Queenbee Pro CNC router build part 3: IS IT SAFE!?
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- Опубліковано 13 тра 2021
- For the third installment of the QueenBee Pro router build I finish the electrical panel but mostly I discuss the electrical safety system of my router.
Because what you think is be safe might not be when you apply some knowledge and logic to the problem. You will see links to some of the Parts I've used down below.
And by the way check out my website ohengineering.se/
STEPPERONLINE Stepper Motor Driver 1.0-4.2A 20-50VDC - amzn.to/3bYJeND
STEPPERONLINE Switching Power Supply 115V/230V S-350-36 - amzn.to/3uCu5br
Arduino Nano - amzn.to/3unmehG
Arduino Nano Terminal Adapter Shield (Terminal Adapter 3pcs) - amzn.to/3vu0iTb
MUZHI SPDT Micro Switch 12 Pcs - amzn.to/3yEDQJn
Nema 23 Stepper Motor 4.2A 3.0Nm (425oz.in) - amzn.to/2TfJ8KU
Square Linear Guideway Rail HGH15-1000mm +2Pcs HGH15 - CA Carriage Block - amzn.to/3fJDwQA
C-Beam Linear Rail (40mm x 80mm) (Silver, 1000mm) - amzn.to/3yLIftO
ABB, AF16-30-10-13, 35 Amps, 100-250V AC/DC Coil, IEC Rated Contactor - amzn.to/3fq4QVh
As always, if you like the videos, let me know! If you have any suggestions or questions you van Email me at offhoursengineering@gmail.com or DM me on instagram, @offhoursengineering.
Til next time.
I’m currently building a queenbee pro and your channel has been invaluable my friend, great content and explanation of what you’re doing. Subscribed!
Nice to hear that you like it, thanks!
There will be a Q and A with the most common questions I've gotten so far up in the next week, I'm currently editing the video, so keep an eye out for that.
Thanks for this video about electrical safety. Then I'll know what to do when it'll be time on my queenbee to deal with the electric panel. Probably looking for a different architecture. Using maybe raspberry pi along with linuxCNC instead. But not sure yet. The point here as well is to make sure having all the data transfert away from parasit interference and USB connection between control board and computer is not the best solution. Further more It's good to have the dedicated raspberry for the CNC. Just need to use the desktop of the raspberry in remote from any computer in the house via ssh.
I'd like to go with linuxcnc or a pc based system like Edingcnc in the future as well. But I already had all the hardware for this solution at home so I went with that for now to save some money and get it up and moving.
And I completely agree, USB is not optimal. Both low transfer rates and prone to interference, so proper grounding and shielded cables are a must. In the next video, that will be out next week, I will go over some basic commissioning and greenlining basics as well before powering it up.
@@OffHoursEngineering Sounds à great idea ! By the time I finished mine you will have all think it over.
I end up buying a DDCS V3.1 Controller
I've seen more and more people using them, hope it works well for you.
@@OffHoursEngineering I'll let you know. But the first reason I choose it is to use servo motors with alarm signal that the controller could handle then when a power faillure hapend it save the work in a sd card. Second, all the program and gcode are in the same motion controller. Not depending of a computer which the OS can crash as Well. But that's the same design with GRBL and arduino.
Third It has backlash compensation though not sure It's relevant here with leadscrews driving system compared with Ballscrew.
Do you have a wiring diagram
What do you think about bridging the DC V- to earth ground ? There was a
heated discussion on FB on this. Some of the control technicians
recommend doing this to avoid floating ground and reduce EMI.
I saw that discussion as well and decided to stay out of it. But I kind of fail to see the point of it since the V- and Earth are bridged internally on all SMPS I've seen. And there are usually some form of short circuit protection internally on the the power supply as well that you might render useless if you did. And if you have used a proper star ground on your machine, and your incoming ground is good, then you shouldn't have a floating ground anyways
@@OffHoursEngineering Yeah a lot of immature name calling in the FB discussion. What about a linear unregulated and/or regulated power supply ? I would think there would be some benefit in the unregulated DC supply to the stepper drivers.
Hello again,
I noticed that you did not installe any EMI filters. Is it a deliberate choice or you homited it but did not notice any troubles? It seems the line that supply the arduino needs some filters but could also be nice to put an Emi filter at the power feed of the Spindle to avoid parasits polluating back into the power line.
