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Anything related to printer controllers not being Duet, RAMPS or Sanguinololu: microprocessors, motor and heater driver circuitry, gEDA/KiCAD issues, soldering tips, etc.
Re: Firmware to drive X-Y galvanometer - 13 years ago
I think if we went with an enlarger lens, we could forgo the F-theta lens. Enlarger lenses are also a flat-field focus, it's simply that it would require software correction - the angle in vs. the angle out is not based on F*theta, it's based on F*tan(theta). Enlarger lenses are anywhere from free to $300-ish, instead of $750-$10k. See here for more optics info on lenses, and lasers in general.by rskelton - Controllers
Re: Firmware to drive X-Y galvanometer - 13 years ago
Viktor, Nice! Where did you happen upon that equpment? I'd be interested to see pictures of the scan head and any accompanying lenses... It's been a while since I've worked around a "professional" SLA machine, and at the time I didn't think to take pictures of the optics. If you do get one of those systems working and reading g-code, you're 95% of the way there. 405 nm diodes are relatively chby rskelton - Controllers
Re: Firmware to drive X-Y galvanometer - 13 years ago
Curse and/or bless you and your powers of coding! With regards to the laser power, galvos are usually made for laser shows, so they can generally handle whatever you can throw at them. A glass mirror needs a decent amount of power to reach it's damage threshold (though similar ranges as compared to UV curing). To get around this, you have the focal length of the laser be somewhat long, and the gaby rskelton - Controllers
Re: Firmware to drive X-Y galvanometer - 13 years ago
I've been looking at similar setups off of ebay as well. After some more digging, I found the ILDA specifications here (PDF link). The "show card" basically looks to be a card with various preprogrammed displays, as well as having breakouts for TTL laser control and interfaces to the galvanometer amplifiers. The ILDA spec shows that four pins, +X, +Y, -X, and -Y could be used to get direct XY cby rskelton - Controllers
Re: Firmware to drive X-Y galvanometer - 13 years ago
Here's a good (real time) video of the SLA process. The laser moves quite fast in comparison with even the fastest delta or cartesian bots. Energy levels for cure are usually around 500 to 3000 mJ/cm^2, depending on wavelength and specifics of the resin - with a spot size of 0.05 mm, that gives an area of 2x10^-5 cm^2, so a 400 mW output laser needs about 0.1 milliseconds over the area to cureby rskelton - Controllers
Firmware to drive X-Y galvanometer - 13 years ago
Hi all, I'm working on an SLA printer, using a laser diode instead of the DLP method that many are using for UV-curable resins. I'd ideally like to use an X-Y laser galvanometer for the setup, instead of putting the laser on a movable platform. With the correct optics, I can get dot sizes near the diffraction limit - even quadrupling that gives a dot size of around .05mm, and that will take agesby rskelton - Controllers
Heated Bed problems (RAMPS 1.4 and Marlin FW) [FIXED] - 14 years ago
So, I recently decided to switch to Marlin firmware as I was getting "bumps" at the edges of the STL facets when using Sprinter. Firmware compiles just fine, and everything seems to work - except for the heated bed. I'm using RepG 0025 (the ultimaker version that works with Marlin), and it can read the heated bed thermistor, but it doesn't turn on at all. I've tried checking my pinouts, etc, andby rskelton - Firmware - mainstream and related support
Wanted: mendel parts in Indiana - 16 years ago
Hey, I'm a senior mechanical engineering student at Purdue University in West Lafayette, IN, and am looking for some Mendel parts. I'm willing to pay for parts/labor/shipping, or a trade for machined parts (as I have access to a full machine shop, manual and CNC machines), or somewhere inbetween. PM or send me a message to rskelton@purby rskelton - Wanted