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Messages - joeaverage

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271
Mach4 General Discussion / Re: Debounce in Mach4?
« on: February 06, 2023, 02:08:59 PM »
Hi,
the ESS allows you to place filtering on each pin, it is the programmatic equivalent of a low pass filter. Each pin can have its own time constant.

If the UC400 does not have the same thing then add a low pass filter to each input for which it is required, a resistor and a capacitor, hardly rocket science.

Craig

272
Hi,
you may need to study up some Gcode.

G1 XnnnYmmm Fppp means travel linearly from the current X,Y location to (nnn,mmm)  at a feed rate of ppp units/min.
The speed is included in the Gcode.

Craig

273
Mach4 General Discussion / Re: Debounce in Mach4?
« on: February 04, 2023, 10:54:18 PM »
Hi,
de-bounce or noise filtering is property of the motion controller not Mach4. You need to look at the pin assignments of the UC400.

I use an ESS and the de-bounce is part of the ESS plugin PinConfig tab.

Craig

274
Hi,
I would be happy enough to use an optical switch for a Limit switch but would not use one for a Home switch.

Of course an optical switch used for any purpose is subject to chips or coolant getting in there and obstructing the phototransistor.
I would presume that anyone using such a device has already thought that through  and judged it not limiting.

Limit switches are obviously mounted at the end of travel and a little inaccuracy, say 0.5mm either way in it's detection point
would be fine, and therefore I would regard opto-siwtches as perfectly adequate, with the proviso above.

A Home switch is all about repeatability and for that purpose I would not use an opto-switch.

As you know Mach when homing travels toward a Home switch and on detection of a switch activation, decelerates to a stop, and then
backs up until the switch de-activates whereon it References the axis. The repeatability then depends very much on the hysteresis of the switch,
that is to say the difference (in distance) between when the switch activates and when it backs up and de-activates.

An opto-switch activates as the interrupt blade advances and partially obscures the light beam entering the phototransistor. Let's assume the
activation occurs at 50% obscuration. Now when the axis reverses when does the switch de-activate...at the same 50%, or more, or less?.
The specifications of opto-switches do not include any hysteresis measurement.

I like Omron (or equivalent from other manufacturers) roller plunger snap action microswitches. They have a well-defined and thereby repeatable switch
activation point and more importantly a defined and repeatable de-activation point and the associated hysteresis, 0.05mm. I have used these as Home switches
on my first mini-mill and more recently both as Limit and Home switches on my new mill. I regularly get better than 0.02mm repeatability without
recourse to Index Homing.

https://nz.element14.com/omron-industrial-automation/z-15gq22-b/micro-sw-roller-plunger-spdt-15a/dp/1500340?st=snap%20action%20microswitch

Craig

275
Hi,
according to the data sheet that is a 5VDC device with an absolute max of 10VDC. If you've applied 12V its probably toast.

Craig

276
Mach4 General Discussion / Re: adding a simple relay
« on: February 01, 2023, 10:52:41 PM »
Hi,
this post should be on the Mach4 General Discussion Board and I would guess Tweakie will shift it there in due course.

Mach has quite a range of output signals, and while defined and usually behave in certain sensible ways they don't actually do anything until
or unless you logically connect that signal to a device.

In this case I would suggest you use mc.OSIG_COOLANT_ON. Naturally you don't have coolant but often Gcode will include an m8 which turns the coolant
ON and consequently Mach's mc.OSIG_COOLANT_ON goes active and the Gcode concludes with an m9 which turn the coolant off and the output signal
mc.OSIG_COOLANT_ON goes inactive.

In order to use this signal you need to connect a spare output on the ESS/breakout board combination to Machs output signal. First you assign an pin
in the ESS plugin PinsConfig tab, and then enable Machs coolant/dust output and logically connect the output the the pin you intend to use. See the pics.

Now you can use the output of the pin on the breakout bpoard to turn on a relay which would turn on your coolant pump if you had one, or your dust extractor,
but you could get really creative and have it turn on the beer pump....or better still a Bourbon pump....who said CNC had to be soberboring!

Craig

277
Mach4 General Discussion / Re: ATC Macro adjustment for reversed tool forks
« on: February 01, 2023, 10:14:45 PM »
Hi,
OK if you are reasonably sure that the code whatever it is and wherever it is adequate to return the machine to the new start point barring the lowering of the Z axis
prior to the <return to zero> thereby causing a tool contact....then by all means add an extra Y movement in the Gcode statements we have already identified.

Code: [Select]
------ Move Z to home position ------
 GCode = ""
 mc.mcCntlGcodeExecuteWait(inst, "G00 G90 G53 Z0.0\n
                                 g0 g91 y10\n
                                 g90\n")

As you can see I've added a little extra. The first line remains the same, namely the Z axis moves to the top of travel, but the second line moves the Y axis 10 units
relative to its current X, Y location, that's the meaning of g91, and the last line restores Absolute mode, ie g90.
Note I can'e be sure that you want to move positive 10 units or negative 10 units....you'll have to experiment.....slowly!

Craig

278
Mach4 General Discussion / Re: ATC Macro adjustment for reversed tool forks
« on: February 01, 2023, 09:55:25 PM »
Hi,
my machine does not have an ATC and so I could be well out to lunch here, but I was of the opinion that a tool change macro was in fact two macros,
the first stops the machine, records its state, then moves to the tool change location, changes tools and clamps the new tool in, and resets the machines state.
Thereafter the second half of the macro runs which does the tool touch off if required, and then does the preparatory move to the new start point.

I'd swear therefore that there is a piece of code missing, in particular that piece of code that does the preparatory move.

Craig

279
Mach4 General Discussion / Re: ATC Macro adjustment for reversed tool forks
« on: February 01, 2023, 09:26:42 PM »
Hi,
yes you could add an extra Y 'slide', and I'm assuming you mean Y axis movement? at that point but we are still missing the code that takes the controlled point back to the
new start point. I think adding a line of code WITHOUT at least inspecting the other code is likely to lead to disaster.

Craig

280
Mach4 General Discussion / Re: Soft limits offset
« on: February 01, 2023, 08:33:26 PM »
Hi,
the more I think about it the more I'm convinced that the problem you describe is not so much a fault as the way SoftLimits work, in fact have to work.

Lets say that your machine is 50mm inside the limit and yet your Gcode calls for another 60mm of movement, which would put it outside the limit.
If Mach were to attempt that move it would issue movement instructions in 1 millisecond time slices to the buffered motion controller, this is normal and how Mach operates.
However when 50mm of movement has occurred then its on the limit, so now the machine would have to decelerate to a stop. But what about those 1ms time slices that
are still in the buffer? If you abort them (like you would with a Limit switch event or an Estop) then you lose reference, because Mach does not know how many time slices
nor how much movement those times slices represent. So even if Mach did the clever thing and decelerated to a stop it wouldn't make any difference the machine would still
lose Reference....which sort of defeats the purpose of SoftLimits.

I can only conclude that Mach would just refuse to enact (ie just ignore) the last movement instruction that would cause it to go out of bounds. In which case it would stop
and the end of the previous instruction, say 50mm still short!

Craig

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