Re: [Emc-developers] MPG Jogging Off of a Limit

[John Thornton]

Yep, I can jog off the limits in both touchy and Axis with the MPG

JT


On 5/24/2016 3:47 AM, andy pugh wrote:
> Should it be possible to jog off of a limit with an MPG?
> I have never managed to, and on my new lathe it takes a bit of
> dismantling to get to the screws to manually rotate the screw.
>
> Of course, when the machine is properly set up, this should never happen.
>


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Re: [Emc-developers] MPG Jogging Off of a Limit

[John Thornton]

Yes, I think I do that on the CHNC lathe, but I can verify...

JT


On 5/24/2016 3:47 AM, andy pugh wrote:
> Should it be possible to jog off of a limit with an MPG?
> I have never managed to, and on my new lathe it takes a bit of
> dismantling to get to the screws to manually rotate the screw.
>
> Of course, when the machine is properly set up, this should never happen.
>


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Re: [Emc-developers] MPG Jogging Off of a Limit

[andy pugh]

On 24 May 2016 at 16:03, Jeff Johnson  wrote:
> Yes with the MPG...just went out and did it to make sure.

In that case it seems to confirm that it is because I only have one
sensor for both ends.

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Re: [Emc-developers] MPG Jogging Off of a Limit

[sam sokolik]

our over travel limits actually kill power to the drives...  (same as 
the estop loop)

sam

On 5/24/2016 10:03 AM, Jeff Johnson wrote:
> Yes with the MPG...just went out and did it to make sure.
>
> Jeff Johnson
> john...@superiorroll.com
> Superior Roll & Turning
> 734-279-1831
>
> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: Tuesday, May 24, 2016 9:25 AM
> To: EMC developers 
> Subject: Re: [Emc-developers] MPG Jogging Off of a Limit
>
> On 24 May 2016 at 13:55, johnson  wrote:
>> We use ignore limits and we can jog off.
> With an MPG?
>
> --
> 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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> their own devices (BYOD) to work are irked by the imposition of MDM 
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Re: [Emc-developers] MPG Jogging Off of a Limit

[andy pugh]

On 24 May 2016 at 14:56, Chris Radek  wrote:
> I assume you're asking because you use Touchy and don't have
> continuous jog buttons.

Yes, exactly.

Though the lathe is likely to end up with a modified Touchy, as I have
separate X and Z jogwheels and a knob to select the jog size.
 I also plan on two other mpgs for speed and spindle override, or
possibly each will be selectable to do different things, I haven't
decided yet.

-- 
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-developers] MPG Jogging Off of a Limit

[Chris Radek]

On Tue, May 24, 2016 at 02:24:50PM +0100, andy pugh wrote:
> On 24 May 2016 at 13:55, johnson  wrote:
> > We use ignore limits and we can jog off.
> 
> With an MPG?

I think "override limits" only lets you do a continuous jog.  It
might allow incremental but I'm not sure.  It is smart about only
letting you jog in the direction that solves the problem, which is a
thing that the MPG jogging isn't set up to do.

I assume you're asking because you use Touchy and don't have
continuous jog buttons...  Other than adding them (or poking those
inputs with halcmd) I'm not sure what to suggest.  Touchy *does*
have the override limit button to let you turn the machine on.


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Re: [Emc-developers] MPG Jogging Off of a Limit

[andy pugh]

On 24 May 2016 at 15:19, John Kasunich  wrote:
>
> Do you have separate limit switches and separate inputs?  If so, it should
> work.
>
> If not, I'd suggest some HAL logic to let you push a button and block the
> limit switch signal(s) before they enter the motion module.

I don't have separate limits, as the sensor is in the carriage and has
two targets rather than there being two sensors.

The simplest solution on the rare occasions that it happens is
probably to unlink the signals with halcmd.


-- 
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
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Re: [Emc-developers] MPG Jogging Off of a Limit

[John Kasunich]

Yes, it should be possible, IF you have separate switches for positive and
negative limit.

Code is at
http://git.linuxcnc.org/gitweb?p=linuxcnc.git;a=blob;f=src/emc/motion/control.c;h=ea47096f91a9e0b7dcf7c898ddae326b287721f3;hb=HEAD

The limit switch HAL pins are read at line 448

Code at line 634 implements limit overrides, but that ONLY prevents the
joint from faulting.

The jogwheel handling code starts at line 835.

Lines 891-897 determine which way you turned the wheel and test against 
the appropriate limit switch.

Note that the 891-897 code does not look at the overrides.  I'm not sure 
if this is a bug or not, would take further investigation of the overrides.

If you are using a single input for both limit switches, then the motion
controller has no way of knowing which limit you have hit, and which
direction is safe to jog off the limits.

Do you have separate limit switches and separate inputs?  If so, it should
work.

If not, I'd suggest some HAL logic to let you push a button and block the
limit switch signal(s) before they enter the motion module.


