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Rostock, Kossel, Simpson, 3DR, and more. See: http://reprap.org/wiki/Category:Delta. Previously named "Delta Robots and Stewart Platform"
Re: Precision Piezo Z-probe Now available. - 8 years ago
Quotewhosrdaddy Why not bond the piezos to the bed? no drilling, less hassle I think the only reason this approach was thought to be less than ideal, was that the piezos are affected by heat. It turns out not as much as we first thought. So I'd be keen to hear who has tried this, how hot do you run the bed, are you tuning with the bed fully heated, how sensitive is the system?by DjDemonD - General
Re: Precision Piezo Z-probe Now available. - 8 years ago
Murata make 12mm Piezos we have used before. If you are going to noise cancel the question is where should I put the other three piezos? But adding an extra one, or slightly amplifying one will probably help. If the machine is not very mechanically noisy you might not need any noise cancelling.by DjDemonD - General
Re: Precision Piezo Z-probe Now available. - 8 years ago
Looks good great range and dev. Here a useful stl a mount to fit a universal kit pcb to a Piezo20 unit.by DjDemonD - General
Re: DemonDeltaTube - A delta inside an acrylic tube... Build - 8 years ago
So wired up the bed, and placed connectors for the bed heater and pt1000 sensor. Only had one pair of Anderson powerpole connectors so used some tamiya rc car crimp connectors. Now the bed can be disconnected if using the machine open at the base. They are meant to be good for 10amps and its a 250w bed at 24v so might need replacing at some point. They are rated for 15A which is plenty. Havenby DjDemonD - Delta Machines
Re: Kossel XL bending correction problems - 8 years ago
Someone wrote this excellent guide.by DjDemonD - Delta Machines
Re: Precision Piezo Z-probe Now available. - 8 years ago
QuoteChowa Simon As I understand the second piezo is mounted to the carriage to act as a noise source(microphone) for the main signal and is 180 out of phase with the sensor signal thus providing a noise cancelling function.and it is not mounted touching the actual build plate? Stef Yes you need a second piezo (or Piezos if you have multiple sensor piezos) bond them to the carriage if using unby DjDemonD - General
Re: Kossel XL bending correction problems - 8 years ago
Whilst manually calibrating a delta can be rewarding and does improve your understanding of how they work, it is much easier to use the "least squares method" Input your starting values, chose repetier (I think thats a repetier config you are showing us above). Then probe and enter the probe points at the exact coordinates suggested by the calibraton routine. Then change the values and see iby DjDemonD - Delta Machines
Re: Precision Piezo Z-probe Now available. - 8 years ago
Hi Stef, Just to be clear you don't want to place both Piezos as the sensor so putting two back to back into a bed mount will generate little/no noise but also no signal. As the piezo facing one way cancels the piezo facing the other way. Take one of the Piezos out of the mount and just bond it to the carriage nearby facing one way up, leave the other in the mount facing the other way. Now try iby DjDemonD - General
Re: Precision Piezo Z-probe Now available. - 8 years ago
Keen to hear how you get on, this might widen the scope quite a bit. On my corexy underbed, I am concerned since the bed moves in Z that its not just the noise but the inertia of the bed itself as the bed moves up to contact the nozzle, which pushes down on the underbed piezos, so noise-cancelling might not work but I will test it. I tried very low acceleration (and 0 jerk for Z during probing) wby DjDemonD - General
Re: For Anyone Who's Blindly Followed the I3 Design. - 8 years ago
Nice looking machine, minimalistic, very atmospheric photography. Do you think it will be stiff enough?by DjDemonD - General
Re: Precision Piezo Z-probe Now available. - 8 years ago
I can certainly try it in series, I'm going to attempt further validation of this technique on my corexy, where a setup with underbed piezos just did not work despite much effort at the time. What do you see as the benefit of doing so? It was easy to implement as there is only one direction in which the noise needs to be eliminated (vertically since it is irrelevant laterally) and the noise mustby DjDemonD - General
Re: DemonDeltaTube - A delta inside an acrylic tube... Build - 8 years ago
Yes I think that's the answer get the magnet as close to the ball stud as possible without it touching.by DjDemonD - Delta Machines
Re: DemonDeltaTube - A delta inside an acrylic tube... Build - 8 years ago
Decided to go with Titan Bowden for now. As I have a titan extruder and Capricorn Tubing. Extruder bracket is bonded to a printed block and then to the cylinder. One good thing about acrylic is you can stick stuff to it. Gave it a quick test, and filament came out of the nozzle. Umbilical cable is now quite stiff, and magnets are disconnecting a bit. But I am going to make new rods, and willby DjDemonD - Delta Machines
Re: Precision Piezo Z-probe Now available. - 8 years ago
Okay so over in the delta forum section I have been building a delta in a cylinder with screw driven tower axes . It's a bit of a noisy machine mechanically, so when I tried to do some probing using the Piezo20 unit I integrated into this new effector I was getting a lot of false triggers even when trying to lower the sensitivity as much as possible. So Olampe suggested, quite brilliantly, why nby DjDemonD - General
