pxl mechanical hinge rework in aluminum and carriage redesign kinematic rework and analysis...
TRANSCRIPT
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PXL Mechanical
• Hinge rework in aluminum and carriage redesign
• Kinematic rework and analysis• Insertion test - detailing and fabrication
instructions• Spatial Calibration
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New carriage design
Low mass, reduced space usage
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Test of cable load support
Analysis in seconds
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Hinge structure in aluminum, improved stability. Low mass, 2 mm thick - stable. Expanded air duct passage.
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Cam guide FEE check20 lb load, 20 micron deflection, yield – no problem
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Kinematic mounts, cock and lock spring loaded contacts to define detector location when inserted
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Kinematic Mounts
Insertion and Retraction Forces
May 11, 2010
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Joseph Silber
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Behavior to model
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Offset, Radii
• Horizontal offset makes manual analysis of design difficult.
• R1 ≠ R2 contributes further to this.
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Further considerations• Constraint surfaces are not C1 continuous, so contact
conditions require some additional searching logic, and discontinuities in calculated forces are expected.
• The combined assembly consists of two “top” mounts and one “bottom”. These effects must be calculated in phase with each other for summing up the forces.
• Total insertion and retraction force differ in magnitude, due to non-conservative friction forces.
• Friction forces differ depending on static versus dynamic.
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Status
• We now have a general code for analyzing kinematic constraints of arbitrary piecewise complexity.
• Now use code to optimize the design.
• Analysis of current design shows potential gains in:– smoothing the insertion and retraction force curves– eliminating the negative force condition (“suck-in”)– simplifying the offset and radius conditions of contacts
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rail test system
rail_test_system.SLDASM
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5/3/2010this document: http://www-rnc.lbl.gov/~wieman/Rail_test_system.pptxmodels: http://www-rnc.lbl.gov/~wieman/rail_test_system_05_03_10.zip
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part/file cnfg material source total#
p. ref
grf
1 PIT_glue_plate_to_rail_hanger_free.SLDPRT 6061 UTA 16
2 PIT_end_fixture.SLDPRT PIT east end MIC6 LBNL/UTA? 1
3 PIT_end_fixture.SLDPRT PIT west end MIC6 LBNL/UTA? 1
4 PIT_end_fixture.SLDPRT PST east end MIC6 LBNL/UTA? 1 later
5 PIT_end_fixture.SLDPRT PST west end
MIC6 LBNL/UTA? 1 later
6 Tooling ball MC 8481A34 steel MC 36
7 tee_nut_custom_half_in_slot.SLDPRT 6061 UTA 6
8 PIT_base_fixture.SLDPRT PIT MIC6 LBNL/UTA? 1
9 PIT_base_fixture.SLDPRT PST MIC6 LBNL/UTA? 1 later
10 PIT_fixture_flex_lever.SLDPRT 6061 UTA 4
11 PIT_hole_fixture_end_addapter.SLDPRT 6061 UTA 1 later
12 PIT_hole_fixture_end_addapter_mirrored.SLDPRT 6061 UTA 1 later
13 dowel pin 0.125 X .375 in, MC 98381A470 steel MC 4 later
14 PIT_hole_fixture_beam.SLDPRT 6061 UTA 1 later
parts list for assembly: rail_test_system.SLDASM
example
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this plane perpendicularto a ref cylinder axis
line betweenholes centered onref cylinder axis to ±0.05 mm
separation tolerance±0.05 mm or match drilledwith butch_plate_single.SLDPRT
diameter tolerance:+0.000 mm-0.005 mmfor bullet insert press fit
this and other 2 similar planestolerances to chord and axisof ref cylinder: ±0.05 mm
±0.05 mm tolerances are to preserve glue bond thicknesses
these and other similar holesdiameter tolerance:±0.005 mmfor press fit with tooling balls,glue in OK if ends up sloppy
grand_master.SLDPRT
Example tolerance spec
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development of spatial mapBob ConnorsSpiros MargetisYifei Zhang
touch probe 2-3 m (xyz) andvisual 2-3 m (xy) 50 m (z)
active volume: huge
10 gm touchprobe force
visual sub micron (xyz) repeatability 5 m accuracy over active volume
no touch probe
active volume: 30 in X 30 in X 12 in
MEMOSTAR3, 30 m pitch
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Visualization of touch probe data in solid works
Coordinate Measuring Machine gives touch probe ball location plus a unit vector in the direction of the touch force. This figure shows ball location plus ball radius times unit vector.
Michal and Xiangming have developed code for putting coordinate machine data into more convenient form