IMACS Engineering Run, Feb 23 - Mar 3, 2006
- IMACS Engineering Run, Feb 23 - Mar 3, 2006
- Tasks
- Personnel and Observatory Support Required
- Report
Tasks
Slit Mask Server
- Install mask stop rail.
- Change indexer card.
- General mechanical/electromechanical inspection.
Shack-Hartmann Guide Camera
- Check stiffness of mechanics.
- Measure flexure of the barrels.
- Map gmap acquisition field to actual range.
Grating Tilt Mechanisms
- Inspect 'near' proximity Sensor and replace if necessary.
- Configure and calibrate high angle tilt mechanism.
- Check zero points on all grating and recalibrate as necessary - time permitting.
Miscellaneous Maintenance and Other Work
- Investigate instrument travel issues.
- Look into reported f/4 shutter problems.
- Install new baffles on 150l grism and LDP.
- Time Permitting
- Derive new f/4 flexure map.
- Start design of MMIRS/WFCCD slit mask laser cutter jig.
Personnel and Observatory Support Required
SBS
- Tyson Hare; arrives Feb 24, leaves Mar 02.
- Alan Dressler
LCO
- Dave Osip
- Instrument Specialist
- Machinist
Report
Slit Mask Server
- Upon instection the ecoder head and slide rail were found loose. The threaded hole show signs of stripping. Loctite and washers were added to the fastening scheme.
- Software was updated with new encoder limit values (due to the loose components)
- Hardstop logic was not responding correctly. The motion didn't not stop when the forward limit was depressed during testing. This problem requires further investigation.
Shack-Hartmann Guide Camera
- Added a screw to the assembly mounting plate. Before the screw was added it was possible to tilt one corner of the assembly off its mounting surface slightly. This movement seems unlikely under normal conditions as there is no tendency for a strong force to occur in the manner needed to cause such a motion.
- Measurement of barrel motion, both axial and tangential to motion were found to be within known design parameters, with all measurement less than 25 um.
- A scratch was found on the Renishaw tape, at approximately 11.3 degrees. There haven't been any obvious operation problems associated with this issue, however the tape should be replaced.
Grating Tilt Mechanism
- A faulty proximity sensor was discovered and replaced by the mountain staff.
- A supply of spares was delivered and are in the parts cabinet.
- All other GTM work was postponed due to time constraints.
Miscellaneous Maintenance and Other Work
- Althought the instrument rollers appear to be working as expected, measurements show the instrument has moved axial more than design parameters. Looking at the mechanical connection to the NIR it was suggested that perhaps the set screws in the tripod spring plunger were not properly torqued, allowing the instrument to slide. Cup pin set screws will replace the lock screws currently in use. Further investigation provided no obvious reasons for axial motion.
- The instrument was repositioned so that the disk are centered on the rollers and reconnected to the NIR.
- This issue will be under continued monitoring.
General Notes
- current filters available for f/2 camera: Spectroscopic, B/V/R/I, 565-920, 6300-9500 WB, 4800-7800 WB, z1 430-675, z2 520-775, z3 608-863, 8200 NB, GG 495, GG 455
- both LDP and 150l baffles didn't fit? Check against design and solid model
- design LDP Hartmann mask
- Required Parts
- SMS encoder replacement
- Renishaw encoder tape, 20 um
- digital level
- Future Work
- measure guide camera centering
- investigate off-axis SHGC astigmatism
- further mechanical measurements
- check assembly for looseness
- remove barrel from stage and shake
- disassemble optics barrel and check for loose optics
- get slit mask design for image/mask movement test
- GTM zero point calibration
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