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Type: Posts; User: JohnZ

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  1. Replies
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    Re: 4th axis as a "poor man's lathe"

    Thank you so much for that information. I kept those power supplies around for a future project like this some day but could not find the info for how to use this model out of the servers.

    What...
  2. Re: Power supply questions for X2 mill CNC conversion

    What changes did you make in the controller config?

    What were the speeds in the Goode vs manual jog?

    There must be a difference between the two… or you may have a wiring issue with your pendant...
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    Re: 4th axis as a "poor man's lathe"

    That is an awesome project.

    I have a few questions...

    How did you separate the negative from the chassis & earth ground.

    I believe there is a sense signal that has to see a small load to...
  4. Re: Power supply questions for X2 mill CNC conversion

    As a quick first step to troubleshooting, if all you swapped out was the controller, would be to duplicate the acceleration and speed settings on the new controller to match the controller from your...
  5. Re: Power supply questions for X2 mill CNC conversion

    Are you using the DM542T drivers from stepperonline or similar from another seller? If so, that controller supports up to 50vdc, so I would use a 48vdc power supply. You will have significantly...
  6. Re: Filled aluminium extrusion frame, good or bad idea?

    Xeno, you really want to listen to Peter. He has done more deep dives into machine design, FEA analysis etc. Than I ever will.

    Once you locate the area of your machine that is screaming with the...
  7. Re: Filled aluminium extrusion frame, good or bad idea?

    As I understand it, filling the central open cavity in the aluminum extrusion will help reduce vibrations, but very little for strength or stiffness.

    Do you have an aluminum plate against the back...
  8. Re: Filled aluminium extrusion frame, good or bad idea?

    First I want to say, very nice clean construction.

    For advice, I'd ask a question... how is both your gantry and table built. From the view provided, we cannot see behind the aluminum plate on...
  9. Re: What are your thoughts on aluminum table vs MDF

    I would keep the aluminum table while continuing to mount a sacrificial spoilboard to its surface and replace that once worn out.

    John Z

    Sent from my SM-G991U using Tapatalk
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    Re: My First CNC Build

    It took me a while staring at the screenshot before I realized that the view was looking up from the bottom in order to see the back plate of the gantry design is deflecting under load.

    Great...
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    Re: My First CNC Build

    For inspiration, read through Jerry's Big Bamboo build thread.

    https://www.cnczone.com/forums/cnc-wood-router-project-log/135232-cnc-software-forum-posts-post1629984.html

    Similar design to what...
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    Re: My First CNC Build

    Let's try the links again, since they did not copy over right last time.
    ...
  13. Replies
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    Re: My First CNC Build

    There has been a lot of discussion with regards to motors and controllers and this combination has come up a lot as an excellent choice.
    ...
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    Re: Input on this new frame

    Yes, I would brace the plates where the ball nuts mount. A single plate connecting all three... both ballnut mounting plates, plus the top plates where the first two connect. Essentially, boxing...
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    Re: Input on this new frame

    On the page linked above, it indicates a thickness of 12-100mm. Is that thin enough to self level, or is it designed to get injected after the engines are installed to fill in all the voids while...
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    Re: DIY CNC Stutter - Intermittent Issue

    I am really glad that the unregulated PS is working good for you. Those Torroidal Power Supplies are awesome, and can absorb momentary surges of current, no sweat. You should never have the machine...
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    Re: Choosing the right stepper motor ?

    Stepper motors generate a lot of back EMF, which increases with the motors RPM. With only 24v fed to the motor controller, you are limiting yourself with regards to max usable rpm of your motors. ...
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    Re: DIY CNC Stutter - Intermittent Issue

    Have you been able to duplicate the stalling with the voltage meter attached?

    Try combining one of your Y motors with the X, and one with your Z motor controllers.

    Since you have both Y motors...
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    Re: Controller Advice Needed

    Joe, was that just for shipping?

    With regards to the formula I used above...

    I believe it was referenced earlier, but I have been going by the information provided by GeckoDrive. They have far...
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    Re: Controller Advice Needed

    One additional item I notice on those two torque curve charts... the bottom chart, see how there is a jump in torque from 24 to 36v, but at 48v, the lines converge at 1050 rpm and the chart stopps...
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    Re: Controller Advice Needed

    The top motor is rated at 3.0 MH while the bottom is 1.85. That being said, the top motor needs 69v to compared to 48v on the lower motor. So, if you ran both at 48v, the top motor is slightly...
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    Re: Controller Advice Needed

    Here is the dampener I mentioned. It mounts to the back shaft on a NEMA 23 motor, but I moved it to the other end of the screw as a thumb-screw for manual adjustment on this machine. (Telescope...
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    Re: Controller Advice Needed

    If the dual shiaft motor is the same specs, go for it. That shaft can support an encoder, or a damper to reduce harmonics or vibrations. I'll get a photo of one I have on an old machine.

    Sent...
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    Re: Controller Advice Needed

    Step frequencies would be the number of pulses needed to turn the motor the number of rotations for the desired speed.

    Example:

    200 step / rotation motor
    1/8 micro step
    1000 rpm max speed
    ...
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    Re: Controller Advice Needed

    That is all excellent information (post #76 above) Craig for the OP and for all reading this thread for what is possible to achieve.

    Sent from my SM-G991U using Tapatalk
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    Re: Controller Advice Needed

    What servos are you using on your project?

    That speed you mention as shaking your 1000kg machine is why I am going with 3:1 reduction. The little servos, reduction, and 2505 ballscrews, at max...
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    Re: Controller Advice Needed

    Yes. I actually have some 3:1 precision planetary gearheads I'm pulling from a couple of THK linear stages where I need to swap to 5:1 or 10:1 heads. With the 3:1 I'd have over 1500 ipm Rapids on...
  28. Thread: A Axis issue

    by JohnZ
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    Re: A Axis issue

    Awesome. I am glad that I was able to assist and that you were able to get your machine moving properly again.

    John Z

    Sent from my SM-G991U using Tapatalk
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    Re: Controller Advice Needed

    Apologies, the urls I posted do not appear correctly. I'm posting from my phone while laying in bed recovering from surgery. [emoji3]


    Cool. I was able to edit the urls directly and fix the...
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    Re: Controller Advice Needed

    I've been looking at the 7i76e.

    Mesa 7I76E link

    It supports 5 axis, spindle control, spindle encoder, and 48 io ports, all from the built in BOB. Additionally it has two sockets accepting...
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