Cable Tracks and First Jog
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- Опубліковано 17 вер 2019
- In this video chronicling my CNC Plasma build, we mount the cable track and run enough cables to finally put the machine into motion.
The cable track I sources is a little too small but I will make it work. I roughed in the motor and e-stop cables using 4 conductor 18awg shielded cable. The end result is a machine that moves smooth and precise as least to the point a plasma table needs smooth and precise.
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I hope to get the next video out on this topic is less time than it took to do this one. I have not completed the machine yet so you haven’t missed the first cuts. That will be coming this winter.
~P.
Web site: sbirdranch.com
Amazon: www.amazon.com/shop/sbirdranch - Навчання та стиль
I really appreciate you sharing this information you have a blessed day
Hey Preston, great video. You have always seemed down to earth. (Electrical humor) Great editing with the 2 for one shots. FYI my home built RPC is still running great!! Thanks for the tutorial on that.
Looking good
Thanks for sharing your videos and experience with CNC building. Lots of useful insights that can be applied. I am more for wood and plastic so the 3 machines I’ve built are much lighter and suited to my purposes. I seem to have settled on GRBL after being in the Marlin world briefly learning printing and really like it. My friend who has been a Mach3 guy for years has also moved over to GRBL now. They are another great tool for general purpose shops.
Great job! I really like your work, nice and clean.
They make the cable tracks with cable separators inside and some have walls to keep control wires separate from power wires.
Our plasma and gas lines were run in a second cable track set about 2" apart from your control track. I use to repair, build and convert flame machines to plasma cutting machines.
Interesting info. I appreciate the 'real world' information. I often wonder if in some ways I try and make things too compact and delicate. We are cutting steal with electricity and plasma...that should deserve a little size. :) ~P
Your build is moving faster than mine was.
Great job!!!👍👍
How is the CNC Plasma table building going? Looking forward to your next video.
Progress stopped last fall with the cutting of my first test parts. I paused to put a ceiling and insulation in that part of my shop. I also don't like my initial store bough Z so that is getting an upgrade. Then life happened. Now that fall is here I'm looking forward to getting back at it. Progress is slightly ahead of my videos but not much. ~P
NO! You NEVER ground both ends of the shielding. That just helps cause what you're trying to avoid. Ground only one end so the induced interference can drain away and do the grounding for everything at a common ground like in the control box.
Very important point!
I have since learned that you don't ground both ends of the shielding an signal wiring, Like the signal wiring from a DRO sensor to the readout, but you do ground both ends of the shielding on power wiring. That is like the wiring from a VFD to a spindle motor.
MY BAD!
did you get your table finished? liked the design and have used some of your ideas! Cheers
Look great 👍 Question, grounding both ends of a shielded cable my induce ground loops a specially with plasma discharges,
Is that a question or a statement?
It's a poorly constructed question, Are you concerned about ground loop with both ends grounded?
@@SouthernEngineering Well I hadn't considered that. Figured a ground was a ground. I have heard of that in electronic circuit design but I'm not smart enough to understand it. I'll make some inquiries. P
@@sbirdranch EE here, you don't want to connect both ends of the shield on the cables. No two points on your machine frame will be at the same electrical potential when the torch is on. If you connect the shield at both ends you end up making a transformer primary from the shield and the signal wires become the secondary. Not what you want. If there is one common location where the majority of the shielded cables terminate, that is the simplest place to connect all the shields to the same ground point.
Basically, what happens is this, when you ground a shielded cable at both ends you can induce a current in the circuit, considering the amount of energy in a plasma cutter, the steel frame and the separate electrical cabinet you run the risk of fast transients introducing noise on the control and sensor lines; something to watch for if see glitchy operation from time to time. How you mitigate is by grounding the shield line at the instrument control but not at the sensor, generally!
Just earth one end of the each run of shielding, otherwise you can make earth/noise loops?
What do you plan to cut with this machine?
How do you go about selecting the motors. I am stuck right now on rpm vs torque. I know for thinner material you want speed but I am not sure what rpm I need to achieve optimal performance
I have never thought much about motor RPM as I just figured stepper motors all spun about the same at full voltage, unloaded. I have done the calculation to include any gear reduction (or increase) and verified that the inches per minute (IPM) were going to be enough. In fact, I have really been more interested that the resolution of each step is small enough to create the detail I want. ~P
@@sbirdranch Thank you for the reply. I am actually looking to use tecnik sd servos for my plasma cnc so the resolution is not really a problem. They range from 1k to 4k rpm. I want to use a direct drive system. I will look into IPM and see if there is an answer there. Thanks again for the reply!
When did you record this? You're wearing a coat?