[Noisebridge-discuss] Moar Laser Cutter Infos

[Mitch Altman]

Hi Zach,


I hope you can fix it!


The jnmydy website says they are in Jinan, which I won't be able to get to while in China.  But, if you can contact someone there, you can have them mail the boards to me in Beijing.  I can bring them home with me or, since I won't be home till the end of January, I ship them from China, where shipping is really cheap.  I can also pay them directly in Chinese RMB from China (everyone there uses an app called WeChat, which I also have, which can do pretty much *every*thing, including send payments).


If the language barrier is a problem, I know Chinese people who can help.


Best,

Mitch.



________________________________
> From: organicunity at hotmail.com 
> To: noisebridge-discuss at lists.noisebridge.net 
> Date: Thu, 12 Nov 2015 20:47:04 +0000 
> Subject: Re: [Noisebridge-discuss] Moar Laser Cutter Infos 
> 
> 
> Wow, that's some super useful info Danukeru! Good thing we discussed 
> this on this list so you came across the thread. 
> 
> Mitch, if you are going to China why not just ask about the parts we 
> need from the company based there? Their website is actually printed 
> on the PCBs inside the Laser Cutter: http://www.jnmydy.com/ 
> 
> http://s18.photobucket.com/user/Segasonicfan/media/NB%20Hardware%20Class/20151015_225704_zps2heogqs2.jpg.html?sort=3&o=1 
> 
> If you get the PCBs direct from them I bet it will be much, much 
> cheaper. I sent them an email in English (on their English website 
> version) but received no reply yet. Perhaps someone can translate? 
> 
> and again, let me try and fix the main power PCB before we make any 
> decisions on buying a new one (unless someone has money to burn!). It 
> would be a super huge waste and would be like replacing an entire car 
> when you just need a new battery and wheels. 
> 
> -Zach 
> 
> 
> ________________________________ 
> From: noisebridge-discuss-bounces at lists.noisebridge.net 
> <noisebridge-discuss-bounces at lists.noisebridge.net> on behalf of 
> Danukeru <danukasan+nb at gmail.com> 
> Sent: Thursday, November 12, 2015 12:53 AM 
> To: Zachary Morriss 
> Cc: noisebridge-discuss 
> Subject: Re: [Noisebridge-discuss] Moar Laser Cutter Infos 
> 
> Reading the manual for the laser cutter reveals that we could already 
> drive the laser cutter now with a copy of EMC2. 
> 
> We have a custom toolchain built around EMC2 for our hobby CNC at 
> foulab, so I can tell you pretty certainly that your standard LPT-USB 
> board/cable will not work due to buffering of the pin state that their 
> controller board most certainly does. 
> 
> EMC2 is a GCODE interpreter that drives an analog controller over LPT 
> directly. 
> 
> EMC2 takes advantage of the LPT port to make sure that the timing is as 
> accurate as possible because there is very little feedback from the 
> steppers themselves. You generally need a real-time linux kernel for 
> the best results for this reason. Our CNC runs on an old ubuntu with 
> such a kernel. 
> 
> Due to USB being much faster, packetizatioin, driving voltage levels, 
> no guarantee on command order, etc, there is no assurances on timing on 
> the LPT pins with a cheap adapter. You'll most likely have cumulative 
> errors/jumps/ etc on actual long runs . 
> 
> The LPT board in the cutter itself is very dumb and relies entirely on 
> what is driving it. It's literally a bunch of shift registers bitbanged 
> over the LPT by either EMC2 or the USB controller in this case. 
> 
> As such this is where the buffering comes in on that small board. 
> Proper timing and command queuing. 
> 
> ie. Why Henner's BUMPS cape for the BBB uses the A8s specific 
> programmeable PRU for real time control of the pins. 
> 
> 
> 
> On Wed, Nov 11, 2015 at 9:00 PM, Zachary Morriss 
> <zmorriss at gmail.com<mailto:zmorriss at gmail.com>> wrote: 
> I don't want to distract this perfectly excellent hack in progress, but 
> being that the laser is EOL, it might be time to invest in some new 
> jank: 
> http://www.amazon.com/Engraving-Cutting-Engraver-Parallel-Winsealxp/dp/B00C9UZCOS/ref=sr_1_1?ie=UTF8&qid=1447304268&sr=8-1&keywords=40+watt+laser 
> 
> Price goes up and down and can be had cheaper on ebay. 
> 
> Or even better, something with a DSP controller, z adjust, air assist, 
> and a little moar power: 
> http://www.aliexpress.com/item/Free-ship-Best-price-rayjet-laser-engraver-3040-co2-laser-cutting-machine-50W-with-rotary/32247621015.html?spm=2114.01010108.3.48.cC334H&ws_ab_test=searchweb201556_1_71_72_73_74_75,searchweb0_0,searchweb201560_9<http://www.aliexpress.com/item/Free-ship-Best-price-rayjet-laser-engraver-3040-co2-laser-cutting-machine-50W-with-rotary/32247621015.html?spm=2114.01010108.3.48.cC334H&ws_ab_test=searchweb201556_1_71_72_73_74_75%2csearchweb0_0%2csearchweb201560_9> 
> 
> Just stirring the pot, 
> Zach 
> 
> 
> On Wed, Nov 11, 2015 at 8:22 PM, Brian Klug 
> <brian.klug at gmail.com<mailto:brian.klug at gmail.com>> wrote: 
>> USB to DB25 Adapter Uses GRBL For Parallel Port CNC ... 
> 
> The following USB <-> GRBL interface might help..? 
> 
> http://www.esreality.com/files/placeimages/2013/93363-gerbil.gif 
> 
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