Re: [Emc-users] Plasma Mistake

[Gregg Eshelman]

It would be easier to put a large sign below the control computer's screen, and 
signs on/around the table. CHECK GROUND CLAMP!

 
  From: Jim Craig 
 To: Enhanced Machine Controller (EMC)  
 Sent: Thursday, May 19, 2016 10:26 AM
 Subject: Re: [Emc-users] Plasma Mistake
   
I think in addition to the message box in the g-code file I will add a 
HAL message component that will trigger off a one shot component that is 
connected to the machine on state. This way each time the machine is 
turned on the pop up message will show up to remind the user to connect 
the ground. (just in case as I am a forgetful dummy).
   
 
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Re: [Emc-users] Plasma Mistake

[Gene Heskett]

On Thursday 19 May 2016 12:26:53 Jim Craig wrote:

> I think in addition to the message box in the g-code file I will add a
> HAL message component that will trigger off a one shot component that
> is connected to the machine on state. This way each time the machine
> is turned on the pop up message will show up to remind the user to
> connect the ground. (just in case as I am a forgetful dummy).
>
> On 5/19/2016 10:57 AM, Dave Cole wrote:
> > Also, you will find out that how you put the clamp on the table will
> > affect the plasma flame "direction".   The plasma flame will point
> > somewhat in the direction of the best ground.
> > If you clip it on one leg and the other legs and supports are not
> > well connected you will see the effects of the poor ground path in
> > your cuts.  The way you ground a plasma table is really important.
> >
> > Dave
>
> The ground is normally placed on the grid in the water table. This
> gets the ground as close to the part as possible and creating a
> distributed ground grid under the plate being cut. What is the
> suggested best method to ground the table to the plasma cutter to
> prevent the directional arcing?
>
> Thanks,
>
> Jim

This is a bit of a puzzle.  First, connecting to the support grid is 
guaranteed to be a poor ground, as that will have to spot weld itself at 
someplace where the work is laying on the grid.  With the oxide coatings 
present on 99% of the metal that goes under the torch, its going to be a 
hit & occasionally miss problem.

Connecting the end of the star to the grid is OK, but from the grid to 
workpiece, I think I'd go get 4 small c-clamps, weld or bolt a 9 or 10" 
ground cable to them, bolting the cable to a handy place on the grid so 
that you can pick the clamps up and put one at each corner of the 
workpiece.  Screwed to about 1/4 turn from broke, that should give you a 
good, very low ohms ground.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Plasma Mistake

[Jim Craig]

I think in addition to the message box in the g-code file I will add a 
HAL message component that will trigger off a one shot component that is 
connected to the machine on state. This way each time the machine is 
turned on the pop up message will show up to remind the user to connect 
the ground. (just in case as I am a forgetful dummy).

On 5/19/2016 10:57 AM, Dave Cole wrote:
> Also, you will find out that how you put the clamp on the table will
> affect the plasma flame "direction".   The plasma flame will point
> somewhat in the direction of the best ground.
> If you clip it on one leg and the other legs and supports are not well
> connected you will see the effects of the poor ground path in your
> cuts.  The way you ground a plasma table is really important.
>
> Dave
>
The ground is normally placed on the grid in the water table. This gets 
the ground as close to the part as possible and creating a distributed 
ground grid under the plate being cut. What is the suggested best method 
to ground the table to the plasma cutter to prevent the directional arcing?

Thanks,

Jim

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Re: [Emc-users] Plasma Mistake

[Dave Cole]

If you want to keep using the ground clamp as is I'd order two sets 
of parts from John...  :-)  You won't need them next week or two weeks 
from now..   Just as soon as the memory of this fades a bit.

Also, you will find out that how you put the clamp on the table will 
affect the plasma flame "direction".   The plasma flame will point 
somewhat in the direction of the best ground.
If you clip it on one leg and the other legs and supports are not well 
connected you will see the effects of the poor ground path in your 
cuts.  The way you ground a plasma table is really important.

