
low revs?


Thanks,

Pete




More encoder resolution?




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Peter Wallace
Mesa Electronics



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[Emc-users] Is there a better way - G76 for plain bearing lubricating grooves

[Peter Hodgson]

I've offered to make some bronze bearings for a vintage British 
motorbike club.


The bearings have some helical oil grooves on one half of the inner 
diameter.


I thought I could do this with G76 having the pitch twice the length of 
the bush.


G0 X15. Z10.
G76 P42.0 Z-25. I0.88 J0.3 K1.0 Q29.5 H1 L0 R1.5

The problem is that the spindle, run via a VFD needs to turn at only 50 
RPM to be able to have enough velocity on the Z stepper to achieve the 
correct pitch and the spindle doesn't seem to be stable enough or have 
enough torque at those revs to give a cosistent cut.


Does anybody have any ideas how I can check or make the G76 more stable 
at low revs?


Thanks,

Pete



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Re: [Emc-users] Q for Peter?

[Chris Albertson]

There are options that do not involve replacing a small part.

(1) just add an external low side resister (SMT parts are easy to remove) or
(2) if the pressure sensor is actually a pressure-sensitive resister, then
run it with more than 5 Volts.

On Tue, Mar 1, 2022 at 9:40 AM gene heskett  wrote:

> On Tuesday, March 1, 2022 11:55:26 AM EST andy pugh wrote:
> > On Tue, 1 Mar 2022 at 16:25, Peter C. Wallace  wrote:
> > > Not with firmware but you could replace the low side resistor network
> > > on the first 4 inputs with say 22K (was 1.8K) to get about a 5V full
> > > scale range
> > Or, less intrusively, boost the signal with an Op-Amp powered from the
> > field power?
>
> I've considered that, Andy, unforch field power isn't high enough voltage
> at 12 volts on that machine. But that doesn't mean a voltage booster
> won't take up residence there.
>
> 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, 1940)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
>
>
>
>
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Recommendations for touch pad to replace mouse

[andy pugh]

On Mon, 28 Feb 2022 at 21:44, Ed  wrote:
>
> Title says most of it. For most commands I use the keyboard for the
> speed but changing the tooltable and a couple of other things I like to
> use a touchpad.

I use a touchscreen, and then in a holster in the side of the machine
I have an older version of this:
https://www.amazon.co.uk/Rii-K01X1-Mini-Wireless-Keyboard/dp/B01G6XGLQQ
Which offers a touchpad and a keyboard. It's actually pretty usable,
though I might go for something similar but bigger for more extensive
use.

-- 
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


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Re: [Emc-users] LCNC vs bullseye on rpi4?

[Chris Albertson]

It is easy to install 3.7 First use "python3 -m vend "  then
"source /bin/activate" then install the version of
python you like and whatever version of the packages you want.  That's it.
Now you have a vertical environment.

In fact, almost every Python developer does this is it is generally a
really bad idea to run with the default Python that comes with the OS.



On Tue, Mar 1, 2022 at 5:46 AM gene heskett  wrote:

> Greetings all;
>
> Any progress on that? The python is too new. Buster is just fine with its
> python-3.7, but bullseye has python-3.9.2 and breaks it.
>
> 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, 1940)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
>
>
>
>
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Custom m codes

[Nicklas SB Karlsson]

Den 2022-02-28 kl. 11:47, skrev andrew beck:

Hey guys

I want to issue a m102

And get this code run

S5m3
Halcmd setp hm2 7i77etc pin output on

Motion module have digital outputs.


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Re: [Emc-users] Q for Peter?

[gene heskett]

On Tuesday, March 1, 2022 11:55:26 AM EST andy pugh wrote:
> On Tue, 1 Mar 2022 at 16:25, Peter C. Wallace  wrote:
> > Not with firmware but you could replace the low side resistor network
> > on the first 4 inputs with say 22K (was 1.8K) to get about a 5V full
> > scale range
> Or, less intrusively, boost the signal with an Op-Amp powered from the
> field power?

