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  • Lcvette
  • Lcvette's Avatar
06 Jun 2025 23:45

New "BIG" Probe Basic Release for Develop Branch Incoming!

Category: QtPyVCP

not sure what you are referring too with G43, it changes here but you must have a tool called with it to set the offset. no tool in the spindle will give no g43. here with tool in the spindle g43 works as expected and can swap back and forth between G43 and G49 and it shows as expected in the machine status column on the right side.

as for the probe question, im not sure what you are meaning? all probing in probe basic is predicated on using a wired probe or tool setter that can sent a signal to linuxcnc letting it know a probe move and event have occurred and been recorded.

can you elaborate on both above topics so i can better test and answer?
  • COFHAL
  • COFHAL
06 Jun 2025 23:45

W5100S-EVB-PICO stepgenerator and encoder driver

Category: Driver Boards

That's what I thought, the problem is that many drivers have differential feedback encoder outputs and I would have to use another IC to convert +Z - Z to Z.
  • tommylight
  • tommylight's Avatar
06 Jun 2025 23:32
Replied by tommylight on topic Flyback diode mesa 7i95t

Flyback diode mesa 7i95t

Category: Driver Boards

... it aggravates me when I see opto circuits with the input and output sides connected to a common ground.

+1
  • tommylight
  • tommylight's Avatar
06 Jun 2025 23:29
Replied by tommylight on topic Flyback diode mesa 7i95t

Flyback diode mesa 7i95t

Category: Driver Boards

A really big relay should not need arc suppression.

Please do some research before making such statements, especially after it has been answered by a VERY experienced member of this forum.
And who asked about MosFET's ?
  • unknown
  • unknown
06 Jun 2025 23:24
Replied by unknown on topic Position: relative expected

Position: relative expected

Category: General LinuxCNC Questions

I'm pretty sure Tommy would disagree with that, personally I've never had any issues with HP gear, even the ancient server I was running 24/7.
I'd say that there are quite a few HP machines running Linuxcnc that never give any issues.
  • unknown
  • unknown
06 Jun 2025 23:19

IO Questions around mixing IO between Ethercat and Pi 5?

Category: EtherCAT

Yeah, a manual MPG shouldn't require reading at the same rate as would be required for spindle encoder.
Just remember that the RPi io is only 3.3v tolerant, so a way of translating the MPG signal voltage and protecting the RPi io from noise.
The 74lvc series are 3.3v devices that are 5v tolerant on their inputs.
  • jhandel
  • jhandel
06 Jun 2025 23:11

IO Questions around mixing IO between Ethercat and Pi 5?

Category: EtherCAT

so your saying take the Pi GPIO and put it on a server thread not on a realtime thread?
  • unknown
  • unknown
06 Jun 2025 23:10
Replied by unknown on topic Flyback diode mesa 7i95t

Flyback diode mesa 7i95t

Category: Driver Boards

Some do some don't, you'll need to check the data sheets.
The role of the diode is to protect the driving circuit from the reverse voltage generated from the collapse of the magnetic coil. No flyback will eventually cause component failure, a far bigger issue than EMI.
I'd take PCW's advice.
Another thing I would look at is the routing of your wiring and ensuring physical seperation of control and AC, if you haven't already taken care of this issue.
If you do use optos make sure that the input side and output side are powered by seperate PSUs and the ground are not connected, it aggravates me when I see opto circuits with the input and output sides connected to a common ground.
  • PCW
  • PCW's Avatar
06 Jun 2025 23:04
Replied by PCW on topic Flyback diode mesa 7i95t

Flyback diode mesa 7i95t

Category: Driver Boards

The issue here is that the relays are switching a 120VAC solenoid.

Because the solenoid is an inductive load, this will cause massive EMI unless
there is contact arc suppression across the relay contacts. This can be done
with a bipolar TVS diode, a MOV or an RC arc suppressor.
  • langdons
  • langdons
06 Jun 2025 22:57 - 10 Jun 2025 14:38
Replied by langdons on topic Flyback diode mesa 7i95t

Flyback diode mesa 7i95t

Category: Driver Boards

Flyback diodes might increase contact arcing becuase they slow down the release of relay contacts.
  • unknown
  • unknown
06 Jun 2025 22:56

IO Questions around mixing IO between Ethercat and Pi 5?

Category: EtherCAT

Shouldn't be an issue, as all you you are doing is adding another function, servo thread should be ok for MPG.
Give it a go and see what happens.
  • langdons
  • langdons
06 Jun 2025 22:53 - 10 Jun 2025 14:37
Replied by langdons on topic Flyback diode mesa 7i95t

Flyback diode mesa 7i95t

Category: Driver Boards

Redacted.
  • RogEnk
  • RogEnk
06 Jun 2025 22:48

New "BIG" Probe Basic Release for Develop Branch Incoming!

Category: QtPyVCP

Thanks for this Chris, especially pleased to seeing the lathe part getting TLC 

I switched to develop branch and did the uninstall and reinstall, went like a charm!
I noticed that unlike Gmoccapy issuing G43 doesn't update the active G codes, G49 remains, is that expected?

Now for the newby bit, does tool touch off only work with an active (or passive) probe, so I need a probe wired in and configured to set tool offsets?
Or is this a G49 artifact from above?

Thanks again for this awesome interface and your work!
  • PCW
  • PCW's Avatar
06 Jun 2025 22:20 - 06 Jun 2025 22:34
Replied by PCW on topic Flyback diode mesa 7i95t

Flyback diode mesa 7i95t

Category: Driver Boards

Then you need arc suppressors across the relay contacts.

Possibly something like this:

www.digikey.com/en/products/detail/bourn...OV-10D201KTR/2408223

Note that it looks like the relays have their own drivers, so the 7I95T does not need
any flyback diodes.
  • Sternfox
  • Sternfox
06 Jun 2025 22:18
Replied by Sternfox on topic Flyback diode mesa 7i95t

Flyback diode mesa 7i95t

Category: Driver Boards

They are 120v ac so unfortunately can't use flyback diode.
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