Dave

On 5/19/2016 11:35 AM, Jon Elson wrote:
> On 05/19/2016 08:13 AM, Jim Craig wrote:
>> Don't ever forget to hook up the ground to the plasma cutter!
>>
>>
> One suggestion is to run an EXTRA ground cable from the
> plasma power supply to the machine table.  Not the base of
> the frame, but the actual table the work sits on, if that
> moves.  This would prevent most of the damage if you ever
> forget again (probably won't happen for a long while!)
>
> Jon
>
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Re: [Emc-users] Plasma Mistake

[Jon Elson]

On 05/19/2016 08:13 AM, Jim Craig wrote:
>
> Don't ever forget to hook up the ground to the plasma cutter!
>
>
One suggestion is to run an EXTRA ground cable from the 
plasma power supply to the machine table.  Not the base of 
the frame, but the actual table the work sits on, if that 
moves.  This would prevent most of the damage if you ever 
forget again (probably won't happen for a long while!)

Jon

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Re: [Emc-users] Plasma Mistake

[andy pugh]

On 19 May 2016 at 10:16, Jim Craig  wrote:
> In this situation the plasma cutter unit is used on the CNC machine as
> well as as a manual hand cutter. So the clamp remains to be universal.

Put a permanent bolt-on lug in the _middle_ of the ground lead then.

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Re: [Emc-users] Plasma Mistake

[Jim Craig]

John,

In this situation the plasma cutter unit is used on the CNC machine as 
well as as a manual hand cutter. So the clamp remains to be universal. 
It is trivial to switch between use on the CNC table or as a manual hand 
cutter, as long as you don't forget the ground clamp.

Jim


On 5/19/2016 9:02 AM, John Kasunich wrote:
> One question:  Why do you have a ground "clamp".
>
> A CNC plasma is a more-or-less permanent installation.  Put a lug on that
> ground cable and bolt it to the machine table/frame.
>
>


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Re: [Emc-users] Plasma Mistake --> Ground

[Nicklas Karlsson]

To get a working usually involve exploring there others.

If ground clamp of plasma cutter must be checked every time problems could be 
expected every now and then. It is possible to mitigate with proper procedures 
as is done for air safety and it work most of the time although it cost money. 
They got it to work with nitroglycerin once upon a time but dynamite is 
preferred. It will probably be hard to get procedure compliance then there are 
no real danger.


On Thu, 19 May 2016 08:13:32 -0500
Jim Craig  wrote:

> So my goal is to let others learn from my mistakes. So in that way I 
> tend to make a lot of them so everyone can benefit. Last night I was 
> working with the plasma machine and made a big one!
> 
> Don't ever forget to hook up the ground to the plasma cutter!
> 
> When we hit the go button the program started. The torch found the 
> material. The pilot arc started and BAM everything stopped. Realtime 
> error in LinuxCNC. Cleared repowered the machine and nothing would still 
> work. That is when I realized the ground clamp was not on the cutting 
> table.
> 
> It took out the two breakout boards and the mesa THCAD-10 board. 
> Everything else seems to have survived. I replaced one of the breakout 
> boards to see what all was damaged. The parallel ports are still working 
> and the stepper drives are still working so the damage was limited.
> 
> So this serves as a warning to anyone that is using a plasma CNC machine.
> 
> My next question is what can I do in LinuxCNC to get a message box each 
> time a program is being started to check the plasma ground. This will 
> help to mitigate this problem in the future.
> 
> If there is no way to do it in LinuxCNC then I will add a piece of code 
> to the post processor we use in Fusion360 to add the message and a 
> program pause in the initial preamble of the file.
> 
> John T., I ordered a replacement THCAD-10 this morning. I just want to 
> thank you for the simple privacy statement on your website. I think you 
> should change your terms to be "You pay me, I ship you stuff!"
> 
> Thanks and be warned!
> 
> Jim C.
> 
> 
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Re: [Emc-users] Plasma Mistake

[John Kasunich]

On Thu, May 19, 2016, at 09:13 AM, Jim Craig wrote:
> So my goal is to let others learn from my mistakes. So in that way I 
> tend to make a lot of them so everyone can benefit. Last night I was 
> working with the plasma machine and made a big one!
> 
> Don't ever forget to hook up the ground to the plasma cutter!
> 
> When we hit the go button the program started. The torch found the 
> material. The pilot arc started and BAM everything stopped. Realtime 
> error in LinuxCNC. Cleared repowered the machine and nothing would still 
> work. That is when I realized the ground clamp was not on the cutting 
> table.

One question:  Why do you have a ground "clamp".

A CNC plasma is a more-or-less permanent installation.  Put a lug on that
ground cable and bolt it to the machine table/frame.