I've considered that, Andy, unforch field power isn't high enough voltage 
at 12 volts on that machine. But that doesn't mean a voltage booster 
won't take up residence there.

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, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 





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Re: [Emc-users] Q for Peter?

[gene heskett]

On Tuesday, March 1, 2022 11:21:16 AM EST Peter C. Wallace wrote:
> On Mon, 28 Feb 2022, gene heskett wrote:
> > Date: Mon, 28 Feb 2022 20:11:35 -0500
> > From: gene heskett 
> > Reply-To: "Enhanced Machine Controller (EMC)"
> > 
> > 
> > 
> > To: "Enhanced Machine Controller (EMC)"
> >  Subject: [Emc-users] Q for Peter?
> > 
> > Greetings Peter;
> > 
> > The 7i76 has, I recall reading, the ability to do analog to digital
> > conversions on the first 4 of its inputs. But the full scale range is
> > 36 volts if I recall right.  I don't recall the bit range, though,
> > whether its 8 bit, or 16.
> > 
> > Would it be possible to lower the full scale range to 0-5 volts with
> > a
> > firmware change?
> > 
> > I have acquired a couple pressure sensors rated at 0-10 psi with a 5
> > volt input, .5 to 4.5 volt outbut and want to use them to monitor,
> > and control the speed by pwm means as the mister(s) only need 3 or 4
> > psi to do their job if the nozzle is close enough to the cutting
> > face. Inch or so.
> > 
> > Thanks Peter, take care and stay well.
> > 
> > Cheers, Gene Heskett.
> 
> Not with firmware but you could replace the low side resistor network
> on the first 4 inputs with say 22K (was 1.8K) to get about a 5V full
> scale range

And those are I assume, surface mount grain of sand? 

I'll have to look, and my eyes are starting to fade.

Thanks Peter, stay well now.

> Peter Wallace
> Mesa Electronics
> 
> (\__/)
> (='.'=) This is Bunny. Copy and paste bunny into your
> (")_(") signature to help him gain world domination.

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, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 





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Re: [Emc-users] Q for Peter?

[andy pugh]

On Tue, 1 Mar 2022 at 16:25, Peter C. Wallace  wrote:

> Not with firmware but you could replace the low side resistor network on the
> first 4 inputs with say 22K (was 1.8K) to get about a 5V full scale range

Or, less intrusively, boost the signal with an Op-Amp powered from the
field power?

-- 
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


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Re: [Emc-users] Q for Peter?

[Peter C. Wallace]

On Mon, 28 Feb 2022, gene heskett wrote:


Date: Mon, 28 Feb 2022 20:11:35 -0500
From: gene heskett 
Reply-To: "Enhanced Machine Controller (EMC)"

To: "Enhanced Machine Controller (EMC)" 
Subject: [Emc-users] Q for Peter?

Greetings Peter;

The 7i76 has, I recall reading, the ability to do analog to digital
conversions on the first 4 of its inputs. But the full scale range is 36
volts if I recall right.  I don't recall the bit range, though, whether
its 8 bit, or 16.

Would it be possible to lower the full scale range to 0-5 volts with a
firmware change?

I have acquired a couple pressure sensors rated at 0-10 psi with a 5 volt
input, .5 to 4.5 volt outbut and want to use them to monitor, and control
the speed by pwm means as the mister(s) only need 3 or 4 psi to do their
job if the nozzle is close enough to the cutting face. Inch or so.

Thanks Peter, 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, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page 




Not with firmware but you could replace the low side resistor network on the 
first 4 inputs with say 22K (was 1.8K) to get about a 5V full scale range







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Peter Wallace
Mesa Electronics

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.



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[Emc-users] LCNC vs bullseye on rpi4?

[gene heskett]

Greetings all;

Any progress on that? The python is too new. Buster is just fine with its  
python-3.7, but bullseye has python-3.9.2 and breaks it.

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, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 





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