Oct 17, 2001 SALT PFIS Preliminary Design Review 1

Southern African Large Telescope Prime Focus Imaging Spectrograph

Mechanical Mechanism Design

Michael Smith

University of Wisconsin - Madison

Oct 17, 2001 SALT PFIS Preliminary Design Review 2

Introduction

• Mechanism Preliminary DesignCollimator Mechanisms

Camera Mechanisms

Articulation

• Packaging• Lifting and Handling

Oct 17, 2001 SALT PFIS Preliminary Design Review 3

Overview

Focus mechanism

Filter Mechanism

Camera Tube

Slit mask mechanism

Wave plate mechanism

Mirror mechanism

Shutter Mechanism

Etalon Mechanisms

Grating mechanism

Near IR

Visible Beam

Collimator Lens Holder

Oct 17, 2001 SALT PFIS Preliminary Design Review 4

Slit Mask Mechanism

Focal plane structure

First group lens mounting

Horizontal Carrier

Vertical CarrierMagazine

Rack

Collimator

Wave Plates

Focal Plane

CameraCCD

Slit Masks

Mirror

Oct 17, 2001 SALT PFIS Preliminary Design Review 5

Slit Mask MechanismSlit masks

Rack with engaging tooth

Stepper Motor & pinion

Oct 17, 2001 SALT PFIS Preliminary Design Review 6

Wave Plate Mechanism

Oct 17, 2001 SALT PFIS Preliminary Design Review 7

Wave Plate Mechanism

Rotational Motor

Linear Slide

Wave plate in stacked arrangement Slim

Section BearingsSpur Gear

Pinion

Optical axis

Oct 17, 2001 SALT PFIS Preliminary Design Review 8

Mirror Mechanism

Motor - Linear actuationBeam location

( Z-axis)

Base Plate

Trunion

Linear slide rails

Oct 17, 2001 SALT PFIS Preliminary Design Review 9

Camera Assembly

Focus mechanism

Filter Mechanism

CCD Camera with electronics

Shutter Mechanism

Etalon Mechanisms

Grating mechanism

Near IR

Light entry

Articulation Bearing Articulation Drive

Oct 17, 2001 SALT PFIS Preliminary Design Review 10

Focus Mechanism

Lensholder Aerotech slide

ATS0300 Series

Collimator

Focal Plane

CameraCCD

Focus

Oct 17, 2001 SALT PFIS Preliminary Design Review 11

Shutter MechanismAperture 162mm

Solenoid/Pneumatic Cylinder

Collimator

Focal Plane

CameraCCD

Shutter

Oct 17, 2001 SALT PFIS Preliminary Design Review 12

Etalon Mechanism

Linear slide

Etalon holder

Slide Base plate

Pneumatic Cylinder Actuation

Collimator

Focal Plane

CameraCCD

Etalons

Oct 17, 2001 SALT PFIS Preliminary Design Review 13

VPH Grating Mechanism

Grating in the beam

Camera Structure

Grating housing

Spring loaded set screw

Rotational Stage (Newport)

VPHSpectroscopy

CCD

Grating

Oct 17, 2001 SALT PFIS Preliminary Design Review 14

Polarizer Mechanism

Polarizer in frame

Worm and worm gear

Support mounting on camera structure

Motor

Collimator

Focal Plane

CameraCCD

Polarizer

Oct 17, 2001 SALT PFIS Preliminary Design Review 15

Filter Mechanism

Base plate for carrier

Magazine

Motion of filter from magazine to carrier to holder

Carrier

Filter Holder

Motion of Carrier

Collimator

Focal Plane

CameraCCD

Filter

Oct 17, 2001 SALT PFIS Preliminary Design Review 16

Articulation Mechanism

Roller Pinion mates with gear on I beam

Camera Tube

Motor

I Beam with gear cut on top flange

Bottom rollers with flexure

Camera Articulates 0-90 degrees

Oct 17, 2001 SALT PFIS Preliminary Design Review 17

Packaging

• Optical and mechanism sub-assemblies removable and packed in hard, padded, air-tight containers.

• Frame structure packed in custom made crate.

• Same container for transport and storage for swap-out items like etalons.

• Instrument designed to facilitate easy dismantling, packing and reassembly.

• On-site verification of optical alignment after reassembly.

Oct 17, 2001 SALT PFIS Preliminary Design Review 18

Lifting & Handling

2500mm

700mm

1400 x 1400 Separator

Frame

12 Fixture Points