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Messages - joeaverage

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1381
General Mach Discussion / Re: BOB relay low voltage
« on: August 08, 2020, 06:02:52 AM »
Hi,
sounds like the coil resistance of the relay is dragging the BoB output voltage down.
Why don't you use a transistor, diode and a resistor and then you could switch 24V and use
an industry standard relay coil voltage?

Craig

1382
Hi,
the ESS has 51 inputs and outputs, whereas the 57CNC has 57.

The ESS is TTL input/output, that is 5V. It is expected that the ESS be partnered with a breakout board and
the MB3 by CNCRoom is a nice example. It has a mix of differential, 24V single ended and opto-isolated inputs and
outputs with proper screw terminals. Using such a breakout board means you do not EVER direct connect to the ESS.
So whether inputs and/or outputs are TTL level, that is 5V, or 24V,  the industrial norm, depends on your choice of
breakout board not the ESS.

I've been using my ESS for six years and I've had one occasion, with several events over the course of an afternoon, where
I experienced electrical interference enough to stop the ESS. I was pushing my spindle to the very limits on that particular
job, but that is the only occasion that I've ever had a 'noise' problem.

I use a pair of MB2's from Homann Designs (not to be confused with the MB3 of CNCRoom, totally different animals) which
are single (parallel port equiv) port bi-directional TTL level breakout boards. You might argue that 5V signal levels are more noise
prone (than 24V), which is not in fact the case.....if....and ONLY IF....you choose the appropriate impedance level for your signaling circuit.
There is a rather complex (mathmatically)  reason why this is so, and I could refer you to various texts, F.G. Stremmler, 'Introduction to
Commuication Systems' (Addison-Wesley, 2nd ed.), the chapter (4) on power spectral density, and Ramo, Whinnery and VanDuzer, 'Fields and Waves
in Communication Electronics' (Wiley & Sons, 3rd ed.), the chapter (5) on circuit concepts and impedance in the presence of EM waves is fundamental
to the 'noise' question.

With appropriate impedance design a 5V system can have the same noise immunity as a 24V system (with the same signal power).

Craig

1383
Hi,
I don't know enough about PoKeys to be definitive, they are generally well spoken of.

The ESS is much faster, it is capable of pulse rates of 4Mhz, whereas 100kHz or maybe 125kHz from the PoKeys.
PoKeys on the other hand has analogue inputs, very handy if you need them. The ESS has realtime THC support,
whereas the PoKeys does not....so there are pluses and minuses with each choice, but both are good and well
supported.

Craig

1384
Hi,

Quote
I have an ESS on the Mach3 but at the time the ESS only supported one index for threading = has that changed?

Yes, the ESS now supports multiple pulses per rev up to some modest maximum,say 1000 ppr. It lacks the resolution that you would expect
for a motion controller closing the loop on position capable servos, but much enhanced over single ppr.

Also the ESS Mach4 plugin supports encoder feedback to spindle PWM, there again much lower bandwidth than you'd expect of a servo controller
but it is a closed loop velocity control none-the-less.

Craig

1385
Hi,
plasma all but requires THC to be effective, in fact the dynamic response of the THC control loop and the various anti-dive strategies
determine how good any given plasma table is.

Any Windows based CNC solution must be a buffered solution, as Windows cannot ever hope to be realtime, and therefore realtime THC must be enacted by
the motion controller, at considerable cost and complexity.

LinuxCNC however IS a realtime CNC solution and therefore can enact a highly dynamic THC control strategy without an expensive or
complex motion control and worthy of consideration if you are determined to have a plasma table.

Craig

1386
Hi,
notice that I used Windows 7 Embedded and embedded OS's have very VERY much longer life cycles than retail Windows 7.

Additionally with embedded OS's you get to chose the modules that you want and/or need and not even load the junk that you don't want.
You can get a working Windows 7 OS without all the frilly bits for under 0.5G. If you chose the 'compatability module selection option', namely
a very close equivalent to retail Windows 7 that runs in at about 1.8G. All 64 bit versions are larger again.

My version, that I've been running for five years, without any updates, is an intermediate selection of about 1.2G. It runs Mach4 just fine.....so I leave it
alone.

Craig

1387
Hi,
Windows 7 Embedded (standard) 32 bit.

Craig

1388
Hi,
I have a dual core Atom (with on chip graphics) running my machine in conjunction with an Ethernet SmoothStepper
and its run flawlessly for five years.

I don't know why Mach seems to consume that much CPU power, on my installation it seldom gets to 5% and I've never seen it go beyond 10%.

Craig

1389
Mach4 General Discussion / Re: Mach4 is already Running message
« on: August 03, 2020, 03:32:33 AM »
Hi,
I managed to crash Mach today.......I was running a probing routine with some dozens of probe points and recording the data to
a Probe Data file. I had a cock-up with the probe contact circuit and Mach aborted the rest of the routine with 'Probe Fault' but the
data file was still open, and I could not get Mach to respond to any keystrokes because the file was still open and recording.

In the event I had to shut down Mach and use the Task Manager to shut down Machs core. First time I've had to do that in months,
and I have been running probe routines like this daily for many moths now.

Craig

1390
Hi,
I think you are barking up the wrong tree.

You can indeed get Mach4 to read an input and then activate an output, but there is a delay and that delay will all but preclude you
from using this method for THC.

Firstly your controller will signal Mach4 every once and a while, an ESS for instance does so 40 times a second (every 25ms), and I presume your
PMDX controller will be similar. We will assume that the PC is ready and waiting, not altogether a correct assumption but not too bad,
and that it works out a response almost instantly. Then it will signal the controller but that signal will have to propagate through the
motion buffer, and the ESS (default) is 180ms. The PMDX will be about the same.

Ergo the LEAST delay will be 180ms and maybe longer depending on whether the PC is ready or not and the signaling delay to the PC,
up to 25ms, say.

Such a slow control loop will all but stop you from THC but may be adequate for very long time constant processes like temperature control.

There is some good news however.

Firstly there are two Mach4 controllers which are realtime THC capable, namely the Hicon by Vital Systems and the ESS by Warp9TD.

Secondly, and probably more appealing to you by virtue of not having to buy another controller, is the (relatively) new script base THC feature.
All you need is a THC sensor/decision making unit (the decison is UP or DOWN) like a Proma THC unit and hook that to Mach and allows Machs
script to do the hard work for you.

As a side note the control bandwidth of the script based THC feature is  still a lot slower (10-20Hz) than a genuine realtime controller (100Hz plus)
but not too shabby!

Craig

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