First post, just an idea. please dont hate

Re: First post, just an idea. please dont hate

Postby HenryJenk » Fri Mar 07, 2014 11:26 pm

I finally dug out the old meccano kit from the attic and whipped this up today i hope this helps you understand me better.
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Re: First post, just an idea. please dont hate

Postby MrFaul » Sat Mar 08, 2014 10:36 pm

Seems I got it right on the first try ^^.
Unless you want to create extra motor controlled axis this is no good.
It would destroy the predictability of the arm position <- which is necessary if you want to know where you are, since the firmware only guesses where it is, based off the calibration points (limit switches).
Those appendix would just wobble around making it impossible to tell where the arm is.
If you look at the quick paint draft you see that it could be anywhere on the dotted line.
Won't happen with the fixed position as shown in the upper image.
Image
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Re: First post, just an idea. please dont hate

Postby HenryJenk » Sun Mar 09, 2014 8:07 pm

Thank you for the speedy reply and i see what you mean yes i agree now thank you for clearing this up i can now put this idea to rest. but you were talking about the predictability of that machine so as i read that i was wondering to get it more accurate could you have an IR beam on the side of the extruder (obviously not right on side i dare say it would melt lol) and have a grid on the bed so when the IR beam breaks of the black and on to, lets say grey grid the printer knows where it is at. i do not think this would have any affect on the actual printing side of things but it could help with a very accurate calibration... just as before could i have some information on why this wouldn't work or why it wouldn't be useful in the first place... honestly i have some stupid ideas at times but can never get answers on them lol please stay patient :D.

TL;DR... IR positioning yey or ney
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Re: First post, just an idea. please dont hate

Postby MrFaul » Sun Mar 09, 2014 10:56 pm

Using CV (Computer Vision) for calibration is actually a great idea and I had it myself longtime ago.
However CV has some serious requirements.

If you look at 3D printer they are actually pretty basic machines. All what they are doing is pretty much what they are told (gcode). And for that they are using Micro- controllers like arduino and co.

Micro- controllers are made for one purpose, given the name controlling things which means they don't have much "brain" but are able to do the given task in a very reliable way. That means all "thinking" which is involved in a print is made is somewhere else (slicer software and/or printer host on a computer).

So for CV you need a powerful "brain" (CPU) or even better many "brains" (GPU/parallel processing).
That requires a Mirco- processor like Raspberry Pi or Beagle Bone with enough power to for CV.
You may now be asking if Micro- processors are that powerful why don't use them to control the printer directly?
The answer is pretty simple they are unable to do one task with the same reliability like a Micro- controller since they have to do many task at once in example running the OS.
Anyone who had a 20h print messed up because the computer went haywire (yeha thanks windows updates) knows what I'm talking about. That's the reason why time intensive prints should run stand alone reading the gcode from SD card it is also more smooth since there is no USB input lag.

That was the hardware aspect on the software side you have to get anything under one hat too, besides the fact that CV is complicated on its own.

That said yes it is totally possible to use that method but I don't think anyone is patient enough to give it a try.

Here is a youtube video explaining micro- controller vs processor in more detail:
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Re: First post, just an idea. please dont hate

Postby HenryJenk » Sun Mar 09, 2014 11:42 pm

that video actually helped me allot thank you, because my next question was going to be why dont people do a raspberry pi supercomputer to get the most processing power and be able to run a hefty machine, the cost of this would simply undermine the value of a 3d printer though. but here is an idea could you have one to run the 3d printer and then another to run anything else addon wise E.g computer vision and then network them together. it would be a big job to do though, but would the end product be worth it ?

also im looking for a place to buy the plastic bits for the GUS Simpson but unfortunately my ebay searches have come up empty handed is there a specific place i should buy them from ?
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Re: First post, just an idea. please dont hate

Postby Nicholas Seward » Mon Mar 10, 2014 3:25 am

My suggestion would be to get a boring Cartesian printer for your 1st printer and then use it to experiment with GUS.
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Re: First post, just an idea. please dont hate

Postby MrFaul » Mon Mar 10, 2014 11:26 am

I agree with that, GUS as first 3D printer is really hardcore if you have no experience in what so ever.
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Re: First post, just an idea. please dont hate

Postby MrFaul » Fri Mar 14, 2014 11:19 am

Oh about buying the parts, I don't know where you live but if you don't find anybody who prints them there is always shapeways. Lol just thought about it, a metal gus maybe it is worth a try xD but before I should slimm down the parts to save weight and money xD
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Re: First post, just an idea. please dont hate

Postby Guizmo » Fri Mar 14, 2014 2:26 pm

MrFaul wrote:Oh about buying the parts, I don't know where you live but if you don't find anybody who prints them there is always shapeways. Lol just thought about it, a metal gus maybe it is worth a try xD but before I should slimm down the parts to save weight and money xD


I have considered that but it is 'extremely' expensive, even printed in polyamide. At least for me it is.
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Re: First post, just an idea. please dont hate

Postby MrFaul » Sat Mar 15, 2014 8:52 pm

I would probably go for a wire mesh construct with reinforcements where it counts but that would be definitely over the max file size they accept xD. (stl is a really bad way for saving geometry)
Maybe I make the model just for fun but I don't think so since it is a mother load of work and I'm very lazy (faul ger. ~ lazy eng.^^) .
Still would be looking awesome....
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