-- 
  John Kasunich
  jmkasun...@fastmail.fm

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Re: [Emc-users] Plasma Mistake

[Jim Craig]

Les,

Thanks for the info. We were rethinking the machine grounding last 
night. We will look into it further when we are putting it back together.

Thanks again,

Jim

On 5/19/2016 8:28 AM, Les Newell wrote:
> Hi Jim,
>
> There are a few precautions you can take so forgetting to clamp the
> ground doesn't destroy your electronics. First use a star ground. Weld a
> bolt to the frame of your machine and connect that to your supply mains
> earth. Now make sure the mains earth for your computer and plasma cutter
> also connect to the same point. You don't want any loops, just direct
> connections straight to this single point.
>
> Second make sure none of your electronics have any connection to the
> frame of the machine. Cable screens etc should be isolated from the
> frame. The only connection should be that star point earth.
>
> Les
>
> On 19/05/2016 14:13, Jim Craig wrote:
>> So my goal is to let others learn from my mistakes. So in that way I
>> tend to make a lot of them so everyone can benefit. Last night I was
>> working with the plasma machine and made a big one!
>>
>> Don't ever forget to hook up the ground to the plasma cutter!
>>
>> When we hit the go button the program started. The torch found the
>> material. The pilot arc started and BAM everything stopped. Realtime
>> error in LinuxCNC. Cleared repowered the machine and nothing would still
>> work. That is when I realized the ground clamp was not on the cutting
>> table.
>>
>> It took out the two breakout boards and the mesa THCAD-10 board.
>> Everything else seems to have survived. I replaced one of the breakout
>> boards to see what all was damaged. The parallel ports are still working
>> and the stepper drives are still working so the damage was limited.
>>
>> So this serves as a warning to anyone that is using a plasma CNC machine.
>>
>> My next question is what can I do in LinuxCNC to get a message box each
>> time a program is being started to check the plasma ground. This will
>> help to mitigate this problem in the future.
>>
>> If there is no way to do it in LinuxCNC then I will add a piece of code
>> to the post processor we use in Fusion360 to add the message and a
>> program pause in the initial preamble of the file.
>>
>> John T., I ordered a replacement THCAD-10 this morning. I just want to
>> thank you for the simple privacy statement on your website. I think you
>> should change your terms to be "You pay me, I ship you stuff!"
>>
>> Thanks and be warned!
>>
>> Jim C.
>>
>
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>


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Re: [Emc-users] Plasma Mistake

[Les Newell]

Hi Jim,

There are a few precautions you can take so forgetting to clamp the 
ground doesn't destroy your electronics. First use a star ground. Weld a 
bolt to the frame of your machine and connect that to your supply mains 
earth. Now make sure the mains earth for your computer and plasma cutter 
also connect to the same point. You don't want any loops, just direct 
connections straight to this single point.

Second make sure none of your electronics have any connection to the 
frame of the machine. Cable screens etc should be isolated from the 
frame. The only connection should be that star point earth.

Les

On 19/05/2016 14:13, Jim Craig wrote:
> So my goal is to let others learn from my mistakes. So in that way I
> tend to make a lot of them so everyone can benefit. Last night I was
> working with the plasma machine and made a big one!
>
> Don't ever forget to hook up the ground to the plasma cutter!
>
> When we hit the go button the program started. The torch found the
> material. The pilot arc started and BAM everything stopped. Realtime
> error in LinuxCNC. Cleared repowered the machine and nothing would still
> work. That is when I realized the ground clamp was not on the cutting
> table.
>
> It took out the two breakout boards and the mesa THCAD-10 board.
> Everything else seems to have survived. I replaced one of the breakout
> boards to see what all was damaged. The parallel ports are still working
> and the stepper drives are still working so the damage was limited.
>
> So this serves as a warning to anyone that is using a plasma CNC machine.
>
> My next question is what can I do in LinuxCNC to get a message box each
> time a program is being started to check the plasma ground. This will
> help to mitigate this problem in the future.
>
> If there is no way to do it in LinuxCNC then I will add a piece of code
> to the post processor we use in Fusion360 to add the message and a
> program pause in the initial preamble of the file.
>
> John T., I ordered a replacement THCAD-10 this morning. I just want to
> thank you for the simple privacy statement on your website. I think you
> should change your terms to be "You pay me, I ship you stuff!"
>
> Thanks and be warned!
>
> Jim C.
>


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Re: [Emc-users] Plasma Mistake

[Jim Craig]

