LinuxCNC compatible industrial PC

meister
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13 May 2025 07:56 #328355 by meister

Replied by meister on topic LinuxCNC compatible industrial PC

what do you all have against a raspberry pi?
it works well and there are all kinds of cases for it.
2. NIC via USB

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unknown
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13 May 2025 08:00 #328356 by unknown

Replied by unknown on topic LinuxCNC compatible industrial PC

Mostly it's a "bang for buck" issue.

I can argue for & against it.

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hermann1976
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13 May 2025 08:42 #328358 by hermann1976

Replied by hermann1976 on topic LinuxCNC compatible industrial PC

I installed an ASRock N100DC-ITX and am very happy with it. It already includes a processor and has the advantage of running on a laptop power supply.
Recommendation from talla83:

I can confirm the stated latency times.
Regards Hermann

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workshop54
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13 May 2025 17:38 #328404 by workshop54

Replied by workshop54 on topic LinuxCNC compatible industrial PC

Thanks for all the input and suggestions!

I’ve decided to go with a Fitlet3 — mainly because of its industrial build quality and the fact that there’s a local supplier offering a 30-day no-questions-asked return policy. That gives me some peace of mind while testing it with LinuxCNC and Mesa.

I’ll post an update once I have some real-world results to share.

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langdons
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13 May 2025 18:32 #328406 by langdons

Replied by langdons on topic LinuxCNC compatible industrial PC

What about some souped-up Raspberry Pi?

(Max CPU, RAM, etc.)

What voltage does it run on?

You can get very inexpensive DC power supplies from Aliexpress or Digi-Key.

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tommylight
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13 May 2025 19:21 - 13 May 2025 21:26 #328410 by tommylight

Replied by tommylight on topic LinuxCNC compatible industrial PC

Yeah, sorry LangdonS, but do not use inexpensive power supplies, not worth the headache they cause, the time wasted finding they are the problem, nor the damage they might cause, and some are danger to life by not being isolated from the mains.
At a minimum use MeanWell or even better Delta, the price difference is not big.
Also, using old laptop power supplies is a very good idea, they are very high quality and do not fail.
For 5V supplies, there are very cheap and good quality ones form Anker, Baseus, Satechi, Gembird, just look for 5V only, so no QC or PD, always under 10$, isolated, protected, low ripple, etc.
-
Another good idea is those same companies but the 65W PD adapters, use a trigger board set to 20V, they can be found on sale for 15-20$. I have plenty of these, like everywhere.
Waiting for 140W/28V ones to drop in price, one of these can easily handle 4 of so called TB6600 drives at full load with low inductance motors.
Although from experience, they really do not like back EMF. I killed one testing drones, as soon as you pull back the throttle fast = they die!

Anker 65W, only the output in use died, the second output still works fine.

Last edit: 13 May 2025 21:26 by tommylight. Reason: typo

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langdons
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13 May 2025 20:11 #328416 by langdons

Replied by langdons on topic LinuxCNC compatible industrial PC

Yeah, buy Mean well or delta from Aliexpress.

Are you making fun of my name?

Delta are probably worse because the 12v delta power supply has only 16V caps!

Plus the volage can be adjusted as high as like 14V; that's only 2V of headroom!

And my name is Langdon.
My last name is Staab.
Langdon S.
langdons

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tommylight
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13 May 2025 21:25 #328422 by tommylight

Replied by tommylight on topic LinuxCNC compatible industrial PC

Sorry, typo, fixing it now.

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dbtayl
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13 May 2025 23:06 #328425 by dbtayl

Replied by dbtayl on topic LinuxCNC compatible industrial PC

tommylight wrote:
do not use inexpensive power supplies, not worth the headache they cause, the time wasted finding they are the problem, nor the damage they might cause, and some are danger to life by not being isolated from the mains.

Definitely this! Bad power supplies are a nightmare. Maybe they work OK. Maybe they just die early. Worse cases are fire/shock, impossible-to-diagnose issues, dying and taking your entire system with it, etc. Some of the cheap supplies are terrifyingly bad.

Years back I was working with Intel NUCs in an automotive application. They would have all sorts of strange behavior- crashes, reboots, stuttering, video artifacts, ...- when run off a cheap inverter. Apparently the inverter was sufficient to cause problems... after going through the 110Vac -> 19V DC adapter, and the internal 19Vdc -> 12/5/3.3/1.8Vdc converters.

Slightly more on topic, I've got a fanless Celeron PC like this one (looks like it at least, I don't have the exact model, but it's a J6412 chipset): www.amazon.com/HUNSN-Fanless-Industrial-...g/dp/B0CGLR51SL?th=1
It's... fine. Jitter numbers are nothing special (~30000 ns IIRC), but I also haven't had any thermal issues with it. I admittedly haven't watched the CPU temperature directly to have hard data to back that up, and my shop space is stably at a relatively low temperature. I specifically wanted fanless so there was no place for dust, metal chips, etc. to ingress.

I suspect you can lock the CPU frequency at the lowest to keep temps down, though I haven't bothered.

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tommylight
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13 May 2025 23:16 #328427 by tommylight

Replied by tommylight on topic LinuxCNC compatible industrial PC

In Linux you can always check temperatures with
sensors
in a terminal, it will show something like this

cnc@512NVME:~$ sensors
coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +38.0°C  (high = +80.0°C, crit = +100.0°C)
Core 0:        +30.0°C  (high = +80.0°C, crit = +100.0°C)
Core 4:        +31.0°C  (high = +80.0°C, crit = +100.0°C)
Core 8:        +27.0°C  (high = +80.0°C, crit = +100.0°C)
Core 12:       +31.0°C  (high = +80.0°C, crit = +100.0°C)
Core 16:       +32.0°C  (high = +80.0°C, crit = +100.0°C)
Core 20:       +30.0°C  (high = +80.0°C, crit = +100.0°C)
Core 28:       +32.0°C  (high = +80.0°C, crit = +100.0°C)
Core 29:       +32.0°C  (high = +80.0°C, crit = +100.0°C)
Core 30:       +32.0°C  (high = +80.0°C, crit = +100.0°C)
Core 31:       +32.0°C  (high = +80.0°C, crit = +100.0°C)

hidpp_battery_0-hid-3-3
Adapter: HID adapter
in0:           0.00 V  

acpitz-acpi-0
Adapter: ACPI interface
temp1:        +27.8°C  

amdgpu-pci-0300
Adapter: PCI adapter
vddgfx:      768.00 mV 
fan1:           0 RPM  (min =    0 RPM, max = 3000 RPM)
edge:         +41.0°C  (crit = +100.0°C, hyst = -273.1°C)
                       (emerg = +105.0°C)
junction:     +43.0°C  (crit = +110.0°C, hyst = -273.1°C)
                       (emerg = +115.0°C)
mem:          +44.0°C  (crit = +100.0°C, hyst = -273.1°C)
                       (emerg = +105.0°C)
PPT:          10.00 W  (cap = 219.00 W)

nvme-pci-0400
Adapter: PCI adapter
Composite:    +31.9°C  (low  = -273.1°C, high = +69.8°C)
                       (crit = +79.8°C)

cnc@512NVME:~$

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