Mechanical

1

Filter-Wheel-Design Imaging Sky Probe
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• Mechanical
• Design Concept

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2
Design Drivers

• Indexing Time 1 second /-1/4sec
• Positioning Accuracy 150 micron
• Repeatability 50 micron
• Filter Clear Aperture 134 mm
• Fit into given Design Envelope
• Hall Sensor for Home position
• No Detent Due to indexing time requirement

3
Design Envelope
Attachment Bracket Schematic only
14.96
Design and Locations subject to interfacing with
Pan-Starrs Telescope
25.0
25.0
4
Clearance Cutout for Cone-Wheel
Support Bracket
Entrance Baffle
Hall Sensor Substrate Bracket
Optics Bench 1 inch thick Alu plate to be mass
reduced at detail level
5
Drive Train Axis
Cone-Wheel Axis
Support Brackets with mounting locations for
Cone-Wheel and Drive Train Assembly Mass reduce
done at detail level.
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ISP Cone-WheelSupportSubassembly
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5.5inch Dia Filters Weight 0.62 kg Qty 5
Bearing Mount Assembly
Sprocket Gear Purchased
Cone-Wheel Weight 4.0 kg without FiltersMass
reduced for low moment of inertia
Largest Diameter of Cone-Wheel 16.5 inch
DetentMagnet Ring
Filters are mounted kine-matically on a 3-point
support, Filter Clips are pressing onto Filter
from opposite side of supports
8
Preload Ring
16.5 Dia
Angular Contact Bearings Preloaded
X-Section through Cone-Wheel
9
ISP Drive MotorSupportSubassembly
Slotted Belt Tensioning Subplate
Belt-Preload See notes
Smartmotor 3420D
Drive Belt
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Filter Clips Qty3/Filter
With proper tensioning, drive will be backlash
free
Support Bracket
Belt Tension Adjustment Block ¼-28 screw and
Lock nut bolts to Support Bracket
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ISP Lab Setup Picture 1
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ISP Lab Setup Picture 2
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• Summary Comments
• Screw connections have not been modeled except
  where indicating a design feature.
• The Assembly shown in these slides must be
  fitted to the Pan-Starrs Telescope. This is an
  outstanding design task
• The purchased components have been labeled and
  should be ordered as soon as the design has
  reached final stage (prior to detailing)
• I suggest ordering duplicates for the Drive Belt
  24GCF-260-E (Vendor W.M.Berg Inc)
• Consult with Ken Chambers about further weight
  relieving. Extra Weight may not matter.
  (Exception Cone-Wheel) and will speed up time to
  market
• Any Post-Processing (Paint, anodize etc) will
  need to be discussed with Ken
• Do not over-tension the Belt,as it will decrease
  its life span
• The I-DEAS Cad Model is stored in a library
  called vern with Project name
  Imaging_Sky_Probe