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You are probably paying for more expensive electronic parts. Probably the cheap version doesn't have an fpga chip . I think you give most of the money. Buy the expensive version.
For PC, just choice an old workstation. You can review the latency test topic

Thanks for the info,

I am getting the Encoder battery its literally like $4 here are my cost options if anyone else needs this for future reference price is ex shipping and import fees

EL7-EC1000N - With 1000W (3.18nm) motor + Brake + Cables and Battery - $255 per Axis
EL8-EC1000F - With 1000W (3.18nm) motor + Brake + Cables and Battery - $351 per Axis
EL7-EC1500N - With 1500W (6.00nm) motor + Brake + Cables and Battery - $449 per Axis

I am not sure if the EL8 is work the $96 extra

Yeah I am looking at getting refurbed Beckhoff El2008, El1008 with the EK1100 Coupler. I was not planning on keeping the hand wheel but the Mesa card does not look to bad.

Do you have any tips for PC wise to run LinuxCNC? I am looking at industrial PC's but they have stoneage hardware for the price of a high end gaming rig xd. Would a Pi or Intel Nuc be viable here, I want to make this a decent retrofit but as a home mill I have to be realistic with the components I choose.

1.

"python3\r": Datei oder Verzeichnis nicht gefunden

Das deutet auf Windows-Textformatierung. Verwendest du Windows um den Text zu kopieren?

2.

execv(./interval.py): Permission denied

Deutet darauf hin, dass du die Datei 'interval.py' nicht zum Ausführen freigegeben hast.

Either L7ec or L8ec is fine. The former is cheaper while the latter is a bit more expensive. I don't feel much difference in use. Try to buy the encoder cable with battery. It can be configured to use absolute value. In this way, the limit and origin switches are saved. For io, ek1100 plus el1008, el2008 and ek5102 should be enough (ek5102 is used for handwheel encoder). I feel that Beckhoff is a bit expensive. You can also use mesa7i92 card. I am currently using ethercat bus servo drive and 7i92. 7i92 is mainly used for handwheel and tool setting.

"The 5' chunk of accordion material I think was ~$20,"
Where can we buy it?

Not sure about the analog input of your MESA hardware but it might be possible to use a MESA THCAD board which converts DC voltage to frequency and connects to an encoder input. But you would need to check if it is suitable for 3.3V

'M52 Pn' is Gcode so it would have to go into the Gcode program or be issued as an MDI command.

once you have the voltage (or frequency ) in HAL you can do all kinds of things including a PID loop to control the feedrate also a GUI panel should be trivial then.

Thank you, I am still far out from this project as I have not purchased anything yet, I want to make sure I know what I need and what I'm buying. I am currently learning about Ethernet ports with real-time operations and which PC to use for this.