[Noisebridge-discuss] Moar Laser Cutter Infos

Scotty Allen scotty at scottyallen.com
Fri Nov 13 12:02:43 UTC 2015


I'm also happy to help on the China end of things, if it's useful.
I'm currently in Shenzhen, and will be here at least 2 more weeks.
Holler if there's a way I can be useful.

-Scotty

On Fri, Nov 13, 2015 at 5:15 AM, Mitch Altman <maltman23 at hotmail.com> wrote:
> 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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