I think I will use the following:

(msg, HEY STUPID IDIOT, CHECK GROUND CLAMP!!!)
M0

Thanks John,

Jim

On 5/19/2016 8:35 AM, John Thornton wrote:
> Thanks, in your G code put:
>
> (msg, CHECK GROUND CLAMP)
> M0
>
> JT
>
>
> On 5/19/2016 8:13 AM, Jim Craig wrote:
>> So my goal is to let others learn from my mistakes. So in that way I
>> tend to make a lot of them so everyone can benefit. Last night I was
>> working with the plasma machine and made a big one!
>>
>> Don't ever forget to hook up the ground to the plasma cutter!
>>
>> When we hit the go button the program started. The torch found the
>> material. The pilot arc started and BAM everything stopped. Realtime
>> error in LinuxCNC. Cleared repowered the machine and nothing would still
>> work. That is when I realized the ground clamp was not on the cutting
>> table.
>>
>> It took out the two breakout boards and the mesa THCAD-10 board.
>> Everything else seems to have survived. I replaced one of the breakout
>> boards to see what all was damaged. The parallel ports are still working
>> and the stepper drives are still working so the damage was limited.
>>
>> So this serves as a warning to anyone that is using a plasma CNC machine.
>>
>> My next question is what can I do in LinuxCNC to get a message box each
>> time a program is being started to check the plasma ground. This will
>> help to mitigate this problem in the future.
>>
>> If there is no way to do it in LinuxCNC then I will add a piece of code
>> to the post processor we use in Fusion360 to add the message and a
>> program pause in the initial preamble of the file.
>>
>> John T., I ordered a replacement THCAD-10 this morning. I just want to
>> thank you for the simple privacy statement on your website. I think you
>> should change your terms to be "You pay me, I ship you stuff!"
>>
>> Thanks and be warned!
>>
>> Jim C.
>>
>>
>> --
>> 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!
>> https://ad.doubleclick.net/ddm/clk/304595813;131938128;j
>> ___
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>
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Re: [Emc-users] Plasma Mistake

[John Thornton]

Thanks, in your G code put:

(msg, CHECK GROUND CLAMP)
M0

JT


On 5/19/2016 8:13 AM, Jim Craig wrote:
> So my goal is to let others learn from my mistakes. So in that way I
> tend to make a lot of them so everyone can benefit. Last night I was
> working with the plasma machine and made a big one!
>
> Don't ever forget to hook up the ground to the plasma cutter!
>
> When we hit the go button the program started. The torch found the
> material. The pilot arc started and BAM everything stopped. Realtime
> error in LinuxCNC. Cleared repowered the machine and nothing would still
> work. That is when I realized the ground clamp was not on the cutting
> table.
>
> It took out the two breakout boards and the mesa THCAD-10 board.
> Everything else seems to have survived. I replaced one of the breakout
> boards to see what all was damaged. The parallel ports are still working
> and the stepper drives are still working so the damage was limited.
>
> So this serves as a warning to anyone that is using a plasma CNC machine.
>
> My next question is what can I do in LinuxCNC to get a message box each
> time a program is being started to check the plasma ground. This will
> help to mitigate this problem in the future.
>
> If there is no way to do it in LinuxCNC then I will add a piece of code
> to the post processor we use in Fusion360 to add the message and a
> program pause in the initial preamble of the file.
>
> John T., I ordered a replacement THCAD-10 this morning. I just want to
> thank you for the simple privacy statement on your website. I think you
> should change your terms to be "You pay me, I ship you stuff!"
>
> Thanks and be warned!
>
> Jim C.
>
>
> --
> 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!
> https://ad.doubleclick.net/ddm/clk/304595813;131938128;j
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Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle, frequency, etc, ) from GUI ?

[andy pugh]

On 19 May 2016 at 09:14, adit bhargava  wrote:

> I am still able to read the actual output pin hm2_5i25.0.gpio.23.out without
> adding the read_gpio function.

No, that reads the value that HAL is sending to the pin.

I think that pin hm2_5i25.0.gpio.23.in will tell you the actual value
on the pin, and you should be able to tell if there is any
discrepancy.

-- 
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"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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Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle, frequency, etc, ) from GUI ?

