- July 5, 2016 at 2:46 pm #14416
I will edit this in the future, and put specifics, but for now, picture.
btw, that xbox logo was burnt at 38mm, power setting 0-22, 4000mm/min (3.8w laser)
* 1/2″ MDF sitting on top of 1×3″ pine on 6.75″ centers
* Removed the backpower diode on the RAMPS board, added a 7805 regulator to provide 5v servo power (ended up not using it)
* Removed all 5 baby capacitors under the Pololu drivers, and soldered leads to 32v 440uF capacitors for the steppers. Now they don’t starve.
* Custom case, slides over the whole assembly, with a 50mm fan holding it together
* Removed the USB Poly fuse on the arduino mega 2560 R3, so the board is never powered by USB.
* desoldered the power connector, re-soldered the hot going to where the polyfuse used to go; so voltage in bypasses the regulator.
* 30-year old AT 350w power supply with 36A of 12v on a single rail. (20a for steppers, with plenty of excess for laser/extruder/heater/fans)
* lots of wire clipping inside to reduce the octopus coming from the back of it.
* Controlled via Marlin, but set to turn on by default. I add an M81 at the end of long runs to power it down when complete.
* 84 oz/in, with 9mm wide GT2 belts, 20t pulleys, and “custom” idler pulleys (this could be a post in its own)
* 100% ABS, at recommended infill settings. Stepper mounts sag a bit, and I plan on redesigning them with considerable reinforcement.
* I stuck with everything being ABS, to absorb the vibration of larger routers better.
* Dremel 200, with “custom” bearings ABEC-7 ZZ’s, shimmed in, and backfilled with fiberglass, for accuracy
* Used for extremely fine detail and finishing (0.15mm milling bits and whatnot)
* Custom mount, holds tight enough for 0.0025mm accuracy.
* Dewalt 660, basic off the shelf setup, with a Hall Effect sensor superglued inside of the head.
* RSC-9400 speed controller, with a servo stuck on the knob (seriously) http://www.thingiverse.com/thing:1635710
* Standalone Arduino Pro Mini dedicated to maintain specific RPMS (controlled via I2C from Marlin) .. Again, specifics could fill a whole post. The way Marlin beats up the timers, PWM from the 2560 is not reliable enough to control a servo.
* TODO. Random brand 1800W variable speed router sitting in a box, still have to crack it open and design a mount. Have not found anything the Dewalt couldn’t tackle yet though.
* 2.8w Diode (Nichia NDB7875 445nm 9mm Laser Diode In a Copper Module With Leads & Glass Lens, from DTR’s Laser Shop)
* 3 Element Glass Lens
* China special driver (A10?)
* 32mm x 32mm x 62mm Aluminum Heatsink (Keeps the laser at room temperature.)
* 2x line lasers for aiming
* Intel PIII Heatsink Fan as the primary cooling fan
* 30mm fan mounted below for smoke evacuation, with an endstop screwed to the bottom of it
* High quality, top of the line random re-used piece of a bed liner cut out as a shield to reduce harmful reflections.
* Custom made mount.. didn’t like any of the existing ones, and I wanted to use the PIII CPU Heatsink fan 🙂
* TODO. Will be a Direct-driven J-head. Have all of the components, just need time to design the mount.
* Custom Gang Box with a 4-pin and 8-pin GX-16 connector. 4-pin has +12v, +5v, GND, D9- (fan), 8-pin has D44 (Laser Enable), D8-(Extruder Heater), A13(THERM0), D18(ZMIN), D11(Servo1),D6(E0 DIR),D5(E0 ENABLE),D4(E0 STEP)
* 5/16″x12″ SS threaded rod, hardened, with a flat ground into the top to lock into the pineapple coupler.
* There are not many parts of Marlin that I have not rewritten. Let’s just say its custom.
* M3 Sxxxx, 0-255 sends PWM to D44, for laser level, 3000-35000 sends I2C command to router speed controller and turns on Dewalt 660 power relay
* M5 turns off DW660 relay and D44 (Laser Enable)
* M10 turns on Vacuum relay
* M11 turns off Vacuum relay
* Added st_synchronize to M3, M5, M10, M11, M106, M107, and a dozen other commands, so they are executed in the proper order… otherwise the laser will just pulse off for a split second while doing a G00, and cut lines while traveling.
* Modified stepper_indirection.h to run X/E0 and Y/E1 in paralell, so each DRV8825 is powering an individual stepper; so I get a full 2A to each stepper faster, so they hit max current quicker, and do not slip.. tried wiring them in series, but with the current going through 2 steppers, 12V is not enough to push 84oz/in steppers to their limits.
* Changed E0 to D6,D5,D4; DRV8825 for the extruder will be mounted on the extruder. (3 data wires, instead of 4 magnet-making power wires.. plus RAMPS only has 5 drivers; no room for a 6th)
**more specifics to come
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