Surveying the tertiary
01may04 tertiary survey
Alfa was installed on 21apr04. The tertiary was resurveyed
by lynn baker and ellen howell on 01may04. Only 2 paddles were used (the
other had be bumped when re enforcing the turret.
The survey was done with the design files relative
to the P3 rotation
points of the tertiary. This separated out the rotation and translation
better than the dome center line origin. The offsets used were:
dsnModX= dsnX + 204. inches
The ter actuators get shorter as you increase the encoder:
dsnModZ= dsnZ + 385. inches
+ encoder hor moves away from secondary (-x dome centerline)
The measurements were:
+ encoder ver moves up.
In VxWorks: addprocdir ter &addprocdir ter/terfoc & terposinit
start at orig: 573035 549794 480800 456040 517300
Lynn measures -.77 x, -.16z .. inches correction to make (ignore tilt).
slewoff -.16 .77 0. (ver hor tilt) .. move to new position
pnt ter query .. get new position call P1
teroffToEncDc enc 0. 0. .031 (computer .031 angle rotation)
about initial orig
print enc ..
idl.. oldTail=517300; newTail= last of enc above; dif=oldTail-newTail;
pnt ter slew p2 list each element....
Tertiary survey results
tertiary survey results Tertiary encoder and potentiometer
09apr04 after kevlar cables installed before alfa
01may04 after alfa installed.