astrogene1000_stuff post=70105 wrote: If the focus routine always moves to final position in the same direction then oversizing the backlash steps when reversing basically makes it a do not care because the backlash cancel's out.
Think about it this way, currently at 500 with actual backlash = 25
Move back 200 physically moves it to 325 (175 = 200 - 25 backlash), counter though shows 300
Move forward 200 (physically moves 175 = 200 -25 backlash) up to 500 physical and counter shows 500
Hi Gene,
The problem is as Ihoujin mentioned if you are approaching the final focus point from one direction as in linear it won't matter, but the problem is that (1) IN and OUT backlashes could not be equal, and (2) This confuses the algorithm as at the final position, the algorithm is not equally going IN and OUT, and that is the cause of the shift of backlash that causes the problem.
Read More...
© 2003-2022 by INDI Library. All rights reserved.