Looking at the pictures, the bottom circuit board appears to be a Raspberry Pi B+.by Evil Monkey - General
Out of curiosity, where do you purchase 0.35 mm drill bits?by Evil Monkey - General
After more time and effort than any sane person should spend on a task, the end stops are finally working for the Armstrong arms. And it ended up being a fairly simple fix. There was a section in tssalo's marlin_main.cpp section, G28, which he had disabled. I reenabled it, then went to the configuration.h section and set the y axis to home to the negative and the x axis home to the positive. Thenby Evil Monkey - Polar Machines, SCARA, Robot Arms
Testing the arm homing function.by Evil Monkey - Polar Machines, SCARA, Robot Arms
What kind of microcontroller are you using?by Evil Monkey - Printing
The bracket for the arm endstops. It will allow the machine to home in roughly the same position used by the standard Morgan setup.by Evil Monkey - Polar Machines, SCARA, Robot Arms
So its probably not bed temperature related unless for some reason the bed is turning itself off during the print. If you are still printing in ABS another solution would be to take some acetone, disolve some ABS filament in it to the point where it is a milky consistency, then use a small paintbrush to apply a thin coat. If the coating is too thick, you'll never get your print off the glassby Evil Monkey - Printing
I finally got around to building the tensioning spring. Now to attach the end stops.by Evil Monkey - Polar Machines, SCARA, Robot Arms
What is the nozzle height for the first layer? It should really be smooshed down, I use a business card to measure the height. If painters tape is unavailable, Elmer's glue work quite well. ABS should really be printed on at least 100C plate for it not to warp.by Evil Monkey - Printing
Have you tried printing on hairspray, glue or blue painters tape?by Evil Monkey - Printing
I saw someone run Solidworks on a Surface Pro once, for what it's worth.by Evil Monkey - General
Have you seen the Sextupteron that Nicholas Seward has been working on. There is a short write up in the last Reprap magazine issue.by Evil Monkey - Developers
That would work great for small motors as well as circuits. Just add magnets. Unless I read it wrong, the refills are only $4.00. I can imagine building a second nozzle and doing this in one print.by Evil Monkey - Polymer Working Group
Print using teardrop shaped armsby Evil Monkey - Polar Machines, SCARA, Robot Arms
While I'm still working out some bugs for the Morgan configuration, it occured to me that it was possible to make the Armstrong arms in such a way that they can not contact each other during start up. I was not able to implement Saurabh Lanje's end stop code, so will have to wait for the complete firmware to be released. The upper arms were machined in a sort of tear drop configuration. Now Iby Evil Monkey - Polar Machines, SCARA, Robot Arms
That is incredible! Does it mention somewhere when it will be available for purchase?by Evil Monkey - Polymer Working Group
Have you adjusted the little potentiometer screw on the stepper motor drivers, and they are not too hot to touch? If they only move in one direction, my experience is that an end stop wire is broken.by Evil Monkey - Reprappers
Did you change anything? Also, are the motors not working at all, or are they just not moving?by Evil Monkey - Reprappers
I listed the gear ratio at 49:1 because in this current configuration, I'm using gears to go from the stepper motors to the main shaft. They drop the overall ratio down a bit. I will definitely check out that file and see where I went off the rails.by Evil Monkey - Polar Machines, SCARA, Robot Arms
Springs. There is still plenty of backlash in the gear train, I simply used springs to preload the gear train and pull it all to one side. There are some pictures farther up the thread of the springs used in the other arm configuration. They are torsion springs wrapped around the shaft that pull each arm back. You can see in the videos how well it works printing small cubes, there is no backlashby Evil Monkey - Polar Machines, SCARA, Robot Arms
Any idea how to calculate the steps per millimeter with a total gear reduction of 49:1, 1.8 degree stepping, and 1/16 microstepping? Was looking at the Morgan M92 setup and I'm not sure where Quentin Harley arrived at his numbers. He's using a 11.78:1 gear ratio. Morgan Startup and Calibrationby Evil Monkey - Polar Machines, SCARA, Robot Arms
I had a few more spare minutes today, so I did some assembly. Now to make some springs.by Evil Monkey - Polar Machines, SCARA, Robot Arms
New gears, first printed to check the fit, then straight off the mill.by Evil Monkey - Polar Machines, SCARA, Robot Arms
In time perhaps. I'm better with the machines than with coding, though I am learning Python at the moment. Lyman released the fifth or so iteration of his desk top filament maker. Very interesting design that I want to build upon and make more compact so that it doesn't take up quite so much of the desk top. So I'm trying to finish this project up, but I will definitely keep the original arms inby Evil Monkey - Polar Machines, SCARA, Robot Arms
Yeah, kind of wish scara's would catch on like delta's did. There would be a lot more development then. Spring loading the geared stepper motors works really well and simplifies things. The morgan configuration adds a bit more complexity to this design, but I just want this printer running so I can move on to other projects.by Evil Monkey - Polar Machines, SCARA, Robot Arms
I commented out that entire section. The printer then heated up to operating temperature, then the y axis swing to the side in the same way and began the print. Its very odd. I mounted the Morgan arms. Once more bearings come in the arms will be complete. I will be able to use the Morgan firmware now, most importantly the endstops and arm leveling.by Evil Monkey - Polar Machines, SCARA, Robot Arms
Using flexible metal, how much Z axis do you anticipate having?by Evil Monkey - Polar Machines, SCARA, Robot Arms
I'm a little behind doing the full write up on that blog, but yes I'm using ttsalo's firmware. The printer is currently in pieces, but I will reassemble it, undefining this section section and report back what occurs.by Evil Monkey - Polar Machines, SCARA, Robot Arms
Here is the first few lines from one of the programs I have been using. Nothing special, just a cube. ; generated by Slic3r 1.1.6 on 2014-08-24 at 18:14:35 ; perimeters extrusion width = 0.50mm ; infill extrusion width = 0.70mm ; solid infill extrusion width = 0.70mm ; top infill extrusion width = 0.70mm ; support material extrusion width = 0.50mm G21 ; set units to millimeters M107 M104 S18by Evil Monkey - Polar Machines, SCARA, Robot Arms