Engraver by bngreen

Last crawled date: 3 years, 1 month ago

This is a machine for creating printed circuit boards. It works by shooting an UV laser to a photosensitive film applied to the copper clad board.
Parts needed (links just for reference):
2x nema 17 steppers
4x 8mm diameter rods
8x 8mm bushing (https://www.aliexpress.com/item/10pcs-SF-1-0810-Self-Lubricating-Composite-Bearing-Bushing-Sleeve-8-10-10mm/1393921440.html)
1x PC case(or wooden box)
2x M5 threaded rods
8x M5 nuts
2x stepper motor coupler (http://www.ebay.com/itm/5x5mm-CNC-Motor-Jaw-Shaft-Coupler-5mm-To-5mm-Flexible-Coupling-OD-19x25mm-LU-/162331234217?var=&hash=item25cbb20fa9:m:m3W6cN0V5fJUprqoNVIGbfw)
20x M3 screws and nuts
1x 50mW+ UV laser (http://www.ebay.com/itm/New-Metal-Laser-Diode-LD-SLD3232VF-Fit-For-SONY-405nm-50mw-CW-Violet-Blue-1PC-/232136388708?hash=item360c683064:g:sj8AAOSwB09YIEZg)
1x laser housing (http://www.ebay.com/itm/2pcs-12x40mm-Metal-Housing-Case-for-5-6mm-TO-18-Laser-Diode-w-200nm-1100nm-Lens-/252086841192?hash=item3ab18bef68:g:mbwAAOSw4SlV8R~r)
1x laser heatsink (http://www.ebay.com/itm/Promotion-Special-Offer-Cooling-Heatsink-Heat-Sink-for-12mm-Laser-Diode-Module-/231319696413?hash=item35dbba741d:g:LggAAOSwEK9UAJH8)
4x MR95ZZ bearings
2x springs, ID: 6mm, length: 10mm
2x a4988 (or DRV8825) stepper drivers
2x a4988 extension board (http://www.ebay.com/itm/A4988-DRV8825-3D-Printer-Stepper-Motor-Driver-Control-Extension-Boards-/321746391773?hash=item4ae99452dd:g:KI8AAOSwBLlVSJB3) [optional]
1x STM32F103C8T6 development board (http://www.ebay.com/itm/ARM-Cortex-M3-STM32F103C8T6-STM32-Minimum-System-Development-Board-/381374722304?hash=item58cbb47100:g:S0cAAOxyni9S~0Fd)
1x laser driver or current limiter
1x transistor or mosfet for laser PWM
Firmware: https://github.com/bngreen/Engraver-Firmware
Host Application: https://github.com/bngreen/Engraver-Host
Electronics: https://circuitmaker.com/Projects/Details/Bruno-Green/Engraver [untested]
Instructions coming soon
Safety Concerns
Always wear appropriate (wavelength and OD rating) safety glasses rated for the wavelength of your laser, even 5mW lasers can be dangerous to your eyes.Driving the laser with PWM and low duty rate does NOT makes it safe to be looked at with naked eyesBe careful with reflective surfaces, most of the goggles does not protects you from laser reflections. Do not point the laser to your eyes (or of others) even with the safety glasses.