So I started thinking about the endstop problem I was having while using the teacup firmware. I had wired my endstops to be normally open, when everyone else... on the planet... wired theirs to be normally closed. a G28 would send whatever axis away from the minimum (the second part of homing), and when I closed the switch would stop because it looked like it finally got away from the minimum. Then I found this mechanical endstop schematic, and I wondered if maybe I had a tiny stroke last year... at 28. It seems I couldn't connect anything properly.
And I found the speed issue I had yesterday was because MAXIMUM_FEEDRATE_E was set too low. Here is the now more... sensible diff.
Sunday, July 24, 2011
Saturday, July 23, 2011
July 2011 Updates
I found that the firmware I had been using would require too much work going forward and I started a switch to using the Teacup Firmware. Here's a diff of the changes I made. I mostly made some small changes to my hardware to match closer to the firmware standard. It seems to work great, except for a few middling things I still have to figure out, speeds are off. This also means that I can switch to other host software and I'm presently using the 0025 release of Replicatorg. Reprap Host worked well enough, but I can debug a lot easier with Replicatorg and it has included Skeinforge for a while. Skeinforge is the one thing I don't think I'm changing anytime soon. I also found in the course of this updating that I'm terrible at electronic design... well I suppose I'm better than I was... because I found the problems. I was terrible, I'm somewhat better now. I had wired my heated bed in silly way, sharing the 5v- with the 12v+, the resistors were wired in two parallel sets of series resistors, which is now completely in series 12+ and 12-. I also had added a 5v line to each of the minimum limit sensors... unnecessary with physical switches. I cleaned up some wiring and fixed the pwm board to add some diodes and change out a transistor.
Earlier in the month I bought a groove mount thermal barrier from makergear.com, which I found is based just about 30 minutes north of here... cool shit, on both points. I don't see any reason why to use any other design for a thermal barrier for a while. It's a great design and having tried it with PLA and ABS. It works, and works well... I'm buying 10 once I have some money.
Earlier in the month I bought a groove mount thermal barrier from makergear.com, which I found is based just about 30 minutes north of here... cool shit, on both points. I don't see any reason why to use any other design for a thermal barrier for a while. It's a great design and having tried it with PLA and ABS. It works, and works well... I'm buying 10 once I have some money.
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