[adit bhargava]

Andy, 

I am still able to read the actual output pin hm2_5i25.0.gpio.23.out without 
adding the read_gpio function.
And it is showing correct values on HALSCOPE
BRAdit

  From: andy pugh 
 To: adit bhargava  
Cc: Enhanced Machine Controller (EMC) 
 Sent: Thursday, May 19, 2016 2:59 PM
 Subject: Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle, 
frequency, etc, ) from GUI ?
   
On 19 May 2016 at 08:02, adit bhargava  wrote:
> Yes, a real Cathode ray oscilloscope.(CRO)

I would normally trust that more than Halscope.

Note that Halscope only plots the internal values, it isn't looking at
the output pins.
I think that if you add the hm2_5i25.0.read_gpio function to the base
thread you should be able to read the actual output pin values (I
think that Mesa GPIO outputs are readable as inputs).

-- 
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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[Emc-users] Plasma Mistake

[Jim Craig]

So my goal is to let others learn from my mistakes. So in that way I 
tend to make a lot of them so everyone can benefit. Last night I was 
working with the plasma machine and made a big one!

Don't ever forget to hook up the ground to the plasma cutter!

When we hit the go button the program started. The torch found the 
material. The pilot arc started and BAM everything stopped. Realtime 
error in LinuxCNC. Cleared repowered the machine and nothing would still 
work. That is when I realized the ground clamp was not on the cutting 
table.

It took out the two breakout boards and the mesa THCAD-10 board. 
Everything else seems to have survived. I replaced one of the breakout 
boards to see what all was damaged. The parallel ports are still working 
and the stepper drives are still working so the damage was limited.

So this serves as a warning to anyone that is using a plasma CNC machine.

My next question is what can I do in LinuxCNC to get a message box each 
time a program is being started to check the plasma ground. This will 
help to mitigate this problem in the future.

If there is no way to do it in LinuxCNC then I will add a piece of code 
to the post processor we use in Fusion360 to add the message and a 
program pause in the initial preamble of the file.

John T., I ordered a replacement THCAD-10 this morning. I just want to 
thank you for the simple privacy statement on your website. I think you 
should change your terms to be "You pay me, I ship you stuff!"

Thanks and be warned!

Jim C.


--
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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Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle, frequency, etc, ) from GUI ?

[andy pugh]

On 19 May 2016 at 08:02, adit bhargava  wrote:
> Yes, a real Cathode ray oscilloscope.(CRO)

I would normally trust that more than Halscope.

Note that Halscope only plots the internal values, it isn't looking at
the output pins.
I think that if you add the hm2_5i25.0.read_gpio function to the base
thread you should be able to read the actual output pin values (I
think that Mesa GPIO outputs are readable as inputs).

-- 
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!
https://ad.doubleclick.net/ddm/clk/304595813;131938128;j
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Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle, frequency, etc, ) from GUI ?

[adit bhargava]

Yes, a real Cathode ray oscilloscope.(CRO)


  From: andy pugh 
 To: adit bhargava  
Cc: Enhanced Machine Controller (EMC) 
 Sent: Thursday, May 19, 2016 1:54 PM
 Subject: Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle, 
frequency, etc, ) from GUI ?
   
On 19 May 2016 at 05:40, adit bhargava  wrote:
> I am also surprised because HALSCOPE shows the correct period values with
> T-ON = 2ms for every frequency( 100HZ-150Hz ) but the oscilloscope shows
> only for 100 Hz and 150 Hz.

Is it a "real" oscilloscope?

-- 
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!
https://ad.doubleclick.net/ddm/clk/304595813;131938128;j
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Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle, frequency, etc, ) from GUI ?

[andy pugh]

On 19 May 2016 at 05:40, adit bhargava  wrote:
> I am also surprised because HALSCOPE shows the correct period values with
> T-ON = 2ms for every frequency( 100HZ-150Hz ) but the oscilloscope shows
> only for 100 Hz and 150 Hz.

Is it a "real" oscilloscope?

-- 
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!
https://ad.doubleclick.net/ddm/clk/304595813;131938128;j
___
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Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle, frequency, etc, ) from GUI ?

[adit bhargava]

Andy,
I don't understand the reason as if why I am getting correct period values on 
HALSCOPE but not on Oscilloscope.This seems that pwmgen source code is 
outputting correct values for different frequencies.
BRAdit


  From: adit bhargava 
 To: andy pugh  
Cc: Enhanced Machine Controller (EMC) 
 Sent: Thursday, May 19, 2016 11:40 AM
 Subject: Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle, 
frequency, etc, ) from GUI ?
   
