PBHQ's Alpha CNC...

PBHQ's Alpha CNC...

Postby DonaldJ » 2014-May-Wed-16-May

Over on the Twitter feed there is an image of an "Alpha" version of a CNC, which looks nice.

But unless it is *very* inexpensive, I don't see how it can be a "disruptor." It looks similar (but not as good) to existing desktop CNC machines, some of which are priced at around $650 (ShapeOko2 kit).

Is there something else up the magical sleeves of Brook Drumm? A complete CAD/CAM tool chain would do the trick.
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Re: PBHQ's Alpha CNC...

Postby redwood » 2014-May-Wed-17-May

Interesting developments. I do like how they are always coming out with new stuff over there.
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Re: PBHQ's Alpha CNC...

Postby REPRAP SQUAD » 2014-May-Wed-18-May

I like it too but it does look a lot like shapeoko and it says that it's closed source. I hope that this isn't an early warning that printrbot Is going to change their licensing. Only time will tell.
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Re: PBHQ's Alpha CNC...

Postby redwood » 2014-May-Wed-19-May

Maybe they commissioned someone or used a 3rd party for the software part and that was their term? I just checked all of the comments and its not Printrbot's call on it.

https://twitter.com/printrbot/status/463907413221863424
I totally understand- the software is a vendor partner- you can choose to go open. I’ll sell the hardware alone too.
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Last edited by redwood on 2014-May-Wed-23-May, edited 1 time in total.
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Re: PBHQ's Alpha CNC...

Postby REPRAP SQUAD » 2014-May-Wed-20-May

Good deal, I know that brook has always told me that they will stay open source.
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Re: PBHQ's Alpha CNC...

Postby DonaldJ » 2014-May-Wed-23-May

This is beginning to look like a lot of fun.

The TinyG is a great board, and it's open source: http://makezine.com/magazine/motion-con ... nyg-story/

If the CNC project uses the Raspberry Pi and TinyG, might not that combination be a nice upgrade to the Printrboard with OctoPrint?
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Re: PBHQ's Alpha CNC...

Postby thawkins » 2014-May-Thu-02-May

DonaldJ wrote:This is beginning to look like a lot of fun.

The TinyG is a great board, and it's open source: http://makezine.com/magazine/motion-con ... nyg-story/

If the CNC project uses the Raspberry Pi and TinyG, might not that combination be a nice upgrade to the Printrboard with OctoPrint?


the only problem with tiny g is its yet another low power (cpu) board, its a little more muscle than an 8 bit avr chip, but not much more.

as an industry we need to leave avr8 and avr16 behind now and move onto arm32 and arm64 platforms runnjng at resonable speeds, and multiple cores.

duet and ramps-fd all put you into that space, duet has a built in arm32 core and the ramps-fd sits ontop of a arduino due, again an arm32 platform.

http://reprap.org/wiki/Duet

if the pi had more gpio it could make a good controller, the new dimm form factor version is interesting

http://www.raspberrypi.org/raspberry-pi ... w-product/


i really dont understand why the controller boards keep getting built with these wimpy cpus in them you can buy a quad core arm64 tablet for $60 which has far more expensive components in it, and that kind of device can run thousands of rings around any of the current crop of boards, even the arm32 ones above pale into insignificance compared to the average cpu runing a smartphone or tablet
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Re: PBHQ's Alpha CNC...

Postby DonaldJ » 2014-May-Thu-21-May

thawkins wrote:
i really dont understand why the controller boards keep getting built with these wimpy cpus in them you can buy a quad core arm64 tablet for $60 which has far more expensive components in it, and that kind of device can run thousands of rings around any of the current crop of boards, even the arm32 ones above pale into insignificance compared to the average cpu runing a smartphone or tablet


My guess is that faster CPUs aren't needed. The physical and mechanical limitations to FDM printing and CNC machining may preclude the need for faster CPUs.

Would your theoretical controller board allow me to print at 1000mm/sec ? Speaking as a Big Dummy (TM), I'd like to know how a faster CPU would improve performance.
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Re: PBHQ's Alpha CNC...

Postby Jon Lawrence » 2014-May-Fri-11-May

DonaldJ wrote: My guess is that faster CPUs aren't needed. The physical and mechanical limitations to FDM printing and CNC machining may preclude the need for faster CPUs.

Would your theoretical controller board allow me to print at 1000mm/sec ? Speaking as a Big Dummy (TM), I'd like to know how a faster CPU would improve performance.

Using the current Printrboard as an example, the maximum output to the stepper drivers is 10,000 pulses per second. Is we use the stock 1/16 micro stepping and a 80 micro steps/mm drive pulley, that translates to around 120 mm/s maximum. Stepper motors can run faster than that and extruders can extrude faster than that, so the CPU throughput is the bottleneck here to high quality fast smooth prints.
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