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DO NEED LIMIT SWITCHES, IF SO WHAT IS YOUR RECOMMENDATION?
Limit switches are not really needed for this level of a machine, but if you do want to use them, then you will need to connect them with shielded cable and ground the shield at both ends and any other non-used wire in the cable. Limit switches are very susceptible to the motor interference. You will also need to adjust the debounce in the software you will use.
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I used DSP controller for my CNC machine. How can I determine why my CNC machine produce different output as per my requirement. example, i make a design size 10mm x30mm in my design software, now, why is it that my cnc output is15mm x 65 mm?
The DSP controller uses its own pulses per unit (in your case, it's pulses per mm). That number is he same as steps per mm (or steps per inch if you are using that unit). Make sure that the pulses per mm is configured correctly for the machine mechanical components and the mircistep setting on the driver for each axis. Additional Information: You will need to make sure the DSP's parameters match the specifications for motor tuning.
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Hey Patrick where is the video to adjust manufacturers parameters on lasercad? I watched it but can not re-find it. For pulse unit
The latest LaserCAD video that I have is this one: https://www.buildyourcnc.com/tutorials/tutorial-trocen-anywells-lasercad-install I go over adjusting manufacturers parameters at the end of the video. Do you remember another video other than this one? Additional Information: I also have a video where I calibrate each axis. I go deeper into the manufacturers parameters in this video: https://www.youtube.com/watch?v=kLLnLnfIffI Let me know if this helps. Additional Information: I seem to remember one where you did an actual physical measurement to work out the new parameters. Basically the file I put in is coming out much bigger than it should. Also, whenever I reset the settings and put the same values in to double check, it changes them again. Additional Information: I think the one I just added to this question is it. You may have been writing your response while I was adding this video. Additional Information: Yes that is the one. My settings should be very similar to yours, yes? Additional Information: Yes, it will be similar but not exact. If the microstepping is different than mine, the value will be totally different, but that is fine. As long as the nozzle goes where you expect, you will have good X and Y axis values. Remember to do the calibration with point as far apart as possible. That will make the overall calibration much more precise. Additional Information: The file is still coming out bigger than lasercad says. Says its 65mm and its about 3 times that. Also, X axis is a little joggy again. Additional Information: If the travel is 3 times farther, then it's going to be 3 times faster as well, so the motor has reached it's speed limit. The value is in steps/mm, so if you divide the value by the manually, see what happens.
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GREENBULL CABLE
The total cable length for a greenBull 6x is 65 ft. Now the individual cable lengths for the axis, is x=20 ft, y=22 ft, z=23 ft.
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FIRST OF ALL, THANKS FOR DESIGNING A WONDERFUL SITE. MY QUESTION IS: HOW DO YOU CALCULATE EME (ELECTROMAGNETIC EMISSIONS) AROUND THE TRANSMITTER (ANTENNA) AT ANY GIVEN POINT AND WHAT ARE MEASURES TO KEEP IT UNDER SAFETY CODE?
Conceptually it is straightforward to predict the radiofrequency (RF) exposure intensity at any point in the vicinity of a cellular radio base station antenna. Simply multiply the effective radiation power times the inverse square of the distance times the relative gain of the antenna in the direction of the interest. The relative gain in different directions is know as the antenna radiation pattern and is usually available from the antenna manufacturer in graphical or tabular form. Unfortunately, in real life the calculations involved in base station antenna evaluations are quite complex and require expert knowledge and experience to deal with the many parameters that are involved. An excellent reference summarizing this process is the Federal Communications Commission OET Bulletin No. 65 titled "Evaluating Compliance With FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields," available on the Federal Communications Commission (FCC) website. To assess the RF hazards associated with handheld cell phones it is necessary to predict the rate of absorption in the body of radiofrequency energy, a parameter called the specific absorption rate (SAR). This is a very complex calculation, and cell phone manufacturers often rely on measurements of SAR in fluid-filled cylinders or plastic containers in the shape of a head. The FCC requires cell phone manufacturers to provide this data to FCC. You can obtain the data for your model phone on the the FCC's website. Unfortunately only cell phones manufactured in the last couple years are listed here. As to your question about keeping RF exposures within the safety code, please read the other questions posted on this website this matter. Cellular radio products that meet FCC requirements will be within the guidelines established by safety standards organizations for users' and public exposure to RF radiation fields. Gary H. Zeman, ScD, CHP
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i want to install 6 limit switchs and i want to have them on there own pin, i take it that 2 limits each axis gets its own pin and each axis is wired togeather? thanks
You can wire many limit switches on only one pin. You will need to use the NC (Normally Closed) configuration. By using NC, it is like wiring a single wire from the single pin back to ground and when the limit switch is engaged, it breaks the link (like cutting the wire). If you have, say 6 limit switches, then if any one of the switches is engaged, the connection is broken.
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I recently wired my CNC machine with limit switches and tested them before mounting to the machine. They were configured and when tested worked great. After mounting them to the machine, they continued to register as triggered. The frame of the CNC machine is made of MDF so I don't think it is shorting off of the machine. Can you tell me what might be wrong?
We recommend using shield wire for wiring the limit switches.
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How long should it take to build the vertical laser kit?
Assembling the Vertical Laser XL machine will vary depending on your specific abilities. The length of time can be as short as one weekend, or as long as two weeks.
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Hello, Patrick. What focus length do you run on your VLXL? 2.5"?
I current;y use a 2 inch focal length lens in my VLXL.
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do your machine come with touch plate
We can provide a touch plate. It is being developed.
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Do you offer a touch plate kit? If not can a touch plate kit be added to your machines if so whats the process?
Yes, you can add a touch plate kit. A touch plate works just like a limit switch. All you need are alligator clips and a conductive plate. Solder a wire to the conductive plate material and connect that to an IN (input) terminal. Connect the alligator clip to the gnd of the input and then to the end mill. Enable the home setting for the Z axis in Mach3 or Mach4 and use the "ref all home" button to home all of the axes. The z axis will home at the touch plate. Make sure that the touch plate is under the end mill when the z-axis is in the homing process. Here is a tutorial I made a while ago that explains this: https://buildyourcnc.com/PrimeronHomingandLimitSwitches.aspx Let me know what you think by click on the "submit response". Thanks
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So do you need a 24 volt power supply on the USB breakout board or can you use the 5 volt side ?
To use the inputs and outputs on the MAch3 USB controller, you will need at least a 12 VDC power supply inte 24V terminal (V+) and the DCM terminal (V-). The common lead of the limit switch will be connected to DCM (V-) and the NO (Normally Open ) lead of the limit switch will be connected to the Input of your choice (IN1 - IN4).
