Me too.  A closer look at the fine print and selecting the correct button shows 
the actual CNC controller is $513 or $541 for 3 or 4 axis respectively.  The 
MPG is priced separately at $96.

And this is why a BBB with a cape that included a Break Out Board with a few 
relays etc. for under $100 would be quite the bargain.  The question is then 
what sort of display would be good.  And you still need some sort of MPG to go 
with it for also about $100.

For $94 I can get, from amazon.ca  a 7inch HDMI LCD (H) 1024x600 Monitor IPS 
Screen Capacitive Touch Display Supports Raspberry Pi Jetson Nano BeagleBone 
Black Banana Pi & Microsoft XBOX360, Sony PS4,Nintendo Switch

And therein lies the problem.  Creating something similar to the $500 Chinese 
CNC controllers with touch screen will ultimately cost in the same $500 range.  
But unless the MachineKit or LinuxCNC version is stable with a target life 
similar to the life of the machine tool no one will spend the energy and time 
to make that.

The market isn't big enough to justify the work required.  Which is why so many 
of the Beagle Capes are no longer available.  Next week there's an new ESP32 
with more bells and whistles.  Won't do what the Beagle does but ...

John


> -----Original Message-----
> From: Martin Dobbins [mailto:tu...@hotmail.com]
> Sent: August 5, 2023 11:44 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Beaglebone black latency
> 
> It makes me wonder which operating system they put on that Chinese
> controller, and what motion control system.
> 
> Martin
> 
> ________________________________
> From: John Dammeyer
> Sent: Friday, August 4, 2023 7:41 PM
> To: 'Enhanced Machine Controller (EMC)' <emc-
> us...@lists.sourceforge.net>
> Subject: Re: [Emc-users] Beaglebone black latency
> 
> My biggest issue with the Xylotex BBB Cape for CNC was that the logic for
> ESTOP was inverted.  ESTOP was a N/O switch so if a wire was broken you
> wouldn't find out until you tried to save a body part from being injured with
> the ESTOP.



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