I'm just guessing from the names here, but doing so they don't seem to be power connections: NC -- Not Connected TDI -- Two wire communications Data In TCK -- Two wire communications ClocK TDO -- Two wire communications Data Out HTH, Reinoutby Reinout Heeck - Controllers
You can find several sets on ebay. R -by Reinout Heeck - Wanted
Great writeup, thanks! An editorial remark: I found the 'output' label in the PLL diagrams confusing. I suggest you either remove it completely or move it such that the VCOout is labeled as the 'output', since that is how it is used in this application. R -by Reinout Heeck - Plastic Extruder Working Group
I had a problem with just one endstop that turned out to be created by the Arduino board. On the Arduino board itself an LED was connected to a pin that happended to be used as an endstop input and the endstop was not able to drive an LED, so insufficient signal was delivered to the microcontroller. I simply swapped two connections, making sure that the pin with that LED connected to it was useby Reinout Heeck - RepRap Host
nophead Wrote: ------------------------------------------------------- > I have seen Makerbot users report that if they try > to extrude too soon the extruder jams. Ah, good to know, I lived under the impression they mainly had problems after idling the extruder a while at operating temperature. > No the melt chamber is actually far too big in my > opinion. The shorter it is the fasby Reinout Heeck - Controllers
> A time constant is exactly what is says. It is > constant, regardless of the temperature swing. Yep, that's why I used the term delay, admittedly a bit vague/sloppy. > When the heater design moved to using Kapton the > warm up time went over 100 seconds to tens of > seconds. Good to know (I still 'bake' heaters with fire cement), saw no reason to move away from doing that. &gby Reinout Heeck - Controllers
I can't help you with the official software since it does not fit on my device. I'm running an older version of the firmware that I hacked a bit to keep it compatible with the current host softwares. So I'm still using the three-level bang-bang control which works well enough on my machine although it clearly gives rather course results (but not the +20C you mention, more like 5C over here).by Reinout Heeck - Controllers
> Glass bead thermistors have a time constant of > several seconds. Only when taken between extreme temperatures, when I calibrated my thermistor table the delay was not discernible. Furthermore I think the major time delay is temperature propagation from the heater to the thermistor, not so much in the thermistor itself. But then my thermistor is burried deeply in the heater barrel (excelby Reinout Heeck - Controllers
De RepRap is eigenlijk alleen maar een set bouwtekeningen en instructies, er gaat *veel* tijd in zitten om alles bij elkaar te zoeken en passend te maken als het 'net effe anders' is dan in het originele ontwerp, voor sommige onderdelen is een draaibank nodig (tenzij je ze kant-en-klaar bestelt). Ik weet niet waar je woont, maar misschien is het een goed idee om mee te doen met de 'RepRap Masterby Reinout Heeck - Dutch User Group - Archive
here's an odd train of thought I had, don't whether it is feasable, but it seems lo-tech enough: 1) The simplest DIY multi-kilowatt lamp I know is an open-air arc lamp (typically built from two carbon rods + a simple welding transformer). The output of such a lamp is hard UV (cover your eyes and your skin! protect your neighbours too!). 2) you cannot use lenses to focus the light since glass abby Reinout Heeck - General
Ah, this is a nice opportunity to point to a nano scale cartesian bot design I fell in love with. See the 'Disk Scanner' links here: http://www.geocities.com/spm_stm/Project.html R -by Reinout Heeck - General
> bTW what is missing in the diagram is the common > ground.. > > So for everyone thinking about to make this.. > attach the 2 - .. Yup, this is hardly ever drawn explicitly in circuit diagrams. When you see ground symbols they are all connected. Ditto for power symbols, when you see multiple +5V power symbols they would be connected to each other too. > > I hope thisby Reinout Heeck - Controllers
Great hacking! Brings back old memories... The formula you need is called 'Ohms law' V=I*R (tension in Volts = current in Amps * resistance in Ohms) So assuming a 12V power supply you would get: Old situation: 12V = I * 10 Ohm ==> I = 1.2A New situation: 12V = I * 6 Ohm ==> I = 2A. So the relay contacts should be able to handle 2 Amps, and your power supply should be able to handby Reinout Heeck - Controllers
