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Type: Posts; User: ubergeekseven

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  1. Re: Inherited a 4x8 machine that has some issues....

    The drivers and the servos will have a specific frequency they should respond to. If you didn't get the control computer with mach configured already with the machine. Maybe the frequency isn't set...
  2. Re: Inherited a 4x8 machine that has some issues....

    Is the signal too fast? Commenting so I get updates on this.

    Sent from my SM-G996U using Tapatalk
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    Re: Z axis inconsistency

    When starting again, do you physically click with the mouse or just hit enter to do it? I ask because I have seen weird things every so often with using enter to verify a prompt. I've just gotten in...
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    Re: Finally...Vertical Al T-Slot build

    I like that setup. Work holding might be frustrating sometimes but, the use of space is great.

    Sent from my SM-G996U using Tapatalk
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    Re: 4th Axis Rotary Accuracy - Problems

    Even if the toothed pulleys are not manufactured correctly? What if the pulley is capable of moving the belt because the belt teeth mesh enough to do that? Or are you saying that as long as the...
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    Re: 4th Axis Rotary Accuracy - Problems

    To check actual output you could model a ruler with 1mm marks. Then, make a cylinder of the same circumference of the rulers linear marks. Project those marks around the cylinder.
    Output to the cnc...
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    Re: 4th Axis Rotary Accuracy - Problems

    Oh ok. I didn't think of how you were measuring the differences previously.
    It's great that you got it figured out.

    Sent from my SM-G996U using Tapatalk
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    Re: 4th Axis Rotary Accuracy - Problems

    I do not think it's a worm gear. It's belt driven from the stepper to a larger gear on the axle.
    Still, backlash could be a small part and I suppose it can multiply at every change.

    What happens...
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    Re: 4th Axis Rotary Accuracy - Problems

    I thought similarly but with micro step settings on the controller. The 90 degree thing and compound issue is something I can't explain with that. Unless full steps work fine for 360 and not for...
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    Re: 4th Axis Rotary Accuracy - Problems

    It's pretty crazy that you can repeatably go to 360 but 90 is off. That would have me obsessed with figuring it out.

    There must be an answer for this specific issue. I am sorry I can't add more...
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    Re: 4th Axis Rotary Accuracy - Problems

    Another thing I didn't ask did you have the issue only when actually doing work with it or also just testing the motion in the pattern you originally mentioned?

    Sent from my SM-G996U using Tapatalk
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    Re: 4th Axis Rotary Accuracy - Problems

    Is the cable for the stepper shielded? Do you have an end stop on it? I use an inductive end stop on mine. Printed a bracket to home it and another bracket that attaches to the chuck back side. I put...
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    Re: 4th Axis Rotary Accuracy - Problems

    You probably need to fine tune the steps per to get a more accurate setting.

    Also, test things with acceleration settings to make sure it isn't skipping at higher movement speeds.

    Sent from my...
  14. Re: Anyone here tried the cheap Chinese harmonic drive 4th and 5th axis off ebay?

    So at $300 or so, you could replace it several times before hitting the cost of a more expensive one that may last longer.
    I do like the idea of using two instead of a tailstock.

    Sent from my...
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    Re: Z axis inconsistency

    Off the top of my head with your macro, it might need to set the offset back to whatever you are using. When ref all happens it is in machine coordinates. You may need to set the work offset back to...
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    Re: Z axis inconsistency

    Mach 3 or 4? I do not have mach 4 so I can't comment on that really.

    In mach 3, sometimes I use some scripts I wrote to do some things. In one script it prompts for input. If I use the entire key...
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    Re: Z axis inconsistency

    Every once in a while during a cut in a series of jobs or every once and a while during the same job?
    If it's between jobs, I could see someone forgetting to set the zero. If working off the same...
  18. Re: Anyone here tried the cheap Chinese harmonic drive 4th and 5th axis off ebay?

    I haven't gone as far as taking it apart so, not sure of the makeup of the gears. I'm also not sure if there is a bearing or of it's directly going to the gears. I took a picture of the attachment...
  19. Re: Anyone here tried the cheap Chinese harmonic drive 4th and 5th axis off ebay?

    Good question. So far, for my purposes, no problems. I suppose the forces in other setups could wear or break the gears. This is 1:100 so the forces would need to be pretty high, I think.

    Sent...
  20. Re: Anyone here tried the cheap Chinese harmonic drive 4th and 5th axis off ebay?

    Here is the way I have mine setup. Aluminum plate and extrusions.https://uploads.tapatalk-cdn.com/20210725/9fbeceb0c95583909975ed8364942dec.jpg

    Sent from my SM-G996U using Tapatalk
  21. Re: Anyone here tried the cheap Chinese harmonic drive 4th and 5th axis off ebay?

    I should also say that the trim vertical pieces I made are around 30 inches in length

    Sent from my SM-G996U using Tapatalk
  22. Re: Anyone here tried the cheap Chinese harmonic drive 4th and 5th axis off ebay?

    I'm using a nema23 stepper. In the way I set it up, the maximum diameter I can use is 8 inches. The length is the width of my table at 48 inches. It could be mounted in the y direction for longer....
  23. Re: Anyone here tried the cheap Chinese harmonic drive 4th and 5th axis off ebay?

    The feedrate is reduced and if too many steps per min are sent it will not move correctly. Off hand, I cannot remember the actual said mine moves but, I can still cut at around 200ipm. Depending on...
  24. Re: Anyone here tried the cheap Chinese harmonic drive 4th and 5th axis off ebay?

    I have the harmonic 4th. Not the 5th. It would great. Amazing holding power and I've never had an issue with losing steps. I added an endstop too. It's a great addition

    Sent from my SM-N960U using...
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    Re: Spindle Question

    That sucks for me. I only bought my spindle less than a year ago...

    Sent from my SM-N960U using Tapatalk
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    Re: Spindle Question

    It is powered by the spindle. It's branded but hard to find much info about the spindle at all. However, I think it could be possible to get a fix. Avid might be able to hook that up through the...
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    Re: Spindle Question

    I could see that balance being off could do that. Are there any small shards stuck to the fan still that could be rubbing?

    On another note, I should figure out a method that does not allow that to...
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    Re: 4th axis touch probing

    Thanks again for this probing macro. I have been using it again lately and sometimes I have some weird issues. half the time I run it, when it goes to probe the z0, it will do it fine and then...
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    Re: 4th axis touch probing

    i just wanted to add the information that I actually use now. Looking back in this post, I never posted what I figured out.
    open config -- toolpath

    Make sure that “A-Rotations Enabled” and “Use...
  30. Re: 2010 Screen set manually setting Z0 after first zero probe

    I found a way around this but, the question about being able to input an actual known location for the auto tool change macro to function correctly, would be great.

    I realized I could find the...
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