[Emc-users] G64 - view current setting

[David Berndt]

Is there any way to See the P or P and Q values of G64? A pin or param  
somewhere? Some other method?


-Dave


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Re: [Emc-users] Probe with PCB piece

[Gene Heskett]

On Monday 16 November 2020 15:37:08 Alan Condit wrote:

> Hi,
>
> I want to set up to probe for workpiece height (tool length) with a
> piece of PCB  and a wire hooked to probe input and another piece of
> wire and an alligator clip wired to probe ground.  I would clip the
> alligator clamp to the tool and set the piece of PCB on top of the
> work surface. So, the circuit would close when the tool tip touched
> the PCB. However, when I read the instructions on G38.2 it talks about
> the switch opening. Can I invert the probe signal and use it for
> switch closing?
>
> Thanks,
> Alan
>
Yes, been doing exactly that for years Alan. If using a mesa interface, 
you may be able to "net" it to the in-not pin and skip the invertor as 
its one less thing to worry about in your addf order.
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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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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[Emc-users] Probe with PCB piece

[Alan Condit]

Hi,

I want to set up to probe for workpiece height (tool length) with a piece of 
PCB  and a wire hooked to probe input and another piece of wire and an 
alligator clip wired to probe ground.  I would clip the alligator clamp to the 
tool and set the piece of PCB on top of the work surface. So, the circuit would 
close when the tool tip touched the PCB. However, when I read the instructions 
on G38.2 it talks about the switch opening. Can I invert the probe signal and 
use it for switch closing? 

Thanks,
Alan

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[Emc-users] wj200_vfd component

[Karl Schmidt]

I just fixed a minor thing in this component - but I'm thinking of adding a 
bit, so I'm wondering if anyone here is using it?

It already has a commanded-frequency input, I was thinking of adding a rpm 
input and a scale input based on how others were
setting it up in hal ( loading a mult2 to do this job ).

So what I would add is:

 if scale is 0 (or not set) - it just works as it is. But if scale is set, it 
would ignore the frequency pin and calculate
a frequency from scale * rpm

I looked at the code for the other VFDs components - they vary a bit - some use 
frequency - some rpm inputs


--

Karl Schmidt  EMail k...@lrak.net
3209 West 9th Street Ph (785) 979-8397
Lawrence, KS 66049


Experience is something you never get,
until just after you needed it.



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Re: [Emc-users] linuxcnc board with good epp port

[andy pugh]

On Sun, 15 Nov 2020 at 22:50, dave engvall  wrote:
>
> With *B*lack Friday on/coming I need a recommendation for a motherboard
> that has good latency and a rock solid EPP port.

I have never tried it, but if I was buying I think I would get this one:
https://www.mini-itx.com/~JNF791-3855

12V input and Parallel port.

I am using the JNF9C in my lathe with no problems but I think that is
out of production.



--
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] linuxcnc board with good epp port

[dave engvall]

Thanks Jon. Appreciate the help.
Dave

On 11/15/20 3:29 PM, Jon Elson wrote:

On 11/15/2020 04:48 PM, dave engvall wrote:

HI,
With *B*lack Friday on/coming I need a recommendation for a 
motherboard that has good latency and a rock solid EPP port. Servo 
application so that should relieve some of the constraints. It needs 
to work with Jon's upwm  and Peter's 7i34. Naturally it also needs to 
be currently available. Any help would be massively appreciated. I'm 
getting too old to fight iffy hardware.
My go-to is some of the older Dell Optiplex machines.  You can get 
these on eBay for $70 delivered with a little patience.  Avoid any 
with the i810 graphics, it causes crashes and hangups.  You would need 
a PCI plug-in graphics card to override that.


Anything up to the Optiplex 980 is fine, after that they dropped the 
built-in parallel port.


For machines with PCIe, I get the Syba SD-PEX10005 card.

Jon


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Re: [Emc-users] Poor memory, or new feature?

[Gene Heskett]

On Monday 16 November 2020 04:12:02 andrew beck wrote:

> Sweet.  I have 8 big servo drives for all my machines turning up
> tomorrow I think finally.  Will be so good to get my cnc lathe and
> second cnc mill working.
>
But Andrew, that will generate a lot of 4 letter words, called "work". At 
my age, I ration that to what I can do with a 30% pump.

Unless it was originally built with motors. adapting it for servo motors 
will be a lot of work. I think the most work I did was on the Sheldon 
lathe, it was in bad shape, compound broken, spindle bent, crossfeed in 
tatters. I had to strip it down to the bed and build it back up with new 
designs at every aspect.  Finding the right ball screws was just a 
start. The only thing left of the original X drive today is the crank 
bearing screwed into the front of the carriage.  And its been machined 
to be the new X anchor point complete with roller bearings in both 
directions. None of the taper attachment that was the original X anchor 
is still on the machine. I sealed up the trench in the cross feed where 
the screw lives so swarf can't get into the new ball screw, and I 
covered the new ball type Z screw with pleated bellows to keep swarf out 
of it.

I used some motors I had on the shelf which weren't that well suited for 
the job, and just this summer replaced both of them with the new 2 and 3 
newton, 3 phase steppers that think they are servo's, reducing the 
stepper rattle about 99%, its now Casper the ghost when moving at 
cutting speeds, those 3 phase motors are very low noise. The drivers are 
MUCH smaller.

And alarmed. I can run z into a stopped chuck jaw with a chipped tool 
mounted at 5 ipm, it see's the stoppage, kills the motor enables which 
allows them to spring back to clear the chuck jaw about 10 thou, and 
cancels all homes. And does it w/o crushing the $15 chip in the tool. I 
made clamps for the rear of the faceplates that clamp the backing plate 
to the spindle flange, and put a retuned vfd on the spindle motor.

I've made some hal code show how far it turns at overtravel, and If I do 
the gcode right, calculates the overtravel distance when motion issues a 
reverse when doing rigid tapping. With an 8" 4 jaw chuck mounted, a good 
35 lbs, and turning 100 rpm, the overtravel is .245 turn.

I made a new apron plate, and it has a pair of 100 ppr dials, that I can 
drive by hand since there are not any hand cranks left, at selectable 
speeds starting at .0002" per click. 

LinuxCNC lets me correct for bed wear, which is considerable right in 
front of the chuck, so I can run it from the chuck to the tail stock at 
a maximum uncorrected error in the .002" range.  The great unknown is 
the error in the 1.5 meter long, grade C7 Z screw. The X screw is a bit 
better, but its history is unk. Backlash is in the range of 1 to 2 thou, 
both ways. Pretty good for a nearly 80 yo lathe

That's good enough for the girls I go with these days. :)

> So I'll be asking a lot of questions about linuxcnc again soon I
> think.

Bring `em on. I've not quite done it yet, but I'll learn about servo's 
since that is what I am hanging on the side of a Chinese BS-1 clone to 
run it. Using a brushed 100 watt sliding estate gate motor, which has an 
encoder in it and is a worm drive output.

> Regards
>
> Andrew

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)
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] Poor memory, or new feature?

[andrew beck]

Sweet.  I have 8 big servo drives for all my machines turning up tomorrow I
think finally.  Will be so good to get my cnc lathe and second cnc mill
working.

So I'll be asking a lot of questions about linuxcnc again soon I think.

Regards

Andrew

On Mon, Nov 16, 2020, 7:49 PM Gene Heskett  wrote:

> On Monday 16 November 2020 01:06:54 andrew beck wrote:
>
> > Not sure.  I can check later
> >
> Never mind, Andrew, I can test later today.  Thanks for the reminder.
>
> 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)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
>
>
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