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Messages - joeaverage

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491
General Mach Discussion / Re: Mach3: Formula Axis Correction
« on: October 10, 2022, 03:53:36 PM »
Hi,

Quote
Yes, but it is possible to do it internally in Mach3 or Mach4?

Its been nine years since I've used Mach3 so I'm just not going to bother trying to answer that.....but it does work with Mach4, but not in the way you are thinking about.

You want to commit the job to Mach4 and have it apply a formula correction, and to my knowledge that won't work. In fact there is NO Formula correction feature in Mach4,
I presume because there is no way to have it work consistently without the correction being applied in a lump with the same problem that Mach3 had. My procedure
was to pre-process the Gcode file. That I used Mach4 and Lua to do that is just happy circumstance....you could pre-process a file using a Python program just as easily.

Craig

492
General Mach Discussion / Re: Mach3: Formula Axis Correction
« on: October 10, 2022, 03:35:29 PM »
Hi,
I had a procedure that did just exactly that, which I used for some time on certain jobs. At that time my axes were out of square to the tune of 0.3mm per 100mm.
Using formula correction in Mach3 did not work because the correction is applied 'in a lump' at certain times and that in turn caused what amounts to an infinite acceleration
and therefore the machine would stall.

To counter this I wrote a script, note by this time I was using Mach4, so the script was in Lua to apply the correction. This was possible because the Gcode programs I was using were all
linear moves in X and Y, and my scheme would not have worked if there were any arc moves, namely g2 or g3 moves. Provided your Gcode includes no arc moves you could do as
you have proposed, although the extra layer of complexity becomes very tiresome and correcting the machine fault is still the best option.

The procedure was run the script over the Gcode program and the script would write a new 'corrected' Gcode program where the X and Y ordinates had been corrected a little to
accommodate that they were not square to each other, and then run the 'corrected' Gcode file as opposed to the raw file.

I have since built a new machine where the axes are square and no such correction is required.

Craig

493
Hi,
see the attached pic, it is of the ESS plugin HC (Height Control) tab. Note that there are a few options, from no HC, to manual HC,
to two hardware HC types, namely Up/Down pins like the familiar Proma type THC controller and WarpRunner/TMC type controllers.

Do you have either a Proma type or a WarpRunner/TMC type controller?

Craig

494
Hi,
I can't really understand the point of this thread......THC is a realtime hardware thing not Gcode at all.

It's true that  Fusion 360 post generates Gcode from the Fusion tool path...but what Gcode command says 'Go up a little' or 'Go down a little'.....there is no such
Gcode instruction, and even if there were all Gcode instructions have to pass through the motion buffer, easily 100ms delay. That's not THC, THC is, or needs to be, realtime or close
to it.

Also this board is about Mach4....its not really about Autodesk software. All the excerpts that have been posted in this thread are from Autodesk's post processor which
is in C# if I understand it correctly....it's got nothing to do with New Fangled Solutions software at all. No doubt Mach4 users whom also use Fusion (as I do) am interested in Fusion posts
and so its not unreasonable to post on this board.......but strictly speaking this is not a Mach4 issue at all.

The ESS supports THC, in particular it supports the WarpRunner board, and that board is similar to the TMC board that precedes it. With the WarpRunner board and the plugin recommended
for it by Warp9 then THC works just fine.

Craig

495
Hi,
I think that field if for human benefit only. That is to say you can put a description like "probe wire, red with black stripe, fourth screw terminal from the right". It is simply for your benefit
so you can recall the nature of the signal many months or years down the track.

Craig

496
General Mach Discussion / Re: Total large screen mach3
« on: October 06, 2022, 05:58:39 PM »
Hi,
back when I used mach3, which I must admit was 8-9 years ago, I found the Mach3 screen just a little too cluttered for a touch screen to be reliable.

Mach4 (I been using for 8-9years) has a very good editable GUI.....so you can modify the screen anyway you like, including making it more suitable for a touch screen.
Try it out.

Craig

497
General Mach Discussion / Re: E-Stop During a Cut
« on: October 05, 2022, 07:18:38 PM »
Hi,
you should not use Estop.....ever except in an emergency.

If you want to stop a program during a cut use <FeedHold>.

When you Estop the machine does an emergency shutdown, any moves in the motion buffer are deleted. Thus you lose reference, it maybe just a few steps but could be many steps.
Either way if you restart Mach those lost steps will interfere with the accuracy of your part, possibly even wreck it.

If you use <FeedHold> then the machine stops but only after it drains the motion buffer and decelerates to a stop......all without losing steps. From the time you hit <FeedHold>
until the machine stops depends on the motion buffer. The ESS has a default motion buffer of 180ms, so you can say that the machine will be stopped within 0.2 seconds,
which is pretty close to instantaneous. The advantage is that once your ready to start again you hit <CycleStart> an the machine starts from where it left-off but without any missing
steps.

Its been some years (8-9) since I used Mach3, and in fact don't even have a copy of it anymore, I use Mach4  instead, so I can't remember whether Mach3 has the ability to change or
program its behavior on <FeedHold>, it certainly does in Mach4. See the attached pic. You can choose whether a <FeedHold> stops the spindle and you can also choose whether a <CycleStart>
starts the spindle again after a <FeedHold>.

Craig

498
Mach4 Plugins / Re: Mach 4 wont recognise UC100 controller
« on: October 04, 2022, 06:23:43 PM »
Hi,
to my knowledge the UC100 does not support backlash compensation....but even if it does, backlash compensation is 'flaky' at best.
There is no solving backlash with software, not properly.

Craig

499
Hi,
I wrote those scripts seven-eight years ago and have used them thousands if not tens of thousands times since. I do not recall ever having the problem you describe.
In particular your description of when a data triplet is committed (to append to the open file) does not make sense to me. If your installation is doing that, then why is mine not?
I suppose its not impossible that the CSMIO plugin and the ESS plugin differ in in such a manner as to cause the data to 'hang up'.

Either way you have the source code, you may just have to modify it to suit your installation. You might think about 'flushing' data to the file at each g31 read. A bit clunky
but it would solve the issue.

Craig

500
Mach4 General Discussion / Re: Soft Limit Problems
« on: October 03, 2022, 04:14:28 PM »
Hi,

Quote
the real issue is when it totally ignores the soft stop.

It should not do that ...ever. If it does then there is a fault no no amount of fiddling with acceleration or shifting the Soft Limit trigger points will solve.

Craig

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