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I agree wholeheartedly that embedded controllers are the way to go. They're cheaper, better performing in most cases (with the RIGHT uC) than the "good' ol' days" config shackled a modern multi-core PC. Arguably more reliable too.
Food for thought:
A BeagleBone Black (Rev B.) is $55
+8gb micro SDcard $10
+MachineKit distro (free)
+5v,2A(10watt) regulated power 'brick' @ $10
+Probotix PBX-BB brea
by
dewy721
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EMC2
Last time I checked, both SLI & Crossfire pertained to memory bus sharing between Video cards. Not that GpGPU processing fundemenatly couldn't be harnessed to do it, but you *would* need some one-off custom hardware to get that "this century" processing power connected via the DVI Jacks (the real-world lowest latency interface for a video card). Or hardware that can at least read/write to you
by
dewy721
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EMC2
You can drive most common stepper drivers boards from a old-school PC's printer port directly. LinuxCNC (aka, EMC2) users have been doing it for literally decades.
Also, if needed you can buy LPT printer port expansion cards off of ebay for 10~20$US. General rule of thumb is that you will need one DB25 per 3 axis (stepper driven). So a 9 axis machine would need a PC with 3 parallel ports install
by
dewy721
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EMC2
If anyone is interested, HAL2Arduino has been released.
Its a communications framework that exposes the HAL interface pins from LinuxCNC to the Arduino (or multiple Arduinos simultaineously).
Its intended for people that wish to write their own firmware but don't want the headaches if creating a gCode interpreter and communications protocol from scratch.
Features supported:
- Automatic scannin
by
dewy721
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EMC2