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Forum Index : Microcontroller and PC projects : CGCOLORMAX2-B to Sherline CNC Controller for milling machine
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| PhenixRising Guru  Joined: 07/11/2023 Location: United KingdomPosts: 857 |
GRBL...Awesome because nobody needs: -Backlash compensation -Rigid tapping -Threading -Closed loop servo control -Tool compensation (not just length but diameter as well) -Tool table -Multiple work coordinate systems -Automatic tool changer -Automatic tool length measurement -Probing -Absolute encoders (never need to home) Anyway.  |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2135 |
Getting back to the OP, does he need all that? Is he setting up an automated factory or is it a small scale hobby setup? |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
He never reappeared so now I'm getting carried away with what Bryan1 proposed For me, GRBL is a toy. How does it qualify as "control" when it runs totally blind. It's CNHAH (computer numerical hit and hope) |
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| allie Newbie  Joined: 06/10/2018 Location: CanadaPosts: 33 |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4223 |
Maybe I am not into 3D machining as most of you, but as far as I know the workflow is as follows 1/ a design is created 2/ machining files are generated 3/ the machine file is sent to the cnc machine 4/ the machine executes the instructions 1,2 are outside the capabilities for a cmm2, this is the terrain of pc’s 3 is doable by cmm2, but also CMM1 or picomite 4 is best performed by well designed machine control processors, such as GRBL Volhout PicomiteVGA PETSCII ROBOTS |
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Bryan1 Guru Joined: 22/02/2006 Location: AustraliaPosts: 1344 |
But when in camera mode both 1 and 2 can be generated by the CMM2 so reading the input can be logged to file which can be run. For me it will be fun making the probe which can be the first step to life where what is captured is then made using the CMM2. Also the jog feature for each axis which can help on the calibration of each axis. Now to make this open source I do need to know how to start a github setup then the CMM2 CNC wiki can start. Cheers Bryan |
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| IanT Regular Member  Joined: 29/11/2016 Location: United KingdomPosts: 86 |
Yes, this is correct Volhout. 1/ It might be possible to create a simple CAD system using MMB but I will stick with Solid Edge in the meantime 2/ Depends on exactly what you are trying to do but there are many CAM options out the for 2D, 2.5D and 3D machining but again Fusion 360 will probably have to do for now 4/ My CNC has GRBL running on a 32bit cpu and it seems fine - so no needs there either. What I would certainly welcome is a solution in area 3/ My WM3020 doesn't come with an 'off-line' controller (unlike most 3D printers), so the PC needs to be connected to run the G-code sender (typically UGS or Candle). However a simple Jog control and G-code sender should be well within the capability of a PicoMite or anything faster like the CMM2. I suspect it won't be me doing it, so I'll wait in hope! :-) Interesting thread though... Regards, IanT |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
No experience with this but I keep seeing it. Edited 2024-04-14 19:22 by PhenixRising |
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| Bryan1 Guru Joined: 22/02/2006 Location: AustraliaPosts: 1344 |
Here is a question if the CMM2 can read a G-Code file then it would be a simple load procedure then run the file. So 1&2 are done outside the CMM2 then simply put on the SDCard so they can be loaded. Now in camera getting that image to reproduce that was captured by the input then running the file. Now on the interface of this design I do think a controller board needs to be made so the connector out of the CMM2 has full control of what goes on. Just like those old boards and in fact I do still the original parallel port controller from when I got this cnc going. So that will find the pin assignments on the old controller so that is an option. Then it will bring back the 32 bit days when my cnc worked and Mac3 ruled the day but now we have a CMM2 and that has a brain to handle the challenge a wiki is needed as this is huge task to complete. |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
Don't know if the attached could be a useful reference but... pscnc.zip pathlib4.zip Edited 2024-04-14 20:48 by PhenixRising |
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| allie Newbie Joined: 06/10/2018 Location: CanadaPosts: 33 |
