Grove City College

1
Grove City College
2
The Team
David Anderson David Chapman Jen Chyko Jill
Cunningham
Nick Dean Brendan Flynn Patrick Marr Ben Moyer
3
Project Objectives

• To design a telescope that uses an f/1.9 mirror
  with a 20 inch diameter
• To design a mounting system that will incorporate
  an equatorial axis and accommodate such a large
  telescope.

4
The Design

• Mount Assembly
• Drive Assembly
• Fork Assembly
• Telescope Assembly

5
Telescope Setup

• 5 Axes of rotation
• Initial setup
• 2 Axes
• Telescope adjustment
• 2 Axes
• Celestial tracking
• 1 Axis

6
Rotation Animation
7
Altitude Animation
8
Telescope Rotation
9
Telescope Altitude
10
Polar Axis Tracking
11
Setup Tracking
12
Mount Drive

• 3 Main Components
• Base and Tripod
• Altitude Adjustment
• Gearbox and Drive

13
Tripod Assembly

• Three legs
• Fully collapsible
• Square steel tubing

14
Base Housing

• Steel bar stock
• Two bearings
• Thrust
• Radial
• Stainless steel shaft
• Locking mechanism

15
Altitude Adjustment

• Extruded aluminum
• Stainless steel hinge
• 3/8 Lead screw
• Self-locking

16
Gearbox Drive
17
Drive System
18
Main Drive Worm
19
Follower Worm
20
Secondary Worm
21
Correction Spur Gears
22
Motor
23
Fork Assembly

• Interface between Telescope and Mount
• Control fine adjustment of the telescope
• Operate over the entire range of motion

24
Altitude Assembly

• Interface between telescope and fork casting
• Adjustment mechanisms
• Worm gear that disengages with the worm
• Pinned clutch on the shaft
• Worm gear with course and fine adjustment knobs
• Worm gear with one medium adjustment

25
Rotational Assembly

• Interface between mount and fork casting
• Rotational mechanisms
• Bearings and bearing housing

26
Fork Assembly

• Functional requirements
• Minimize adjustments
• Weight considerations
• Maintain accuracy while tracking

27
Telescope
28
Stage
29
Stage

• Support of Mirror
• Support of Angled Actuators
• Compatible With NASA Stage

30
Stage Re-Design

• Current Problems
• Rigidity Questionable
• Manufacturing Difficulties
• Re-Design Options
• Increase Casting Thickness
• Machine a similar shape
• Use a simplified plate and legs

31
Collar

• Interface with tube
• Retain the stage
• Retain the mirror

32
Detail of Interface
33
Stage/Collar Interface
34
Mirror Retention
35
Optics
36
Conclusion
37

• Thank You!