Need Help! More position repeteability sensor when homing?


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Thread: More position repeteability sensor when homing?

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    Default More position repeteability sensor when homing?

    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!

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    Community Moderator Jim Dawson's Avatar
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    Default Re: More position repeteability sensor when homing?

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

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

    Jim Dawson
    Sandy, Oregon, USA


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    Default Re: More position repeteability sensor when homing?

    Quote Originally Posted by felixpico View Post
    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

    Last edited by PCW_MESA; 09-04-2019 at 04:54 PM.


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    Default Re: More position repeteability sensor when homing?

    Quote Originally Posted by Jim Dawson View Post
    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!



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    Default Re: More position repeteability sensor when homing?

    Thank you very much for your answer PCW_MESA!



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    Default Re: More position repeteability sensor when homing?

    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!



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More position repeteability sensor when homing?

More position repeteability sensor when homing?