[felixpico]

Please, I am designing my own CNC Milling Machine. Now I need to be clear about Home Position. I will use stepping motors with open loop control. No encoders. What is the more accute sensor for home position?. I want to go always to the same position whenever I switch off and on my machine. I have read thar mechanical switches (lever or plunge type) and inductive are not good solutions.
Thanks in advance!
Best regards!

[Jim Dawson]

It depends on the mechanical switch, there are precision switches available.

https://www.automationdirect.com/adc...limit_switches

[PCW_MESA]

Please, I am designing my own CNC Milling Machine. Now I need to be clear about Home Position. I will use stepping motors with open loop control. No encoders. What is the more accute sensor for home position?. I want to go always to the same position whenever I switch off and on my machine. I have read thar mechanical switches (lever or plunge type) and inductive are not good solutions.
Thanks in advance!
Best regards!

Another way with inexpensive switches is to combine a linear switch _and_ a proximity sensor or optical switch that detects a slot on
a disk mounted to the step motor shaft. With just a 3.25" disk (~10" in motion at disk edge per turn) you get a ~50x improvement in switch
accuracy assuming 0.2" (~5mm)/ turn screws

[felixpico]

It depends on the mechanical switch, there are precision switches available.

https://www.automationdirect.com/adc...limit_switches

Thank you very much for your answer!

[felixpico]

Thank you very much for your answer PCW_MESA!

[felixpico]

And what about this type of 5volts opto? How accute are they? Do anyone have any opinion about "Hall effect magnetic sensor"?
Thanks in advance!