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Openbuilds 4x8 cnc

Discussion in 'CNC Mills/Routers' started by Sam Keller, Aug 14, 2020.

Openbuilds 4x8 cnc

Openbuilds 4x8 cnc

Discussion in 'CNC Mills/Routers' started by Sam Keller, Aug 14, 2020.

I built this cnc using 2 z axis actuators thinking it would minimize deflection and it seems to be very sturdy. I used 2 1500mm c channels for my x axis, 1 1500mm c channel for my y axis, nema 23 stepper motors, dm556 drivers, 2 24v power supplies, smc5-5-n-n controller, 9mm wide belts, and the Hitachi m12vc router. So far it's working very well with a few hiccups. Programming the controller was a learning experience but I'm very happy with it.

4x8 cnc
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  1. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Giarc's reply stands as per above
     
    #91 Peter Van Der Walt, Oct 1, 2020
  2. NickEng

    NickEng Well-Known
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    Peter, are you saying that the black box will not handle chucks setup?
     
    #92 NickEng, Oct 1, 2020
  3. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    BlackBox is rated 4A Max per driver, running two x 4.2A motors one one driver- not ideal
    Replacing the motors with our NEMA23s I would say he'd be fine running the two Z-motors in paralel, but his current motors are too big:

     
    #93 Peter Van Der Walt, Oct 1, 2020
  4. NickEng

    NickEng Well-Known
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    I assume the “nema23s” motors that you sell have a lower amperage draw? Could you provide a link to this motor?
    Thanks.
     
    #94 NickEng, Oct 1, 2020
  5. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Yes. 2.8a, but also low inductance, low coil voltage, many many hours of testing running on a BlackBox also in parallel. See OpenBuildsPartstore.com or click the red link above on the menu bar
     
    #95 Peter Van Der Walt, Oct 1, 2020
  6. chuck english

    chuck english New
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    best I can figure the nema23s from openbuilds are 3.0A. Running 2 of those on the 4A max per driver is ok?
     
    #96 chuck english, Oct 1, 2020
  7. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    The high torques are 3A. The regular ones are 2.8a
     
    #97 Peter Van Der Walt, Oct 1, 2020
  8. chuck english

    chuck english New
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    sorry,
    just saw your post Peter. So they are 2.8. So I can run the three 4.2A and then parallel the 2 nema 23s from openbuilds?

    so I need to send back the high torque and get regular?

    I'm sure I didn't make myself very clear. Sorry. I have 2 openbuilts high torque stepper motors and 3 from another source. The 3 are 4.2A. Can I run the 3 that are 4.2A and the 2 from openbuilds that are 3A in parallel or do I need to swap these for the regular ones?
     
    #98 chuck english, Oct 1, 2020
    Last edited by a moderator: Oct 1, 2020
  9. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    It will probably still be underpowering the 4.2As a little but as you already have them, try it. If it an issue, you can address it then

    Same for the high torques, they'll work (and you already have them), but as their torque curve is further up on the current scale compared to the normal motors, with the same current setting, the regular ones would have performed a little better
     
    #99 Peter Van Der Walt, Oct 1, 2020
  10. chuck english

    chuck english New
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    thanks for help Peter
     
    #100 chuck english, Oct 1, 2020
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  11. chuck english

    chuck english New
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    Sam,
    Well, believe it or not, I'm up and running. KINDA. Many thanks to you. Did my trail run openbuilds HELLO WORLD. Seemed to work but apparently my machine is dyslexic. It cut backwards. I'm sure thats something (I HOPE) is pretty simple you or one of the guys can help me with. Also, very slow and I'm not sure where setting is to increase speed. Thanks all.
     
    #101 chuck english, Oct 6, 2020
  12. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Very easy: Flip the switch on any axis that needs to go the other way

    upload_2020-10-6_20-19-59.png
     
    #102 Peter Van Der Walt, Oct 6, 2020
  13. chuck english

    chuck english New
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    I don't have an image on open builds control when I transfer it from openbuilds Gcoder? I probably hit the wrong button somewhere and can't figure it out. Where is setting to change which bit you are using? Thanks
     
    #103 chuck english, Oct 7, 2020
  14. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Do you have a 3D viewer tab (if not either your PC doesnt support WebGL, or you turned off the 3D viewer in Troubleshooting > Application Diagnostics

    upload_2020-10-7_12-12-8.png




    In the toolpath parameters


    upload_2020-10-7_12-12-28.png
     
    #104 Peter Van Der Walt, Oct 7, 2020
  15. chuck english

    chuck english New
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    Thanks Peter,
    I'm pretty sure I had an image, so I probably turned it off. Thanks for help..
     
