Help please !!! Servo configuration with stepconf.
True, though for simple non-coordinated moves (i.e. where actuators don't need to work together to move the controlled point) it is possible to use analogue outputs from G-code through a HAL Limit3 block into a PID or stepgen and from there to the drive/motor.
The are G-codes to pause until a digital input is seen, so the code can pause until the actuator gets to the controlled position.
(This is only one way to do it, there are others)
Is it possible to do this during machine run ?
Please Log in or Create an account to join the conversation.
Thanks BigJohnT !
they didn't supply any software to configure the drives but only manual. Is there any site where I can learn about how to tune servo's ?
I've come across some general PID explanations searching the web but nothing would beat the OEM manual which has specifics to that drive even if it is in hieroglyphs which you might have to learn to tune your drives. IIRC generally you slowly increase P till you get oscillation on the servo then increase I a bit to cancel them....
John
Please Log in or Create an account to join the conversation.
I've come across some general PID explanations searching the web but nothing would beat the OEM manual which has specifics to that drive even if it is in hieroglyphs which you might have to learn to tune your drives. IIRC generally you slowly increase P till you get oscillation on the servo then increase I a bit to cancel them....
It means that it's going to take my time. I thought servos are like hooking VFD to induction motors. and program it according to your requirements as per the io specification.
Please Log in or Create an account to join the conversation.
Yes, the position commands would be part of the G-code.Is it possible to do this during machine run ?
Please Log in or Create an account to join the conversation.
Yes, the position commands would be part of the G-code.
Thanks andypugh
I have a question that if I generate g-code from third party CAM software for milling, it needs to be modify ?
Please Log in or Create an account to join the conversation.
I don't think there is any CAM software which handles more than 9 axes (in fact more than 5 axes would be unusual), so you would have to modify the code, yes.
I have a question that if I generate g-code from third party CAM software for milling, it needs to be modify ?Yes, the position commands would be part of the G-code.
For actuators such as part loaders/unloaders the required G-code would probably be inserted as part of a pre-defined pre-amble and tidy-up code configured into the CAM software.
Please Log in or Create an account to join the conversation.
And simultaneously leave another jobs to external PLC. And let's program it separately with Ladder logic and HMI. Which I have already planned.
Let me take advice from you people that if I go for the setup as I planned then with Mitsubishi Q series PLC, I can make 100's of slow moving closed loop axis directly from the IO as it can count encoder pulses very fast and you don't need to have high speed counter for roughly upto 1000pps. And we don't need servos for this purpose as a basic VFD and an induction motor can do these kind of jobs very well.
Second reason is that I can run one PLC throughout my Factory to control these kind of axis in future as I have planning to increase the number of machineries after this one.
Third reason is that it will have separate manual control panel as well for clamping, swapping, placement ect. and these stuff will be done by operators and I have to train them for one thing to run and troubleshoot (which is really easy in case of PLC) and not for entire CNC and g-code.
there may be many misconception about my conclusion as I don't have any experience with CNC. I appreciate your comments. Please.
Please Log in or Create an account to join the conversation.
If we consider simplicity then IMO if g-code needs to be modified manually for more then 5axis (As I have only 5axis CAM) then it's a better and fastest solution to leave the milling job only to LinuxCNC.
It is easier to integrate the CNC and general automation tasks if they are both in LinuxCNC. However, if you want to integrate the automation between different machines then it is probably easier outside LinuxCNC.
ie, I can imagine a master PLC starting multiple LinuxCNC machining centres in a sequence, and in that situation an external PLC makes sense.
There is no reason that you can't consider having both hardware and software PLCs, of course, at different layers in the structure.
The HAL pins exist for individual LinuxCNC instances to report-out their run/stop/pause/auto state to external hardware or to other instances of LinuxCNC, but to be honest separate LinuxCNC instances are not particularly well designed for inter-operation. This is not to say that it can't be done, but it has never been a design requirement.
Note that it is entirely possible to have custom onscreen control panels interacting with software or hardware PLCs entirely separate from the CNC / G-code. The realtime system can run CNC and Classic Ladder (or HAL components, or userspace software) all in parallel.
Personally I would probably start with one PC running LinuxCNC and Classic Ladder, and have that Classic Ladder structure control other LinuxCNC instances as they were added. However that is mainly because I know my way around LinuxCNC/RTAI. if you are more comfortable with PLCs then you might be happier working another way. The only advantage of the Soft PLC is cost, and that there is no reason to use physical IO to communicate between PLC and CNC sections (until other external CNC controllers are added)
With Mesa hardware it is possible to add up to 1536 IO lines per PCI port and control them from LinuxCNC / Classic Ladder.
Please Log in or Create an account to join the conversation.
Note that it is entirely possible to have custom onscreen control panels interacting with software or hardware PLCs entirely separate from the CNC / G-code. The realtime system can run CNC and Classic Ladder (or HAL components, or userspace software) all in parallel.
Here it's the real money saver IMO. Because Mitsubishi HMI components are not cheap and will cost thousands.
Personally I would probably start with one PC running LinuxCNC and Classic Ladder
I am also starting with this. Maybe I am afraid just because of lack of experience with Classicladder. But after some practice with Classicladder, it would be clear to decide in better way. I asked myself many times that are you biased about the system which you can handle and program ? Why don't you try Classicladder. Because in long run simplicity and low cost always wins.
Please Log in or Create an account to join the conversation.
Please Log in or Create an account to join the conversation.