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  • tommylight
01 Dec 2025 08:16
Replied by tommylight on topic The Current Bread & Butter Setup?
That was very close to what you describe, i had some Serial Absolute Encoders that would cause me much grief to replace mechanically, so it was magnificent that PCW made the firmware i could use with those encoders.
BTW, that machine is still in daily use, and never gets powered off. :)
  • unknown
01 Dec 2025 08:11
Replied by unknown on topic The Current Bread & Butter Setup?
I was think along the lines of "I would like the mesa firmware to support this piece of hardware I have" which may or may not have been retrieved from a Soviet UFO warehouse.
  • Z3n
01 Dec 2025 08:09
Replied by Z3n on topic Red Init & Done Lights on 7i92M
From the manual, it says that it handles the passthrough power via otherwise unused pins on the cable, so that seems like a fine solution to me. As they control both sides of the board, it's not like you need to worry about things going wrong in that sense (as long as you use the appropriate cable).  It's also nice to simplify the power wiring a little bit.  

I will definitely let you know if I find some other solution that seems more appropriate for whatever reason, but I figure designed and documented in the manual is probably good to go :)
  • unknown
01 Dec 2025 08:08
Replied by unknown on topic Chinese Mesa 7I92 from aliexpress NEW
I would like to apologise to the OP for my remarks to his original post.

I have been shown to be unkind and unhelpful. My fellow forum members have been very gracious.
  • tommylight
01 Dec 2025 08:07
Replied by tommylight on topic The Current Bread & Butter Setup?

Customised firmware, based on the available source, is no issue to have built. So far I haven't seen requests for new firmware features. Maybe this has happened I can't say for sure either way.
Does this qualify:
forum.linuxcnc.org/30-cnc-machines/31792...rofit?start=20#85721
  • unknown
01 Dec 2025 08:04
Replied by unknown on topic Red Init & Done Lights on 7i92M
I wouldn't call my solution a preferred one, it's just the implementation I chose.
Please ask questions and do some research, I'd hate for my way to be sub par and lead another member the wrong way. So far nothing has gone wrong.
If you do find any info to the contrary I would be most appreciative if any failings in my advice were pointed out.

Rob
  • unknown
01 Dec 2025 07:57
Replied by unknown on topic The Current Bread & Butter Setup?
They do seem somewhat robust, but there is always a chance. Not to sound like a doom goblin.
Whilst I have no empirical evidence, not having the resources nor $$$ to test, I feel (for lack of a better word) that Ethernet does provide some electrical isolation as opposed to direct GPIO connection.
Ethernet also frees you from being shackled to a single platform.

Tommy provides some very good information. Whilst to forum may appear to be a little biased based it would come down to a few points.
Tommy's mention of performance.
Reliability.
Wide range of options regarding hardware.
Many many more inputs than via GPIO.
The fantastic support from PCW, even when dealing with cloned items bought off AliExpress, or those building there own custom boards using dev boards and hashed together sundry parts.
Customised firmware, based on the available source, is no issue to have built. So far I haven't seen requests for new firmware features. Maybe this has happened I can't say for sure either way.
And finally, which I almost forgot, the knowledge of many of the forum members.
  • MaHa
01 Dec 2025 07:28
Replied by MaHa on topic Problem with linear movement
I didnt expect a hickup in the virtualbox can interfere functionality of linuxcnc. But after restart, i can not reproduce this problem in axis and flexgui. 
I have  version 2.7
Lucky its solved by itself. 


 
  • dlamb020
01 Dec 2025 07:16
Anilam retrofit, mesa 7i92tm + 7i77; Velocity mode SMA7215 tach servo amps was created by dlamb020
First time retrofit to linuxCNC, using pncconf to tune the PID loop.

Any advice would be great on initial pid settings.

glentek velocity/tach servo amplifiers SMA7215 
Single ended 1000ppr encoders

Critical response achieved on each servo amp, it is not overdamped yet when i adjust I/D/BIAS/DEADBAND it overdraws

Any advice for first time setup would be very much appreciated

 
  • tommylight
01 Dec 2025 07:15
Replied by tommylight on topic The Current Bread & Butter Setup?
In short:
RPI can do at most 20000 steps per second, if lucky and with a bit of fiddling (this is from what i read here, i stopped using RPI since version 3B)
Mesa can do 10000000 (10 million) steps per second on any or all pins, if pushed, does 1-4 million for years on end, can use any pin as input or output, does steps, encoder counts, PWM, on any pin (the FPGA part), can be programed as needed, extremely reliable (i have over 80 or 100 or i have no real clue in daily use on industrial machines weighing several tones without a single issue ever for many years), and by far the best support on planet earth in the form of PCW.
Yes i am biased, from experience, no i am not payed by them, and yes any price you see for Mesa boards i have to pay at least twice that, and i pay it gladly for the piece of mind i get with them, i can sleep calmly without worrying something might fail.
-
As for RPI, i personally use old "enterprise" PC's and some laptops, so if you can find such things it is another alternative, i can get Lenovo T470 for 120-150 euro, with 14" touchscreen, battery, plenty of RAM and NVME, with built in network jack, for me this is much cheaper than any RPI combo and more powerful and usable.
  • Aciera
01 Dec 2025 07:11
Replied by Aciera on topic Problem with linear movement
What version of linuxcnc?
  • Pudding1960
01 Dec 2025 06:28
Replied by Pudding1960 on topic Probleme beim Bohrfräsen
Hab mich Undeutlich ausgedrückt.. G54 hab ich auf die Bohrung gesetzt.,auch auf der Ecke mit G54 das selbe Ergebnis. Für beide hab ich jeweils einen G Code Generiert. Problem hab ich Temporär gelöst durch Antasten der Bohrung und setzen des Nullpunkts G55 auf die Bohrung. Anscheinen ist es immer ein Problem wenn ich den Nullpunkt auf G54 setze.
  • Billy Boy
01 Dec 2025 06:20
Replied by Billy Boy on topic The Current Bread & Butter Setup?
Huh... I've not experience a properly powered and cooled rPi going bad. Maybe I've been real lucky?

Does the Mesa support tighter step timing accuracy than the "base thread" step generator?

I was not aware that the Mesa gave improved performance? Is there a reference-able document that gives a *quantitative* analysis of this performance gain?

Thank you,

BB
  • Z3n
01 Dec 2025 04:24
Replied by Z3n on topic Red Init & Done Lights on 7i92M
Ahh, well, so it goes. I've ordered a 7I76U because I think that the D models were actually going to be more difficult to wire anyways, as I'd like some sourcing outputs.  I'll see about getting an RMA for the 7I77D I have, and can function test the existing 7I76D when I get the new 7I92TM.  5 axis + spindle and 48 I/O pins should be plenty to get this mill up and running, and that leaves me some boards to experiment with in the future :)

Thanks for the quick replies, nice to keep momentum up on the project!
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