3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
3D Printing Opto-Mechanics
David J. Starling Mari MagaboJoseph Ranalli Kenneth Dudeck
Penn State HazletonJanuary 12, 2015
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
Introduction
Can we replace high-cost computerized optomechanicaldevices with custom 3D printed parts?
Yes!
I What are opto-mechanics?
I 3D drawings
I Arduino control
I Results
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
What are opto-mechanics?
Optomechanical parts are mechanical devices used tocontrol optical systems.
(source: www.thorlabs.com)
Examples:
I Mirror mounts
I Translation stages
I Rotation mounts
I Fiber aligners
I Rail and cage mounts
I Pedestals and Posts
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
What are opto-mechanics?
Rotation mounts are used primarily with polarizers, quarter-and half-wave plates.
2
1
BiBO
BBO F
A1
A2
F
Laser
(Physical Review A 84, 032305 (2011))
I Polarimetry
I Tests of quantum mech.
I Violate a classical
inequality- 20 - 10 0 10 20
0
1
1.5
2
2.5
°
MJ C
Waveplate Angle ( )
0.5
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
What are opto-mechanics?
The problem? The cost...
I 4-axis Controller: $6,563
I 4 drive modules: $2,456
I 4 Rotation Stages: $6,000
I Total: $15,019
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
3D drawings
We want to create a comparable device to Newport’sPR50PP rotation stage.
I 10 N load
I Minimum angular
motion: 0.02◦
I 360◦ angular range
(18,000 steps)
I Maximum speed: 20◦/s
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
3D drawings
We use a low-cost stepper motor for control.
HF GEDCB
1
2
3
5
4
6
1
2
3
5
4
HF GEDCBA
6
FORM-ENG-07
CONTROL SIGNATURE:
COPY
RIGH
TTH
EINF
ORMA
TION
CONT
AINED
INTH
ISDR
AWIN
GIS
CONF
IDEN
TIAL.
SCALE UNIT
SIZE
DRAWN XUHEZHAO
CHECKED
APPROVEDFINISH
MATERIAL
UNSPECIFIED TOLERANCE:
TITLE
SHEET
DWG.NO.
OF REV A1 1
2 009 03 07
m m
A 4
A 1ST ISSUEREV. EPO# DETAILS DATE
090327
MERCURY MOTOR
42.3Max
31 0.1
1200
2
AWG26软线
深4.5mm
4-M3
34Max
42.3Max
31
0.1
A
C
B D
RED
GRN
YUL BLU
STEP ANGLE 1.8° 5% VOLTAGE 12V
PHASES 2 CURRENT 0.33A
INSULATION RESISTANCE 100Mohm(500V DC) INDUCTANCE 46 20% Mh
CLASS OF INSULATION B RESISTANCE 34 10%
WEIGHT 0.20Kg HOLDING TORQUE 0.23N.M
COMMON RATEING SPECIVICATIONS
SM-42BYG011-25-090327
SM-42BYG011-25
WIRING DIAGRAM
(ROB-09238 at sparkfun.com)
I $15
I Bipolar Motor
I 200 steps/rev, 800 µsteps/rev
I Holding torque: 0.23 N-m
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
3D drawings
We chose to use a 20:1 ratio worm drive system to couplethe stepper to the optic mount.
(from wikipedia.org)
This results in 16,000 microsteps per revolution, or 0.023◦
of resolution.
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
3D drawings
Each part was drawn in Solid Works, exported to STL,sliced with slic3r and 3D printed using pronterface.
The worm is printed in two parts and glued together.
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
3D drawings
The end product consists of 4 main parts: the optic holder,the main body, the worm and a stabilizing box.
The worm is held against the worm gear with a springattached to the stabilizing box.
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
Arduino control
We use an Arduino Duemilanove with an ATmega168 ($11)with an EasyDriver Stepper Motor Driver ($15).
I Cost for arduino, drivers and motors: $131
I Cost for PLA: $19
I Savings: $14,850 or 99%.
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
Arduino control
The arduino listens on the USB serial port for commandsfrom the PC.
Commands are sent using python to control the waveplateangle.
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
Results
We test the rotation control using laser intensitymeasurements through crossed polarizers.
The data should follow a I(θ) = I0 cos2(θ) curve.
3D PrintingOpto-Mechanics
What areopto-mechanics?
3D drawings
Arduino control
Results
Results
We can 3D print and electronically control a rotation mount
(a) good for optics measurements
(b) 99% savings
(c) customizable size, shape, mounting
(d) great undergrad project!
Contact Information:
I David J. Starling
I email: [email protected]
I website: www.david-starling.com