What do you think? Thanks
I omitted it by choice. Since I am not running a VFD at the moment there isn't much interference. The only possible source of interference is the stepper motors and they are not nearly as bad as a VFD. So far it has worked without a problem for I don't know how many hours. When I upgrade to a VFD I plan to do some testing to see if cable management and grounding is enough or if I need a filter. The only supply to the arduino is the USB from the computer so that is probably the cleanest supply in the entire system :)
Where would you install the EMI filter? Planning to buy a QueenBee Pro and looking for information about everything required for a safety installation. Great video
On the incoming line to the VFD. But it is important understand that a filter would suppress any distortions feeding back from the VFD to the mains but any interference from the motor wires would still be present and might cause problems. So proper grounding and separation of signal and power cables on the machine is still a must. Nice to hear that you like the videos!
Would you recommend adding an EMI filter?
That depends. Many vfd's, more high end ones, have integrated filters. In that case all you need is properly shielded cables and separating the control cables and power cables.
On cheaper vfd's you might need a filter, especially if your incoming ground is bad. And of course shielded cables and separating the power and ground cables as well.
On plasma cutters you will probably also need a filter for the power cord to the plasma cutter, they tend to create some really bad interference.
@@OffHoursEngineering thanks for the reply, I ended up going for the QB pro with xProv5 just to lessen my wiring hope bulkman sends huanyang VFD as shown in their pictures
Can all 4 steppermotor drives be connected to one power supply? ( I have now only one Y steppermotor in my DIY cnc router and if I buy a queenbee or similar there will be 4 steppemotors)
///Thomas
Yes, as long as the power supply can provide enough amps. So if you have 4 stepper motor drivers rates for a max of 5 amps, you will need a power supply that can deliver 5*4=20 amps. If you are planning on running the steppers hard.
But I would suggest that you put individual fuses/mcb's before each driver. This makes troubleshooting easier, you can instantly see which driver that is tripping a breaker for example.
@@OffHoursEngineering Thanks for answer, what 220V fuse do you use to connect to wall power outlet?
Generally a 6 or 10 amp Mini Circuit Breaker (MCB), but it depends on the load and your power supply.
If you have a 6 amp fuse you have around 1320 watts of power and with 10 amp you have 2200w.
In the example with the 5 amp stepper drivers and a 36 volt power supply (almost the same setup I have, except I have 2 power supplies) you would need 5*4*36=720w so a 6amp fuse on the 220 side would be more than enough.
@@OffHoursEngineering Now I understand it, thanks :)
4:19 you show using a novusun 5 axis cnc controller, but you end up using an arduino as a bob.
Do you have a reason for not using the novusun and going with the arduino instead?
I never said I was going to use it. I only used that picture as a reference for what I think is a bad way to implement an emergency stop. I explain this in the video and you can find my reasons for using an Arduino in part 6 of the series, but basically it was the easiest and cheapest option since I already had all the hardware for it and I've used Arduinos a lot for other projects so I know how to work with them.
@@OffHoursEngineering I did eventually see this in vid 5.
I was more wondering as I plan to use that controller bob in my build.
all g
Ok, no problem. But I would do a bit of googling about the novosun controller. I've heard some bad things about them and there have been a couple of threads in "homebuilt CNC machines and projects" group on Facebook, where people ended up ditching them and going with other options.
@@OffHoursEngineering I have experienced the same feedback in my group cnczone, but nobody can expand on what the problems are, seems to come across as a stigma or prejudice toward the unit, the common response is USB interference.
The unit boasts some good features for the price.
I was prompted to ask you how yours was, as I was watching your build as I will be doing my first build in 3-4 weeks noticed you had it in your design in 2nd video.
I am happy with my 6040 with the $15 parallel BOB so my thinking was how bad could that unit be.
All G
I've heard of 2 specific problems beside the usb, and usb works fine if you make sure to limit interference and aren't planning to send to much data since speed is limited.
The first is that I've heard of several boards where the bin file that enables the board to communicate with mach3/4 goes corrupt or disappears, basically bricking the board.
The other one is that there is almost zero support from the Novosun themselves for their own products. But if you're lucky and get a working board, I agree. The features are good for the price.
Hi. Very interesting video. Could you please add a 'real' diagram about the connections from the line, the contactor and the buttons ? I'm not very good on that and i'm afraid about to fry something. I'm sorry but the diagram on the video is not enough for me :-(
Here is a link to the "full" diagram. I have not included any connections to the controller or breakout board. The ground line connected to the DM542T's and limit switches is the signal ground from the controller.
drive.google.com/file/d/1dXbUgpsjdEhYS_lmDHqVYMAanyl21Yxc/view?usp=drivesdk
@@OffHoursEngineering Great. Thanks a lot