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| * Type B Past Week Summary * Fabian, Mark and Liu-kun did BS installation at Kamioka: * Debugged the issue with the BF keystone being tilted enough to cause rubbing on the yoke for the magnets. It was solved by moving the yoke ≈1 mm taking advantage of the oversized holes. * Measured the height of the payload as a function of trim mass. The BF spring seems to have a slightly lower load capacity and a rather higher spring constant than when it was remeasured by Hirata-san. * Removed IM trim mass to set the average height of the keystone to the CAD value. * Moved IM trim mass around to set the pitch of the dummy BS. * Hirata-san * TBD. |
* Hirata-san: * Made BS disposable wire clamp 3Dmodel and drawings. * Made ballast mass drawings for BS Bottomfilter and Standardfilter. * Made parts list and screw list for disposable wire clamp and ballast mass. * Sent drawings and lists to i-ject for quotation. * Start to make drawings for SR big parts (optical bench,damper rings,sus wires,cable clamps) - ongoing. * Mark, Fabian and Enzo (at Kamioka): * Realized that some of the imbalance in the BF was from the fishing rod and calculated a new set of blade offsets to center the rod but leave the torque from the FR to be cancelled by the trim mass for now. * Applied the blade offsets and checked that the BF hung as expected. * Found that the yoke was rubbing again and corrected it by putting it at an angle matching the keystone. * Found that the cables were adding too much stiffness and friction and rerouted them. * Found that the GAS was unstable and reduced the compression symmetrically to get 0.37 Hz. * Rebalanced the IM to set the right pitch, yaw and height. * Tested the IM picos. Unfortunately the pitch pico stuck near or at one end of its range and we will need to take the end plate off the IM to find out what is wrong. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
- Hirata-san:
- Made BS disposable wire clamp 3Dmodel and drawings.
- Made ballast mass drawings for BS Bottomfilter and Standardfilter.
- Made parts list and screw list for disposable wire clamp and ballast mass.
- Sent drawings and lists to i-ject for quotation.
- Start to make drawings for SR big parts (optical bench,damper rings,sus wires,cable clamps) - ongoing.
- Mark, Fabian and Enzo (at Kamioka):
- Realized that some of the imbalance in the BF was from the fishing rod and calculated a new set of blade offsets to center the rod but leave the torque from the FR to be cancelled by the trim mass for now.
- Applied the blade offsets and checked that the BF hung as expected.
- Found that the yoke was rubbing again and corrected it by putting it at an angle matching the keystone.
- Found that the cables were adding too much stiffness and friction and rerouted them.
- Found that the GAS was unstable and reduced the compression symmetrically to get 0.37 Hz.
- Rebalanced the IM to set the right pitch, yaw and height.
- Tested the IM picos. Unfortunately the pitch pico stuck near or at one end of its range and we will need to take the end plate off the IM to find out what is wrong.