On Tue, May 24, 2016, at 04:47 AM, andy pugh wrote:
> Should it be possible to jog off of a limit with an MPG?
> I have never managed to, and on my new lathe it takes a bit of
> dismantling to get to the screws to manually rotate the screw.
> 
> Of course, when the machine is properly set up, this should never happen.
> 
> -- 
> 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
> 
> --
> Mobile security can be enabling, not merely restricting. Employees who
> bring their own devices (BYOD) to work are irked by the imposition of MDM
> restrictions. Mobile Device Manager Plus allows you to control only the
> apps on BYO-devices by containerizing them, leaving personal data untouched!
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-- 
  John Kasunich
  jmkasun...@fastmail.fm

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Re: [Emc-developers] MPG Jogging Off of a Limit

[Thomas Powderly]

manual pulse generator
manuel puls geber ( i think the acronym was originally German )
an encoder used to jog
a handwheel/handrad

tomp
On 05/24/16 21:24, andy pugh wrote:
> On 24 May 2016 at 13:55, johnson  wrote:
>> We use ignore limits and we can jog off.
> With an MPG?
>


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Re: [Emc-developers] MPG Jogging Off of a Limit

[Thomas Powderly]

Sam
my old c-frame machines were all wired with an i/o box at rear of column
this box had 2 rows of terminal strips
top was in from control
bottom was out to control
terminal 1 of top jumpered to terminal 1 of bottom allowed override of 
the whole estop chain on machine side ( temperature, oil overflow, 
limts, etc )
I never went as far as installing an override switch though, thought 
that was risky
the jumper was useful when initally installing
( techs never set the tachos to agree with the motor command polarity )
tomp tjtr33


On 05/24/16 21:37, sam sokolik wrote:
> Wow - that is pretty..  Love the MPG's in the apron.   Can't wait for a
> video showing them working!
>
> The K is a pain to get off of the over travel limits - but it has only
> happened once when I forgot to home and jogged it into the limit.  The
> matsuura is even harder.  You would have to remove access panels to get
> the machine off the limits.  I was planning on just putting a switch -
> maybe momentary push button that disabled the over travel limits -
> allowing to jog off.  (we have done this already when I ran it into the
> over travel when homing wasn't quite right yet - we used a jumper.. :)
>
> sam
>
> On 5/24/2016 8:27 AM, andy pugh wrote:
>> On 24 May 2016 at 14:09, Gene Heskett  wrote:
>>> Double shaft motors would help. :-}
>> The motors have resolvers on the shaft extension, and then the whole
>> motor lives in a casting.
>>
>> No visible motor shafts in this set-up:
>> https://picasaweb.google.com/108164504656404380542/Holbrook#6281710819317309698
>>
>
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Re: [Emc-developers] MPG Jogging Off of a Limit

[sam sokolik]

Wow - that is pretty..  Love the MPG's in the apron.   Can't wait for a 
video showing them working!

The K is a pain to get off of the over travel limits - but it has only 
happened once when I forgot to home and jogged it into the limit.  The 
matsuura is even harder.  You would have to remove access panels to get 
the machine off the limits.  I was planning on just putting a switch - 
maybe momentary push button that disabled the over travel limits - 
allowing to jog off.  (we have done this already when I ran it into the 
over travel when homing wasn't quite right yet - we used a jumper.. :)

sam

On 5/24/2016 8:27 AM, andy pugh wrote:
> On 24 May 2016 at 14:09, Gene Heskett  wrote:
>> Double shaft motors would help. :-}
> The motors have resolvers on the shaft extension, and then the whole
> motor lives in a casting.
>
> No visible motor shafts in this set-up:
> https://picasaweb.google.com/108164504656404380542/Holbrook#6281710819317309698
>


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Re: [Emc-developers] MPG Jogging Off of a Limit

[andy pugh]

On 24 May 2016 at 13:55, johnson  wrote:
> We use ignore limits and we can jog off.

With an MPG?

-- 
atp
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-developers] MPG Jogging Off of a Limit

[andy pugh]

On 24 May 2016 at 14:09, Gene Heskett  wrote:
> Double shaft motors would help. :-}

The motors have resolvers on the shaft extension, and then the whole
motor lives in a casting.

No visible motor shafts in this set-up:
https://picasaweb.google.com/108164504656404380542/Holbrook#6281710819317309698

-- 
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-developers] MPG Jogging Off of a Limit

[Gene Heskett]

On Tuesday 24 May 2016 04:47:23 andy pugh wrote:

> Should it be possible to jog off of a limit with an MPG?
> I have never managed to, and on my new lathe it takes a bit of
> dismantling to get to the screws to manually rotate the screw.

Double shaft motors would help. :-}

When a (software) limit has been triggered, you are supposed see a 
checkbox on screen (using axis) that will let you jog off the limit. 
IIRC It has to be rechecked after the machine is re-enabled each time.  
One time deal, box and all disappears at the end of that one jog unless 
the triggering condition still exists.  Are you not getting that 
checkbox?

I'm not using an MPG, but I see no reason why it should not work like the 
keyb, ah, yes I do, the MPG may be outputting single step moves, 
different from the keyboards keydown/keyup status.  And a single step is 
quite likely an insufficient move to get off the limit, particularly if 
its a hardware switch.

OTOH, I have only a home switch, and limits are set from that in the .ini 
file.  Life is simpler that way (I think).

> Of course, when the machine is properly set up, this should never
> happen.

:)

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-developers] MPG Jogging Off of a Limit

[johnson]

We use ignore limits and we can jog off.


Jeff JohnsonSuperior Roll & Turning 


 Original message 
From: andy pugh  
Date: 5/24/16  4:47 AM  (GMT-05:00) 
To: EMC developers  
Subject: [Emc-developers] MPG Jogging Off of a Limit 

Should it be possible to jog off of a limit with an MPG?
I have never managed to, and on my new lathe it takes a bit of
dismantling to get to the screws to manually rotate the screw.

Of course, when the machine is properly set up, this should never happen.

-- 
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-developers] MPG Jogging Off of a Limit

[andy pugh]

Should it be possible to jog off of a limit with an MPG?
I have never managed to, and on my new lathe it takes a bit of
dismantling to get to the screws to manually rotate the screw.

Of course, when the machine is properly set up, this should never happen.

-- 
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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