Hi Andy,
I am also surprised because HALSCOPE shows the correct period values with T-ON 
= 2ms for every frequency( 100HZ-150Hz ) but the oscilloscope shows only for 
100 Hz and 150 Hz.
BRAdit

  From: andy pugh 
 To: adit bhargava  
Cc: Enhanced Machine Controller (EMC) 
 Sent: Wednesday, May 18, 2016 7:14 PM
 Subject: Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle, 
frequency, etc, ) from GUI ?
  
On 18 May 2016 at 10:10, adit bhargava  wrote:
.
> Please suggest me an example how to generate pulses with T-On = 2ms and
> T-off = 4.7 ms (as an example)

You can't define T-on, T-off _and_ frequency at the same time. Each is
a consequence of the two others.

> Is it suitable for variable frequencies(changing frequencies at run time )
> and variable duty cycle?

If you really do need to change duty-cycle _and_ frequency then PWMgen
probably is the way to do it.

Normally PWM uses fixed frequency and variable duty cycle.
Normally Stepgen uses fixed pulse length and variable frequency.

Both allow you to change the other parameters, but they are not
necessarily coded with the assumption that that is what will happen.

You might have to look at the code and see if you can see a reason
that PWMgen won't give you the frequency resolution you need. You
results surprise me.

-- 
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!
https://ad.doubleclick.net/ddm/clk/304595813;131938128;j
___
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Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle, frequency, etc, ) from GUI ?

[adit bhargava]

Hi Andy,
I am also surprised because HALSCOPE shows the correct period values with T-ON 
= 2ms for every frequency( 100HZ-150Hz ) but the oscilloscope shows only for 
100 Hz and 150 Hz.
BRAdit

  From: andy pugh 
 To: adit bhargava  
Cc: Enhanced Machine Controller (EMC) 
 Sent: Wednesday, May 18, 2016 7:14 PM
 Subject: Re: [Emc-users] How to assign values to pwmgen parameters(duty-cycle, 
frequency, etc, ) from GUI ?
   
On 18 May 2016 at 10:10, adit bhargava  wrote:
.
> Please suggest me an example how to generate pulses with T-On = 2ms and
> T-off = 4.7 ms (as an example)

You can't define T-on, T-off _and_ frequency at the same time. Each is
a consequence of the two others.

> Is it suitable for variable frequencies(changing frequencies at run time )
> and variable duty cycle?

If you really do need to change duty-cycle _and_ frequency then PWMgen
probably is the way to do it.

Normally PWM uses fixed frequency and variable duty cycle.
Normally Stepgen uses fixed pulse length and variable frequency.

Both allow you to change the other parameters, but they are not
necessarily coded with the assumption that that is what will happen.

You might have to look at the code and see if you can see a reason
that PWMgen won't give you the frequency resolution you need. You
results surprise me.

-- 
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!
https://ad.doubleclick.net/ddm/clk/304595813;131938128;j
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Re: [Emc-users] Linuxcnc and Arduino

[Erik Christiansen]

On 18.05.16 08:30, Chris Albertson wrote:
> This is a general problem that applies not just to CNC machines.  What
> to do if the human interface allows a human to tell a machine to do
> something it can't do?In this case the interface allows you to
> command the axis to move faster then it can.  The best design is to
> prevent this.  You'd need to have some kind of force feedback, a
> torque or brake applied to the command wheel to prevent you from
> turning it to fast.  Cheaper solution is a big red LED that lights up
> as you approach 90% of the maximum speed.  Or in place of the LED a
> vibrator motor to shake the wheel.

I like the big red LED, especially together with a little mobile phone
vibrator motor or a complaining squawker, but what about just limiting
the joystick/knob output to MAX_VEL? Within LinuxCNC that ought to be
possible, maybe using a hal limit component? If it had to be done in the
arduino, then the limit would also not need to be hard-coded into the
program if means to increase/decrease the value via the user interface
were provided, as the result could then instead be saved in on-chip EEPROM.

The latter method would permit scaling of the joystick travel to match
MAX_VEL, whereas the former would result in the last bit of joystick
travel doing nothing, which is suboptimal.

If an operator is likely to jerk the joystick instantly to full travel,
then it might be an idea to limit output to e.g. 95% of MAX_VEL, so that
LinuxCNC can catch up despite limited MAX_ACCEL.

Erik

--
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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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