Direct write laser exposure system

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An affordable direct write photolithography system for mask creation.

This device will be based on the following abstract.

http://bit.ly/Z3uNen

There is much room for improvement on this design both in cost and performance. Here are some design considerations.

Linear XY Stage
Stage: Laser cut 23mm thick acrylic
Motors: NEMA 14 Bipolar Stepper, 400 steps/rev ($12 stepperonline.com)
Leadscrews: .5mm pitch M3 ($8/meter mcmaster)
Nuts: M3 hexnut ($2.50/ 50 pack mcmaster)
Antibacklash spring integrated into stages
Bushings: LM3UU for guide rod ($3 Ebay)
Bearings: 3x3x3mm for threaded rod ($3 Ebay)

Coupler: 3mm to 5mm (couples threaded rod to stepper shaft)($4 Ebay)

Microscope
Eyepiece: WF10 ($15 Ebay)
Objective: 100x Achromatic ($40 Ebay)
Barrel: 170mm long 24mm diameter 2mm thick black pvc pipe ($3 lowes)
Imaging: Logitech C270 720p Webcam ($15 Ebay)

Great resource on simple compound microscope construction.
http://www.funsci.com/fun3_en/ucomp1/ucomp1.htm

Motion Control
Computer: Micro ATX, G1610, 4GB DDR3, 40GB SSD ($150)
Software: Ubuntu 12.04 + Xenomai Kernel, LinuxCNC (Free)
Steppers: Closed loop direct drive from parallel port using HAL to L298 powerstages ($8 Ebay)
Rotary Encoders: Optical, model not determined
Linear Encoders: Michealson Interferometer

This page is a work in progress.

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