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Re: Where can I find info about the details of printer design - 7 years ago
Thanks. That certainly helps. From your drawing it looks like the width between lines should be a little wider when the height between layers is smaller. ...Rby Robin2 - Developers
Where can I find info about the details of printer design - 7 years ago
I have been unable to find anywhere that explains the detail design requirements for a 3D printer. I understand the general way in which they are constructed and the general way in which they work. But I am curious to know, for example ... What determines the speed at which a line can be printed; what happens if the motion is too slow or too fast? What determines the minimum width of a printedby Robin2 - Developers
Re: A4988 driver maximum stepper speed? - 10 years ago
@hercek, thanks, that's the first specific information I have been given. QuoteTraumflug Yes. Just find a firmware which can produce step pulses at a sufficiently high rate and features acceleration. Some quick-shot Arduino sketch won't do it. See I haven't tried microstepping yet (as @hercek has suggested) but I got the same speed limit using the AccelStepper library with acceleration as withby Robin2 - General
Re: A4988 driver maximum stepper speed? - 10 years ago
QuoteVDX With optimal selections you can get something around 1200 rpm from steppers ... Is this possible with an A4988 driver? Do you have any suggestions for the specific motors? ...Rby Robin2 - General
A4988 driver maximum stepper speed? - 10 years ago
I am curious to find out what is the maximum speed (revolutions per second or per minute) that people have achieved driving stepper motors with Pololu A4988 stepper driver boards, and what motor they were using, what supply voltage etc. I have some of these motors and the highest speed I can get with a 24v supply is about 1200 full steps per second which is 6 rps or 360 rpm. I have asked the saby Robin2 - General
Re: RC servo printer/router - 10 years ago
That sounds like you are thinking of continuous rotation servos. The problem with them is that there is no control of position so it would probably be easier to use steppers. If a max of 3.5 rotations would be enough you could possibly use a sail winch servo which does have position control. ...Rby Robin2 - General
Re: RC servo printer/router - 10 years ago
I can't figure how you intend to use the servos - what are they supposed to move? GCode is very easy to follow - there are plenty of websites about it. If you have a short piece that moves a tool-tip from x1,Y1 to x2,Y2 then you should be able to relate that to what you want the servos to do. Then it would be possible to give you some guidance about how to write a program to convert the GCode inby Robin2 - General
Re: Pultrusion not Extrusion - 10 years ago
Quoteohioplastics The problem with 2 part solutions and uv curing is that it doesn't achieve the necessary "pull" or downward force to bring the resin out of the nozzle. The adhesion to the substrate, the print bed on the first layer and the extruded plastic on the rest of the layers, would need to provide all of the force necessary force to draw the filament out. Given that that force is extreby Robin2 - General
Re: Pultrusion not Extrusion - 10 years ago
I don't think pultrusion is the appropriate word. Pultrusion (see Wikipedia) involves something being pulled through a die and doesn't have to involve the combination of two chemicals. I can't see how a spider could "pultrude" because the component chemicals are unlikely to have any tensile strength until they have left its body and mixed. However the idea of extruding one or two liquid chemicalby Robin2 - General
Re: Stepper drivers keep breaking. - 10 years ago
Are you sure they are broken? Did the smoke escape? Or did they just shut down and need time to recover? Do they always "break" at the same physical location? ...Rby Robin2 - General
Re: My DIY 3D Printer approach - 10 years ago
Did he sell you a Swedish metre of welding rod? ...Rby Robin2 - General
Re: My DIY 3D Printer approach - 10 years ago
I'm hoping to use my small lathe as a the "mechanics" of a small 3D printer so that the same machine can be used for CNC work and 3D printing. I got some Nema17 steppers which seem to be sufficient (it won't have fast motion) and in the last couple of months I have been sidetracked by a model railway project. In my concept the extruder will be stationary and the work-base will move in three dimeby Robin2 - General
Re: looking for info on how to bootload atmega1284p - 10 years ago
I'm pretty sure you will find an answer to this on the Arduino Forum, and I suspect the answer will be "yes". ...Rby Robin2 - General
Re: Trying to use Teacup with an Arduino Uno - 10 years ago
The Arduino Uno analog pins can be used as digital pins - maybe there was no need to change the pin configuration. If Teacup is written for an Arduino Mega you need to be aware that there are some significant differences from the Uno - things are in different places and, depending on how Teacup is written, they may not automatically adjust. I suggest you read the Atmel datasheets for the Atmega3by Robin2 - General
