[INSTRM-1051] Ensure that hexapod moves always move _up_ to final position. Created: 14/Aug/20  Updated: 13/Jan/21  Resolved: 30/Sep/20

Status: Done
Project: Instrument control development
Component/s: ics_enuActor
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Normal
Reporter: cloomis Assignee: arnaud.lefur
Resolution: Done Votes: 0
Labels: SPS
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Attachments: PDF File PFS_SM1_Hexapod_Positioning_Repeatibility (1).pdf    
Issue Links:
Relates
relates to PIPE2D-584 Dithered images are not properly dith... Won't Fix
Story Points: 4
Sprint: SM1PD-2020 G2, SM1PD-2020 H

 Description   

Can the hexapod driving code always ensure that the slit moves up to the final position? I.e. if the target position is below the starting position, the hexapod should be moved past/below the target position first. Or maybe moves should always go past/down, then back?

This would at least make moves consistent w.r.t. gravity.



 Comments   
Comment by arnaud.lefur [ 03/Sep/20 ]

I have two options:
use hysteresis compensation from hexapod controller or add my own control layer.

Comment by arnaud.lefur [ 30/Sep/20 ]

merged in 1.1.0

Comment by hassan [ 13/Jan/21 ]

Added document PFS_SM1_Hexapod_Positioning_Repeatibility (1).pdf that describes improvement following fix to this ticket.

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