Thnaks for watching this video. If you have any questions, or comments, please post them below. As I said in the video, I will remake the video from comments that affect the content of the video so this video can be relevant at any time. If you want to see more detailed videos on each of the limit switches and e-stops, I will be creating them soon.
Subbed. The timing of this video is perfect I’m wiring up my rockers and Estops on my enclosure. Hunter Whites design. I like the concept of the constant updated videos.
Informative video! 6:11 You should do another video on the repeatability / accuracy on the various styles of limit switch's. The longer the lever the less repeatable / accurate the switch is.
@@johnbowden504 The cable shield (the braided shielding) should be connected to ground at a single point (to avoid ground loops when there is a voltage potential difference between two ground connections). So at one side of the cable. You think that ground=ground everywhere (when linked or connected by wire/metal) but there can be slight potential differences (also induced by radiation noise). And when there is a potential difference, current will flow. You don't want current in the shielding, it should just act as a Faraday cage at one ground potential.
@@johnbowden504 Ground to a common bus bar at the controller end only, attach the work lead to this point as well then ground the buss bar it to an earthen rod with a lead the same size as the work lead. Hypertherm and a few other companies has a bulletin on this..
Very easy to understand , good video. I have a couple of comments. Can you explain how to configure the controller limit switch (mechanical) to accept a low or high input?
I think I did this in other videos, but I can't remember which one. I really should create a set of notes with what I have in my videos. It would help me so much when answering comments.
Nice video with lots of information. I have not found any video of yours showing how to connect the z- probe using the bitsensor controller card and mach 3. Thank you in advance.
I will be working on this very soon. Generally, however, you are going to connect the probe to one of the inputs and use a script to zero the probe. In my coming video, I will show the script and how it works line by line. Alternatively, you can also use a probe in the "ref all home" process.
Interesting information Thank you for sharing it … I have a point … i built my CNC plasma and I got EMI issue… i do my research and figured how to wire it .. exactly like you say but except the grounding it should go to earth capper bar and in to the earth AC ground rod … i don’t know if it gone work cause i still not wired my cnc yet. Thank you so much for the video.
Absolutely. You are correct as you want to create a ground rod specifically for your plasma. Unfortunately, this video needs to be machine agnostic, and adding detailed information for a specific condition might be confusing to the viewer. I will be addressing this in a video on plasma and THC setups, however.
On my torch lifter I have 3 switches. One is a home switch with two limit switches. I have a 4 pin aviation plug connecting for the torch lifter housing. I want to use a 4 conductor shielded cable for wiring all three switches coming out of the torch housing. Would it be acceptable to jump the ground on the home switch to the ground on the limit switches with the shielded ground? That way I would be using the shield wire for all the switches.
Yes, you can connect the sheild to any ground. It's best to keep the grounds and the sheilds as close to a point as possible to reduce any ground loops.
Use a common bus bar for all grounds and the work lead of the plasma torch, then tie this into a earthen grounded rod with a cable the same size as the work lead on the plasma source. Ground only the controller end of shielded cables.
I am using a "bl-usbmach v2.0 d1712" board. It has the folowing connections: GND, In1-Estop, In2-Probe, E3-Limit, In4-Home, In5-Reverse. I have 6 endtops. 2 endtops per axes in seris. So i only have one Endtop connector on the controller but i also have a Limit-connector. What are the differences in theese 5 connections? This is how i think i should connect my endstops: ENDSTOPS ------------------------------------------------------ | | | | X Y Z axes | GND GND GND | E1 E2 E3 E4 E5 E6 | | | | | | | | ----------- ----------- ----------- | | | | | In1 In2 In3 GND Question 1: In one youtube video he has 3 endstops, X, Y and Z. He connected all endstops in series so like this: axes X Y Z + -------------- E1 --------- E2 --------- E3 -------------- GND How does Mach3 know witch axes will be trigered? There is only one connection for all axes witch i think is not how it should be. I think that every axes should be seperated on one side of each axes. Question 2: The only ground on my cnc is on the powersuply 220v. Can i connect every Ground (and also the Shield of the wires) to the Ground of my powersupply (220v)? I only find information on how to shield your cnc but no info on how to connect shielding in your electronic-box. So a lot of these tutorials are not complete i think. If you show info about shielding then show everything from wiring to connection at the source.
Question 1: In general for limit switches (not home switches), the determination of the axis that triggered the switch is not important. The importance lies in stopping the machine for safety. Is there a reason you need to know what axis was triggered? Question 2: I would connect the common for the switches to the digital ground. All shield should be connected to earth ground of the 220V circuit, unless the ground is too noisy, like in plasma machines where the plasma has an independent earth ground. Earth ground is also connected to the cabinet. Thus, all of the shielding and ground is going to the same place. Shield can also be connected to the digital or DC ground as a second option.
Great Vid, thanks. Regarding proximity switches, I am considering using 2 on each of the X & Y axis, and 1 on the Z axis. Can they both be connected together at the controller input? Cheers.
If you are asking if both X sensors can be connected to one input, the answer is yes. But doing both Y and X on the same input would only be good if you wanted to do limit only.
I used shielded cables on all my switches, and on my motor. Still I am experiencing EMI-issues. I am now converted the connections of my switches to the terminals to an opto coupler situation. Hopefully the issues will be gone.
You can also try completely separating the motor ground from the signal ground. Most controllers have optoisolators to separate the signal grounds on the controllers, so there is no sharing of the higher-powered grounds unless they find their way through your facility or house. Like with plasma, plasmas require a completely separate grounding rod in the earth to mitigate these EMI issues. If your computer, controller, or anything that uses delicate signals, make sure they are also not affixed in any way to the machine's structure where the ground can sneakily get to the signals.