I have the CGCOLORMAX2-B with (3) 5 volt relays wired to 3 axis on the milling machine stepper motors to be controlled by one SHERLINE Linear Controller. All works good with MMBASIC to choose which axis I want to use by turning on a relay for one axis at a given time. What I need to know is what step pulse (width) do I need to advance the SHERLINE Controller to move one step. I know I need 2 signals for step and direction. Direction is easy either a + or - signal meaning 3.3 or 0 volts for direction. The width of the Step in milliseconds is the question for step to work on the SHERLINE Controller for it to advance one step. I did some math and it came out that 8 steps will move the Mill or Lath Axis X,Y,Z to one thousands of an inch. I have two testers hooked now on the Colormaximite2gen2 with programs running to generate the step signal in milliseconds. I Have the Parallax Propeller Scope and the Saleae Logic 8 to see the signals coming from Colormaximite2gen2. All looks good. I also programmed the Colormaximite2gen2 to output a pulse out on pin 33 and put that pulse back into the Colormaximite2gen2 into pin 18(fast count). The pulse that I output on pin 33 is the same width of the pulse that I put out on pin 32 that will go to the SHERLINE CNC CONTROLLER'S STEP IN. I'm using the COLORMAXIMITE2GEN2'S FREQIN and print it to the screen to verify that I have my other SCOPE and LOGIC 8 settings set up right. All is good. Now I can play around with the millisecond numbers to see which works the best. Then I'll work on the speed for ramping up and running the stepper motors. Best regards allie. |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4223 |
Allie, Mechanical relays to communicate step pulses may not be very fast, unless you happen to have reed contacts. Most relays will barely reach 60hz on-off-on cycle. Can your shearling controller accept opto couplers to control the step input. Volhout Edited 2024-04-15 01:37 by Volhout PicomiteVGA PETSCII ROBOTS |
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| allie Newbie Joined: 06/10/2018 Location: CanadaPosts: 33 |
I know. I only need one of the 3 relays to turn on at a time. (ie) If I want the X AXIS to move I turn on relay X, Y AXIS is Y relay, Z AXIS is Z relay. The relays are four pole all four poles turn on at the same time. If I want the X AXIS to move 8 inches that X AXIS relay stays on until the 8 inches has moved. Then the next AXIS will turn on and so on. The SHERLINE CNC CONTROLLER through the step input controls the 4 signals going to the stepper motor coils through it's four input wires. The only signals the CGCOLORMAX2-B needs to send is the step signal and the direction signal. I have the COLORMAXIMITE2GEN2 interfaced to the CGCOLORMAX2-B. I chose this way because the CGCOLORMAX2-B has through holes on their board to add my relays and the L293D to turn on the relays. The COLORMAXIMITE2GEN2 will tell the CGCOLORMAX2-B which relay to turn on then the COLORMAXIMITE2GEN2 will output the step pulse and direction to the SHERLINE CNC CONTROLLER. regards allie |
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| allie Newbie Joined: 06/10/2018 Location: CanadaPosts: 33 |
I said first in the last post that the CGCOLORMAX2-B will send out the step and direction than I said the COLORMAXIMITE2GEN2 will send out the step and direction which will be the one that does. Sorry for the misprint. regards Allie |
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| IanT Regular Member Joined: 29/11/2016 Location: United KingdomPosts: 86 |
I'd not thought to look beyond UGS & Candle P-R, so I hadn't seen this. Thank you. I'll have a closer look when I get some time (but the feature summary looks very useful) I've only just recently started thinking about using my (Android) phone with 'Mites, when I started playing with the WebMite, using the 'Serial WiFi Terminal' app. I've also just purchased a couple of HC-06's to look at Bluetooth R/C of my small (3D printed) model locomotives. I've got them running with PicoMite IR controls at the moment, using a cheap TV controller, which is great for my Grandson to play with. I'll be using 'Serial Bluetooth Terminal' for this, at least to begin with, which is by the same developer. I've found his WiFi app very useful and I hope that the BT version will be similar in it's utility. Anyway, thanks very much for the suggestion. A 'Mobile' does seem an obvious way to go for simple control applications that don't need too much in the way of graphic feedback or controller 'intelligence' (at last for someone with my limited skill set & free time). Regards, IanT |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
@IanT Android->Mite is child's play with Bluetooth. For the Mite, it's just reading/writing to a com-port. No different to hard-wiring. |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
@IanT You can be up and Bluetoothing in minutes. |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
"Ramping up" Especially for steppers, better to use proper S-Curve accel/decel. Sample for accel: dim as integer res,samptime dim as float f,intspeed,ramp_segments,frac ramp_segments = 1/1000 res = 1000 sync 2,M do inc samptime,2 sync frac = samptime*ramp_segments f=(3-2*frac)*frac^2 intspeed = f * 5000 print samptime, intspeed loop until samptime=>res |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4223 |
Hi Phoenix, I feel this is expandable tp 3 axis. As long as your mmbasic loop is significantly faster than the granularity of the s curves. Volhout PicomiteVGA PETSCII ROBOTS |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
Oh sure. It takes 54µS on the Pico in a 2000µS window. Alternatively, it can be pre-calc'd prior to execution. |
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