USB Ports on the Y-Car - no really...
I'm getting to the final stages of my MechMate build and I'm wiring for proxies, z-touch plate and e-stop. It occured to me (and others I suspect...) that putting USB ports into the y-car might not be a bad idea. Here's why -
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An interesting argument.
Is there a heavy duty cable that can withstand the constant movement? The USB 2.0 limit for length is 16 feet (5 meters), so that is a consideration too. |
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USB signals are transmitted on a twisted pair data cable with 90Ω ±15% impedance,[6] labeled D+ and D−. These collectively use half-duplex differential signaling to combat the effects of electromagnetic noise on longer lines. D+ and D− usually operate together; they are not separate simplex connections. Transmitted signal levels are 0.0–0.3 volts for low and 2.8–3.6 volts for high in Full Speed and Low Speed modes, and ±400mV in High Speed (HS) mode. In FS mode the cable wires are not terminated, but the HS mode has termination of 45Ω to ground, or 90Ω differential to match the data cable impedance. Quote:
Maximum Useful Signalling Distance Although a single cable is limited to 5 meters, the USB specification permits up to five USB hubs in a long chain of cables and hubs. Consequently the maximum possible signalling distance is 30 meters, using six 5-meter cables and five hubs. In actual use, the last hub is a more convenient endpoint since some USB devices include built-in cables intended to directly connect to a hub, setting the maximum useful signalling distance at 25 meters. Because USB is able to provide power for additional devices connected to the bus, a special type of USB extender cable was created which consists of a miniature one-port USB hub molded into one end of a 5 meter cable. These mini-hubs are fully self-contained within the cable, requiring no separate bulky hub device, and are as simple to use as plugging cables together, with each hub drawing power through all the previous single-port hubs in the chain. |
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USB extension for USB in y-Car
Here is an extension that uses standard ethernet cable to extend the USB up to 150ft. The only downside is it is at USB 1.1, not 2.x
http://www.dealextreme.com/details.dx/sku.6640 http://www.dealextreme.com/productimages/sku_6640_2.jpg |
Here is a link for a USB2 RJ45 Adapter.
http://www.directron.com/usbrjxt.html David, I like your "outside the box" thinking. The idea of a web cam cruising around on my Y car pointed at the bit is actually a bit interesting to me. Even with no "practical" use - which I'm sure I could think of a few - it sure would be cool. :cool: |
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Accurate video-based center finding built into Mach3: http://www.machsupport.com/forum/ind...ic,2519.0.html The ability to safely watch the progress of a job without sticking your head and hands near the router. It should also allow a closer view than you could get hovering over the table looking at a bit spinning at 20,000 RPM. This is even more useful for people that have their CNC machine running in an isolated room. For people with staff handling machines, it might be useful for monitoring. |
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