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  1. #13
    Registered
    Join Date
    Aug 2011
    Posts
    957

    Re: Small Portable Machine

    Some progress...
    first video in motion with new integrated closed loop steppers and Planet-CNC controller board. Quite nice to program the steppers/drives via serial port and the motors will recover lost steps if that should happen. I had to reduce the drive current per motor to 2 amps running or 4 amps while accelerating to not exceed my power supply capability. But still pretty good with speeds up to 7000mm/min (280 ipm) and acceleration of 1000 mm/sec^2 (given the low lead screw pitch of 4mm). I think I will leave it at that for now, way more than fast enough for my purpose. But maybe I get a bigger PS with 60V and 12 amps sometimes....

    https://www.dropbox.com/s/h3lpyfltzg..._1224.MOV?dl=0
    Box Joint and Dovetail CAM software here: WWW.TAILMAKER.NET

  2. #14

    Join Date
    Aug 2018
    Posts
    596
    Quote Originally Posted by JerryBurks View Post
    Some progress...
    first video in motion with new integrated closed loop steppers and Planet-CNC controller board. Quite nice to program the steppers/drives via serial port and the motors will recover lost steps if that should happen. I had to reduce the drive current per motor to 2 amps running or 4 amps while accelerating to not exceed my power supply capability. But still pretty good with speeds up to 7000mm/min (280 ipm) and acceleration of 1000 mm/sec^2 (given the low lead screw pitch of 4mm). I think I will leave it at that for now, way more than fast enough for my purpose. But maybe I get a bigger PS with 60V and 12 amps sometimes....

    https://www.dropbox.com/s/h3lpyfltzg..._1224.MOV?dl=0
    Cool little machine looks like you're going to not get board while traveling.

  3. #15
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    Aug 2011
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    957

    Re: Small Portable Machine

    Quote Originally Posted by Ntl View Post
    Cool little machine looks like you're going to not get board while traveling.
    I hope not...
    One problem might be that may run into problems or project needs that I can not take care of with the limited tools and materials to take with me. But let's see. If I get stuck so what...I will just take the kayak and do something else.
    On the upside, I may be able to make some gadgets to mollify camping neighbors and get away with a little noise.
    Box Joint and Dovetail CAM software here: WWW.TAILMAKER.NET

  4. #16
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    Aug 2011
    Posts
    957

    Re: Small Portable Machine

    I noticed (unlike my bigger machine) that the small size makes me run often into the mechanical limits while experimenting.
    Not really a big deal or damage but unpleasant and the closed loop steppers with encoder will continue to try spinning unless I program hard stops at such position errors.
    Oh well, I decided to add limit switches as well and stop such behavior. Was not really planned.

    One concern is that the motor and spindle wiring in the cable drag chains (as it came with the machine) is nice and flexible but all unshielded. Fortunately, the motor wiring for these integrated closed loop steppers does not carry the noisy coil current anymore but only the step and direction signals from the motion controller.
    I would hate to replace all the cables but some tests will tell if that is a problem.
    Box Joint and Dovetail CAM software here: WWW.TAILMAKER.NET

  5. #17
    Gold Member
    Join Date
    May 2005
    Posts
    3811

    Re: Small Portable Machine

    Jerry you would likely get use to those mechanical limits but limit switches are the right move here. The reality is hard crashes are not good for the machine. On the other hand switches mean the loss of a-bit more of your limited travel.

    By the way it looks like you have an interesting variant of this Chinese machine. Looks really nice in the video. As for noise an enclosure might help. You could even throw a cooler over it. Or make a dual purpose crate/box that could fit over the machine yet be useful for packing things.

    One thing that I would like in such a situation is to be able to set up such a machine on a picnic table and to run it as the sun goes down. However being outdoors that would be even less desirable if neighbors are near. Thus a sound enclosure would be of huge benefit. I’m just trying to think of ways to keep your options open.

  6. #18
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    Aug 2011
    Posts
    957

    Re: Small Portable Machine

    Quote Originally Posted by wizard View Post
    Jerry you would likely get use to those mechanical limits but limit switches are the right move here. The reality is hard crashes are not good for the machine. On the other hand switches mean the loss of a-bit more of your limited travel.

    By the way it looks like you have an interesting variant of this Chinese machine. Looks really nice in the video. As for noise an enclosure might help. You could even throw a cooler over it. Or make a dual purpose crate/box that could fit over the machine yet be useful for packing things.

    One thing that I would like in such a situation is to be able to set up such a machine on a picnic table and to run it as the sun goes down. However being outdoors that would be even less desirable if neighbors are near. Thus a sound enclosure would be of huge benefit. I’m just trying to think of ways to keep your options open.
    I have picked the size of this specific machine so that I can install it on a tray with havy-duty drawer slides and just pull it out of the storage compartments of the motorhome. All not finished yet but the drawer is installed and I have a full 1/2" space left in the depth and height so I guess it will work. With that configuration it should not take more than a few minutes to get up and running: Open the storage bin door, slide out the drawer with the machine, plug in power and USB to the PC and cut.

    But now I realize all the other things that I should take with me to support that work. Small folding work bench, ROS, jig saw, battery drill and a bunch of hand tools come to mind. Great that the motorhome has a lot of storage space...
    Box Joint and Dovetail CAM software here: WWW.TAILMAKER.NET

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