Re: DemonDeltaTube - A delta inside an acrylic tube... Build - 8 years ago
Dear Olampe - you sir are a bloody geniusby DjDemonD - Delta Machines
Re: DemonDeltaTube - A delta inside an acrylic tube... Build - 8 years ago
Thats actually a great idea. If I bond a piezo to the cylinder then wire it in parallel (but reversed polarity) to the one in the sensor it should flter the noise. I don't know if it will work, but a fantastic idea thank you.by DjDemonD - Delta Machines
Re: DemonDeltaTube - A delta inside an acrylic tube... Build - 8 years ago
So a bit more progress. Got my bed drilled a 3mm hole directly into the side of it - drill it straight yeah: Then inserted the sample of the new Precision Piezo PT1000 sensor cartridge in there, coated it in thermal compound, secured it to the wires from the Keenovo 250w 24v silicone bed heater which is now bonded to the underside of the bed: Then (rather roughly as it was difficult to cut)by DjDemonD - Delta Machines
Re: Printer fire hazard - 8 years ago
Perhaps consider one of these fireball systems which burst when heated and hang it in the cabinet.by DjDemonD - General
Re: DC Barrel Jacks - 8 years ago
I used these on my lipo powered microdelta machine, very good connectors. Nothing to stop people reversing the polarity though except on being black and one being red.by DjDemonD - General
Re: Kossel custom build problems with Z axis - 8 years ago
Flying extruder is worth it. Reducing bowden to 20cm basically returns performance to direct extruder levels. But you have to print a little slower as the inertia of the flying extruder will show as added ringing to some degree. Idler and drive pulleys should be the same diameter. Twist your belt that goes over the idler so it runs smooth side to the idler unless the idler is toothed. Using 16tby DjDemonD - Delta Machines
Re: Haydns printed Mag Rods improved - 8 years ago
Will try it with petg I think. Need to make another set for use in chamber bit concerned the pla ones will soften.by DjDemonD - Delta Machines
Re: Kossel custom build problems with Z axis - 8 years ago
Hmm mine were not that tight at all.by DjDemonD - Delta Machines
Re: Delta sizing? - 8 years ago
It's a nice idea swapping on shorter rods, if you coupled that with a multi zone bed you could almost have a lower energy daily drive config and a higher energy max config.by DjDemonD - Delta Machines
Re: Cheap and easy high performance self-made bushing alternative - 8 years ago
I like the creativity and ingenuity of this approach. But my experience over now 4 machines is that so called chiwin rails which can be had for $15 a piece outperform all rod systems whatever bearings/bushings you use. What do you estimate are the costs of your system? I swapped rods for rails on my corexy and saw a noticeable jump in print quality. Genuine Japanese or German rails must be evenby DjDemonD - General
Re: Delta sizing? - 8 years ago
In this thread Haydn claims he can swap longer to shorter rods and print without recalibrating. I've always seen the 20-60 degrees as guidelines. As using magnetic arms and linear rails the effector stays level even at extreme arm angles. I agree you don't want to print at the edges as it is inefficient due to needing high carriage speed, but the with good motors and 32bit controllers high carby DjDemonD - Delta Machines
Re: Kossel custom build problems with Z axis - 8 years ago
Hi guys please read this thread: The issue was not all ball studs were exactly the same size. I do need to correct a couple of things though... 1) we could not accurately determine if they were spherical, if you know how to do this let me know 2) it seemed that whilst there was a spread of sizes of ball stud, when I measured them (as best I could) and my rods and then reassembled my kossel XLby DjDemonD - Delta Machines
Re: DIY Kossel XL prints too small... And flying extruder question - 8 years ago
Me too but I will adjust the rod length in M558 if the scaling is off and I use 8 factor as I want the bed tilt compensated for also. I've tried using the scaling factor Mcode but it did not produce correctly sized parts when I tried it, and kept my rod length to the actual measured length.by DjDemonD - Delta Machines
Re: effector leveling - 8 years ago
QuoteCobalt Griffon Have you tried running through the Esher 3D Delta Calibration wizard? I use it all the time and it's perfectly flat every time. I've written up a usage guide here on my Blog. Great guide you should get David to link to it from the calibration wizard page.by DjDemonD - Delta Machines
Re: DIY Kossel XL prints too small... And flying extruder question - 8 years ago
Work out the amount parts are too small, if its 1% then multiply your diagonal rod length in config by 0.99 (0.98 if 2% etc) then autocalibrate but do not allow the calibration routine to change rod length. As for effector dropping buy a key chain retractor of good quality I use mine to support my umbilical cable in a nice loop going up from effector.by DjDemonD - Delta Machines
Re: Magnetic push rods causing fan malfunction - 8 years ago
I've had the issue of fans stopping randomly due to magnetic arms. Also fans generating interference on smart effector strain gauge. Make a fan shroud to extend the fan out or down by 10mm or so, the magnetic force drops to the square of distance so you don't have to move it much.by DjDemonD - Delta Machines