    #105 chuck english, Oct 7, 2020
  16. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Troubleshooting tab > Application diagnostics allows you to enable/disable features


    upload_2020-10-7_12-16-1.png
     
    #106 Peter Van Der Walt, Oct 7, 2020
    Sam Keller likes this.
  17. firelife15

    firelife15 New
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    Table looks great. My machine is very top heavy. Seems like you fixed that by bringing everything low and close.
    I was curious to where you found your dust collection head for the router?

    Thanks.

    Brooks Nelson
     
    #107 firelife15, Oct 20, 2020
  18. Sam Keller

    Sam Keller Well-Known
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    #108 Sam Keller, Oct 20, 2020
  19. Jesal

    Jesal New
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    Great job on this, awesome build Sam.
    Can you please share your experience with the SMC5?
    Is it pretty easy to figure out and use?
    How does it compare to the other controllers you've used?
    Thanks
     
    #109 Jesal, Oct 29, 2020
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  20. Sam Keller

    Sam Keller Well-Known
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    The only thing I don't like about the SMC5 controller is that you can not have a slave drive. I wanted to have separate outputs for all my motors so I could have separate homing switches for each one and make my gantries self squaring but I don't think you can do that with this controller or I haven't found out how to yet. I would have bought a different one. With that said, everything else works great. It was easy enough to set up, no documentation but got thru it with a couple of YouTube videos. I like using it better than UGS on my computer like my last cnc.
     
    #110 Sam Keller, Oct 29, 2020
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  21. Jesal

    Jesal New
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    Thanks Sam, I'll check out the YouTube videos. Just looking to simplify, I have the blackbox now. It'll be great if I can get rid of the pc/monitor/keyboard and go with an all in one solution like SMC5.
     
    #111 Jesal, Oct 29, 2020
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  22. Jesal

    Jesal New
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    Sorry Sam, I don't understand the need to slave a drive. You have 5 motors and 5 axis controller. I thought that is all you need. Can you please explain what's missing for us newbies? What controller are you looking at, if you plan to upgrade later... Thank you.
     
    #112 Jesal, Oct 29, 2020
  23. Sam Keller

    Sam Keller Well-Known
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    I'm no expert here either... So I have 5 outputs xyzab, if i connect one motor to the z output and the other motor to the A output you have to tell the controller that z and a are the same axis which is a slave or clone drive. I haven't found how to do that with this controller. In mach3 and others there are options for that. I haven't really looked into it more yet since i got it working by hooking up both z drivers to the z output and hooking up both x drivers to the x output and then wiring the second x motor opposite so it will run the opposite direction. I'm thinking of getting a rotory axis anyway so I'll need one if those outputs for that. I'll prob just stay with this controller and manually squaring the gantry is easy.
     
    #113 Sam Keller, Oct 29, 2020
    Last edited: Oct 29, 2020
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  24. Jesal

    Jesal New
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    Just getting into CNC recently and learning as much as I can. YouTube overload :) I mistakenly thought that auto squaring can't be done with slaved motors and have to be independent. Thanks for the explanation
     
    #114 Jesal, Oct 29, 2020
  25. JustinTime

    JustinTime Veteran
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    Except for the initial setup you shouldn't have to square the gantry anymore. If you do I think you have some problems with your setup. I don't have to square my gantry and I have 2 steppers on the Y axis. Even the initial setup I did using a measuring tape and it came out darn precise, if I may say so myself. :)
     
    #115 JustinTime, Oct 30, 2020
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  26. chuck english

    chuck english New
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    Hey Sam
    What speed and feeds are you using to cut medium hard wood? Soft maple maybe
     
    #116 chuck english, Oct 30, 2020
  27. Sam Keller

    Sam Keller Well-Known
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    I'm not 100% sure on how to do it, I think a slave motor is more independent than 2 motors spliced to the same output. I didn't look into it any further after I couldn't slave the motors
     
    #117 Sam Keller, Oct 30, 2020
  28. Sam Keller

    Sam Keller Well-Known
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    I usually start at 100 ipm and slow it down or speed it up when appropriate. I try not to push it too fast because on my last cnc bad things happen if you run too fast and too deep.
     
    #118 Sam Keller, Oct 30, 2020
  29. Sam Keller

    Sam Keller Well-Known
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    Ya I don't have to square it most the time, only if I change a bit when it's turned off and the gantry moves. There is a small amount of movement between the 2 gantries when the motors are not on.
     
    #119 Sam Keller, Oct 30, 2020
  30. JustinTime

    JustinTime Veteran
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    My bad, I didn't check your build article or I would have seen that you use timing belts. I use ACME rods and they don't move even if you try hard to push on one side of the gantry.
     
    #120 JustinTime, Oct 31, 2020
    Sam Keller likes this.
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