Mohamed replied to the topic 'Precise backlash measurement' in the forum. 3 years ago

DerPit post=70210 wrote: One thing you can try:
Most (all?) focusers have an option to reverse the direction.  So do an auto-focus run with the linear algorithm (that works around a possible backlash) in the normal direction, and write down the value (also look at the curve to verify it is a reliable one).  Then activate the 'reverse' option in the focuser driver, and repeat the AF run.  This time, because of the reversal, it will always end moving outward, and you get the focus 'coming from the other side'.  The difference between the two values you get that way would be your backlash.


Hi Peter,

Thank you for your suggestion, but when I tried it, I got variable readings. Please find the below table...

 

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