Great! does it stop heating when at temperature now?by Reinout Heeck - Controllers
Ouch... this is going to be very hard to debug via email/messageboard. Your best bet it to pair up with someone who has some measurement equipment (and knowledge) available in order to home in to the source of the problem quickly. Perhaps there is a HackerSpace near you, or a college where you can ask a teacher to hook you up with an electronics enthusiast. There are various ways the symptomsby Reinout Heeck - Controllers
I was going to point you to the documentation on the wiki: http://reprap.org/wiki/Generation_3_Electronics/Tech_Zone_Remix but when I started to read the attached files I realized they are *very* cryptically documented. Particularly the pinouts of the main board are a 'deep' puzzle with some connections even named after the AtMega pins instead of their function. Going to the standard Gen3 pagby Reinout Heeck - Controllers
When you export your design as STL for processing by Skeinforge you are using a very primitive format: just triangles describing the faces of the object, with a convention dictating which side of the triangle is inside. To answer your first qustion: it should not matter how you define your objects at a higher level, the design software 'renders' the faces to triangles regardless of the way you dby Reinout Heeck - Skeinforge
Mike, Viktor, thanks a lot for those great links :-) I'll delve into them over the weekend, R -by Reinout Heeck - Controllers
Mike, the motivation to do 'nano stepping' is to make the motors run smoothly when they are stepping very slowly, so my PlyRap stops shaking itself loose. My intent is to have the G-code interpreter drive the machine at a granularity of either half or whole steps as the DDA does now, but that my new DDA will smoothen the transitions between these steps. I envision that such a scheme will make mby Reinout Heeck - Controllers
I recently purchased 20 H-bridges from here: http://cgi.ebay.nl/TLE5206-2GP-H-BRIDGE-5A-DC-MOTOR-PDSO-20-QTY-2_W0QQitemZ170433281344QQcmdZViewItemQQptZLH_DefaultDomain_212?hash=item27ae9d7d40#ht_1118wt_810 The idea was to not implement microstepping but go way further (nanostepping?) using PWM on one half of each bridge. I haven't done any experiments with them yet so I cannot tell you much moby Reinout Heeck - Controllers
I suggest you try to feel whether this is a mechanical problem or an electrical one: disconnect the stepper from the electronics. Also make sure that the wires of the stepper are not touching each other or the motor housing (else electrical braking will confuse you). Then turn the axis manually for several revolutions in both directions and feel whether it rotates freely. If it locks up you havby Reinout Heeck - General
Also I would expect a lot of trouble with suppressing waves in the basin...by Reinout Heeck - Mechanics
As I read it two ideas seem to be mixed, one of magnetic forces which would suggest a linear motor to me (search for 'planar motor' to find 2d linear motors) the other seems to have to do with forces created by electrical current through the solution. See here for some related experiments (do note the 500 - 7000 amps of current used): .by Reinout Heeck - Mechanics
wouldn't it be a lot easier with a mosfet? Depends on what you have laying around ;-) The big advantage of using a mosfet is that you can use PWM for precise power control.by Reinout Heeck - Controllers
Here's a more comprehensible version of the schematic. I did add one rather essential part though: a diode (parallel to the relay coil) which protects the transistor from flyback currents. See attachment. Success!by Reinout Heeck - Controllers
You could try to eliminate the 6 PCBs for the opto endstops by moving their electronics to your board - another (small) costs saving.by Reinout Heeck - Controllers
Request: add a fuse to the 5v supply. The first time I fired up my electronics I evaporated a track off one of my motor driver boards. It turned out one of my endstop boards was poorly soldered - 0 and 5v were shorted out. A fuse would have saved me from the dismantling and repair work on the motor board (not to mention the acrid smell in my room :-)by Reinout Heeck - Controllers
I didn't have enough pins to support a heated platform. To do that you would have sacrifice two of the max sensors. One thought I had a while ago is that every axis only needs one end sensor to be active at a time - depending on the direction it is moving in. So we could multiplex two sensors into one pin using the DIR signal to switch between the sensors. This means that if you add somethingby Reinout Heeck - Controllers