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  1. #73
    Community Moderator ger21's Avatar
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    Default Re: Mach 4 Users

    It's snowing here right now....

    Gerry

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  2. #74
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    Default Re: Mach 4 Users

    Quote Originally Posted by ger21 View Post
    It's snowing here right now....
    Yikes!



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    Default Re: Mach 4 Users

    Quote Originally Posted by GME View Post

    I never thought about running 2 motors off of one output, but I understand that phase wires to one are reversed to reverse direction. However, if you wanted to home to 2 separate switches, you couldn't. The two motors would be running off the same signal, so you wouldn't have a master/slave relationship and could home to just one sensor. Auto squaring would not be possible to preserve an already perfect mechanical alignment. (I'm not a fan of correcting mechanical gantry misalignments with auto square.)

    I wonder whether one could reliably count on the two steppers turning on and off in precisely the same position every time, so as to preserve a perfectly squared gantry over time. What about bumping in the gantry on one side when the machine is turned off? Suppose one side is moved out of position .010"? Auto square would, at least in theory, restore perfect alignment. Wouldn't homing to just one switch preserve the induced error? Same sort of problem if there are some lost steps on one side only. Wouldn't homing to one switch preserve the the error vs homing to two switches, which would correct it?
    You should not be doing that anyway build a rigid machine and you only need one home switch for each axes, this works just fine been doing it for years 1 axes 2 motors and you just switch the wires as to what direction you want the motor to run, there are Breakout Boards that are made like this as well DMM has one

    Mactec54


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    Default Re: Mach 4 Users

    Quote Originally Posted by ger21 View Post
    It's snowing here right now....

    My wife's sister and husband live over by Jackson, just got back from Mexico I hope they are not getting it! My John Deere rider, got it out of the shed and it started up on the first try. StayBIL in the gas and a battery charge up in the middle of the winter helps.

    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router


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    Default Re: Mach 4 Users

    I never thought about running 2 motors off of one output, but I understand that phase wires to one are reversed to reverse direction.

    Thats what you do when you Slave a motor. Use the same signal for both motor Drivers. So on the Saturn2 and I assume most large machines with a heavy long Y axis, the other side is Slaved as a "B" on that machine anyway,

    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router


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    Default Re: Mach 4 Users

    Quote Originally Posted by wmgeorge View Post
    I never thought about running 2 motors off of one output, but I understand that phase wires to one are reversed to reverse direction.

    Thats what you do when you Slave a motor. Use the same signal for both motor Drivers. So on the Saturn2 and I assume most large machines with a heavy long Y axis, the other side is Slaved as a "B" on that machine anyway,


    Well, sort of. I'm not sure whether the Y/Slave combination actually runs off of the same signal, but even if it does, the two Y axis motors (Y + A or B) run independently when referencing all home. That was my point. By running two motors off one signal, you lose the ability to home off of 2 switches, which means any induced error will necessarily remain, until detected and fixed. Using two properly adjusted homing switches ensures that induced errors are corrected each time you reference all home.

    Although I've never worked with one of the big, super heavy machines, I suspect that knocking the gantry out alignment isn't something that happens easily. In my shop, which doesn't have an abundance of room around the sides of the CNC, bumping into the gantry is something I can count on. It's happened in the past, and will certainly happen in the future. Also, I suspect that essentially all of the big honkers run servos, which takes care of errors caused by lost steps. My CNC will be about twice the weight and tube size of most kit machines, but as a bolt together aluminum extrusion-based machine, it will never have the same attributes as a commercial machine.




  7. #79
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    Default Re: Mach 4 Users

    I'll have a video up shortly showing the Acorn auto square on my Saturn since I just got the newest firmware update installed a couple days ago.

    For every one that keeps bringing up the lack of inputs and outputs they will be releasing a ethernet expansion board that will have a additional 16 inputs and 16 outputs. So don't shy away from the Acorn thinking it's limited in the capabilities of what you can run.

    I'm still amazed that people are still unsure about the controller, I'm yet to hear from anyone on the Centroid forum that has used it that isn't happy with it once they get their machine set up. Granted for some it's a bit more of a challenge than for others. This was the first cnc build for me and I had zero issues with the Acorn and it only took a couple days to get up and running and making chips. The only reason my build took so long was because Fineline took so long to get me all my parts for the machine. The thing just works and they are aggressively working on new hardware and software updates. I'm personally stoked I made the right decision for my first cnc machine and can't wait till I get my MPG ordered up.



    Dan



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    Default Re: Mach 4 Users

    Quote Originally Posted by Ntl View Post
    I'll have a video up shortly showing the Acorn auto square on my Saturn since I just got the newest firmware update installed a couple days ago.

    For every one that keeps bringing up the lack of inputs and outputs they will be releasing a ethernet expansion board that will have a additional 16 inputs and 16 outputs. So don't shy away from the Acorn thinking it's limited in the capabilities of what you can run.

    I'm still amazed that people are still unsure about the controller, I'm yet to hear from anyone on the Centroid forum that has used it that isn't happy with it once they get their machine set up. Granted for some it's a bit more of a challenge than for others. This was the first cnc build for me and I had zero issues with the Acorn and it only took a couple days to get up and running and making chips. The only reason my build took so long was because Fineline took so long to get me all my parts for the machine. The thing just works and they are aggressively working on new hardware and software updates. I'm personally stoked I made the right decision for my first cnc machine and can't wait till I get my MPG ordered up.



    Dan

    Dan, it's not a question of inputs and output. The issue that keeps coming up is the number of motor control outputs. Not the same thing. I have not heard any news of Acorn expanding from four motor control outputs to six. Let's assume you want to add a rotary axis, which adds a 5th stepper motor. How would you add it to your Acorn? You could definitely do it by running one control circuit to both Y and Y slave and wiring the slave to run in the opposite direction as Y. However, you lose the ability to auto square. You will have to home to just one sensor on Y. Auto square is dependent upon both Y steppers being wired to different motor control outputs. I don't believe you can add a 5th stepper and keep auto square. If I'm wrong, I'd be interested in an explanation of how to do it.

    Don't get the impression I'm knocking Acorn. I haven't run it, and don't know that much about it. When I saw that it only supports 4 steppers and didn't find any indication that it was going to expand to the usual 6, I had all I needed to know about it. I don't yet have a 4th axis (5th stepper), but I want to option to add it if/when I'm ready.

    Gary




  9. #81
    Community Moderator ger21's Avatar
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    Default Re: Mach 4 Users

    For every one that keeps bringing up the lack of inputs and outputs they will be releasing a ethernet expansion board that will have a additional 16 inputs and 16 outputs
    I think this was announced about 6 months ago now?
    Nobody that needs these features is going to buy one and wait for them. When they are released, I'm sure it will bring more people on board.
    And my machine needs 6 motors.

    Gerry

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    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  10. #82
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    Default Re: Mach 4 Users

    And If I was building new I might have used the Acorn. But I did not see the reason for trashing a perfectly good, working system with a tried and true Warp9 ESS control board. As it was I got a modern CNC system for $200 in upgrade cost. Yes having a driver board controlled by a separate control signal yet Slaved lets you use auto correct or whatever to square up that axis. Regardless of how well it was built, accidents and failures happen.

    There from what I can see anyway upgrades and questions on the Acorn as same as the Mach4.

    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router


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