Gerber 408 retrofit

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18 Aug 2023 18:46 #278413 by tommylight
Replied by tommylight on topic Gerber 408 retrofit


You are correct that you can still use HALscope with the Gecko drives, however if you already have the hardware that can deal with interfacing the encoders to LinuxCNC, then why aren't you just using that setup permanently? It's much easier to tune the PID from the "calibration" dialog within LinuxCNC, rather than use the potentiometers on the Gecko drive.

I Am using it, well not me but a client i retrofitted the machines for:
forum.linuxcnc.org/show-your-stuff/47357...ines?start=10#257711
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Also, you can not tune Geckos form LinuxCNC, you still have to roughly tune Geckos on it's own, then use LinuxCNC and fine tune stuff.

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21 Aug 2023 18:18 #278631 by Gerber408
Replied by Gerber408 on topic Gerber 408 retrofit
@fdarling, sent you an email.

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27 Oct 2023 21:28 - 27 Oct 2023 22:05 #283923 by Gerber408
Replied by Gerber408 on topic Gerber 408 retrofit
Deleted - was not relevant.
Last edit: 27 Oct 2023 22:05 by Gerber408. Reason: Didn't go where I thought it would, so rewrote an appropriate post.

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05 Nov 2023 02:53 #284591 by Mikexx
Replied by Mikexx on topic Gerber 408 retrofit

So, if I understand correctly, the step on time, step space, direction hold, direction space should be doubled as a starting point?

I found this info online and believe that it may be accurate:
for the X, and Y axis which should allow me to calculate my scaling.
servo encoder counts per revolution: 4000
Servo teeth: 28
Lead screw teeth: 70
Pitch: 20mm
counts per mm: 500


Can you please confirm the "servo encoder counts per revolution"? The RM21D datasheet implies the optional count ranges from 5 to 2,048. While it has a 2,000 option it's not obvious if this is per channel or overall encoder count?

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05 Nov 2023 05:43 - 05 Nov 2023 05:45 #284598 by SkyMoCo
Replied by SkyMoCo on topic Gerber 408 retrofit
If your interested, I have done a complete 408 retrofit and I keep my configs on github.    

github.com/SkyMoCo/LinuxCNCConfigs

There are some other configs there for steppers on other machines, the XY axis are the same, but the Z is different.  
Last edit: 05 Nov 2023 05:45 by SkyMoCo. Reason: Clarification

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10 Jan 2024 05:45 #290327 by fdarling
Replied by fdarling on topic Gerber 408 retrofit
Here is the progress with the retrofit motherboard, I am just a couple "work days" away from sending the design off for fabrication.
Attachments:

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14 Jan 2024 05:34 #290615 by KeithT
Replied by KeithT on topic Gerber 408 retrofit
I can hardly wait to see it working. I'll be in line for one.

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11 Feb 2024 08:00 #293064 by fdarling
Replied by fdarling on topic Gerber 408 retrofit
I received the prototype batch of PCBs, and have begun testing (photo attached). I have verified that the following is working:
  • ±10V analog outputs to servo drives
  • encoder inputs
  • servo drive related outputs: enable & alarm reset
  • servo drive related inputs: drive ready & alarm
  • limit/home switch inputs
  • spindle enable relay
  • "vacuum" & "router" outputs (drive relays in the electrical cabinet that control 120VAC outlets)
  • expansion spindle probe and tool probe inputs (24V/5V selectable power, PNP/NPN selectable trigger)
  • SmartSerial expansion (6 channels, up to 8 if not using Mesa PacketUARTs)
What remains to be tested:
  • the isolated USB areas
  • the isolated RS-232/RS-485 areas (driven either from USB or from Mesa card PacketUARTs)
  • step/direction outputs on axis expansion headers
  • E-stop connector
  • bolting the motherboard into the cabinet (verifying mounting hole matches)
I will keep you guys posted! If all goes well, I will be ready to start shipping these units very soon. If you are interested and haven't already contacted me, please email me at my forum username at gmail dot com.
Attachments:
The following user(s) said Thank You: tommylight, besriworld

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26 Feb 2024 11:49 #294504 by fdarling
Replied by fdarling on topic Gerber 408 retrofit
I have completed testing the Gerber Sabre LinuxCNC retrofit motherboard, and everything works! I attached a photo of the motherboard installed in the electrical cabinet, as well as a photo of the original motherboard for reference. There is also a screenshot of LinuxCNC.

My retrofit kit includes:
  • retrofit motherboard PCB with Mesa 7i80HDT preinstalled
  • 8x M3 mounting screws (in case the original motherboard/screws were missing)
  • HP small form factor PC with LinuxCNC preinstalled, featuring built-in WiFi
  • optionally: 1920x1080 IPS LCD monitor w/ wide viewing angle, and wireless keyboard/mouse
If interested in purchasing a kit, please email me at my forum username at gmail dot com. I currently have 4 available, though I can have more fabricated with some lead time (I am guessing 2-3 weeks).
Attachments:
The following user(s) said Thank You: tommylight

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