Re: Simulated Arduino and 3D Printer - 10 years ago
What exactly do you want to test? If you are thinking of something that will validate 3D designs or any part of the software chain I think you will find it a major challenge. Simulating real-time computing is by no means simple. ...Rby Robin2 - General
Re: new dimension of reprap electronic? - 11 years ago
@iquizzle, I agree with all you say about higher level languages. However as I see it everybody already owns "an additional computer to operate ethernet capabilities ". And the development of software for a Beagle Bone Black doesn't come for free - the developer could do something else with his/her time. My concept is to simplify the code on an Arduino (Uno should be enough) and shift as muby Robin2 - General
Re: new dimension of reprap electronic? - 11 years ago
QuoteTraumflug I mean, I have no doubt this can be done. I just think a dedicated controller is simpler and more reliable. and cheaper. ...Rby Robin2 - General
Re: new dimension of reprap electronic? - 11 years ago
QuoteTraumflug a RepRap controller needs to handle more like 50.000 precisely timed events per second. I suspect a Linux PC with a 1.6GHz CPU could very easily manage 50,000 per second. On my netbook interpreted JRuby will do 50,000 loops in about half a second. ...Rby Robin2 - General
Re: new dimension of reprap electronic? - 11 years ago
Will it be cheaper than a cheap netbook? ...Rby Robin2 - General
Re: Required motor power - 11 years ago
When I wondered if the extruders could cope with the extra speed I wasn't thinking about the power needed to drive the motors but the more important question of whether the goo can be made to come out quickly enough while remaining under control. ...Rby Robin2 - General
Re: Required motor power - 11 years ago
@lobocnc, it looks like "nobody knows or cares". Maybe the best you can do is draw inferences from the sizes of stepper motor actually used in successful projects. On the other hand if the project is successful why bother changing to a different type of motor? I'm guessing your motors will be more expensive but may allow greater speeds. But can the extruders cope with higher speeds? There seemby Robin2 - General
Re: Required motor power - 11 years ago
I think there is some confusion here and people are talking at cross purposes. As I understand it the OP ASKED for information about typical Reprap hardware and ASKED if an acceleration of 10,000mm/s/s (~1G) and a top speed of 500mm/s are typical. It seems as if people think the real figures are much lower than this, but nobody has said what the realistic figures would be. I see nothing stranby Robin2 - General
Re: Nozzle internal geometry - 11 years ago
On which side of the land (assuming it to be 20mils) should the angels stand? And how many? ...Rby Robin2 - General
Re: DIY EDM - 11 years ago
Thanks all. Something to keep in mind for the future. Because I hadn't imagined it would work at a hobby scale it hadn't occurred to me to try Wikipedia. ...Rby Robin2 - General
Re: DIY EDM - 11 years ago
I read an article about this recently in which a cylinder (for a steam engine) was machined from a casting - obviously industrial scale. The article seemed to assume the readers were familiar with the technology. I had assumed that it would require a complex dangerous high voltage power supply. But it seems from the earlier posts here that it works fine at a small scale with relatively low voltaby Robin2 - General
Re: Microstepping and Current setting Guide - 11 years ago
jamesdanielv Wrote: ------------------------------------------------------- > the current you would use at 12v. Just to clarify - this is the current limit at all voltages. However if you are driving the motor with a 12v supply you would expect only to see 0.33A even if the current limit on the driver board is set for a higher figure. You will need to check the setting of the driver board uby Robin2 - General
Re: Microstepping and Current setting Guide - 11 years ago
There are instructions on the Pololu A4988 page for setting the current limit on that board. If, as they claim, the A4982 Stepstick board is compatible those instruction may also apply to it. BUT --- I DON'T KNOW. Do it at your own risk, or ask the Stepstick people. ...Rby Robin2 - General
Re: Nozzle internal geometry - 11 years ago
Thanks for that @A2. You have been busy. While it was only by accident, I think my inference from the patent application is consistent with your definitions. Maybe this is one of those cases where I heard the word used in the past and assumed it meant something different from what the author intended - but I can't remember any examples now. ...Rby Robin2 - General
Re: Nozzle internal geometry - 11 years ago
Having looked at the patent and its drawings I think it's important to note that it involves two nozzles - one for the optical fibres and one for the optical fibres covered with plastic. The fibre nozzle can be screwed in and out to vary its distance from the extrusion nozzle. I think the word "land" is used to refer to this distance and it may be ued in the sense that that is the space in whichby Robin2 - General