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Type: Posts; User: andypugh

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  1. Replies
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    FWIW I have been running my moving-knee Harrison...

    FWIW I have been running my moving-knee Harrison without a counterweight for 10 years without issues.

    However, if I wanted a counterbalance I would use a pneumatic cylinder fed by a _relieving_...
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    LinuxCNC 2.8.0 is released

    I am pleased (and a little relieved) to announce the release of LinuxCNC v2.8.0

    This release has been a long time in development. The main new
    feature, the separation of joints (actuators) and...
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    Re: Single Board computer for LinuxCNC

    Ready-to-go SD Card image at: https://www.linuxcnc.org/iso/linuxcnc-2.8.0-pi4.zip
  4. Replies
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    Re: nsk em cn2 pinout

    Found it:
    www.nsk.co.kr/include/download2.jsp?filename=EM%2CEP+ENGLISH+???.pdf

    414244
  5. Replies
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    Re: nsk em cn2 pinout

    Did you have any luck with this? I have the same problem. I found a manual online that has the serial terminal commands, but it does not have the CN2 pinout.
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    Re: Yet another 4th axis build.

    Late reply...

    I do have a spare casting, but posting to Canada would be expensive.
  7. Replies
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    1,218

    Re: Anomally using Pathpilot

    This seems to be a reproducible bug and a tracker (in LinuxCNC) has been created:
    https://github.com/LinuxCNC/linuxcnc/issues/447
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    Re: Yet another 4th axis build.

    My previous dividing head came with an adjustable tailstock, and this head has been sized to be just below the maximum height that that can adjust to.

    Adjustable-height tailstocks are readily...
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    Yet another 4th axis build.

    I have just (nearly) completed a 4th axis for my Harrison milling machine. It is based around one of the Harmonic Drive FHA actuators.
    This is quite a lazy way to do it, they are pretty much a...
  10. Replies
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    Re: Rigid Tapping on a PCNC1100

    You have two quadrature counters.


    This is the external DB25



    And the external DB25 has only the index channel of encoder counter 0 internally connected to a pin (which is wierd). It is...
  11. Replies
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    Re: Rigid Tapping on a PCNC1100

    I can't find an actual manual for mesaflash, but the --help output can be seen in the source code:
    https://github.com/micges/mesaflash/blob/687a445cdbacdc6311f8b0cf056472addd29110a/mesaflash.c#L100...
  12. Replies
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    Re: Rigid Tapping on a PCNC1100

    You might need to make the file executable.

    ls -l

    will give you a long-form file listing, with x in the attributes meaning "executable". You can either use
    chmod +x mesaflash
    or right-click...
  13. Replies
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    22,246

    Re: Rigid Tapping on a PCNC1100

    Interesting indeed. It sort-of suggests that the encoder modules are in there, but are grabbing a pin that another part of the HAL file wants to use.

    Does the mesaflash --readhdmid command that...
  14. Replies
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    22,246

    Re: Rigid Tapping on a PCNC1100

    Just delete the "num_encoders=0" part and see if any appear :-)
  15. Replies
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    22,246

    Re: Rigid Tapping on a PCNC1100

    I was using normal LinuxCNC (and I still am) and the interface is a Mesa 7i43 card in the video. 1000cpr should be no problem at all with the Mesa card encoder counters, if you can find an extra one....
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    Re: Rigid Tapping on a PCNC1100

    Sorry, that was meant to be a link to 25 seconds in, and not a whole embedded video. (because the video, other than the encoder, has no relevance at all to this thread).
    I don't see any way to...
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    Re: Rigid Tapping on a PCNC1100

    Very late with this info, but it would have been fine.
    You can add a B-phase with a second sensor N +/- 0.25 teeth offset round the wheel, and use a deeper slot for index.

    You can see the one I...
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    Re: Harrison Universal Miller Conversion

    I used a long drlll and trusted the existing bore to guide it.


    Yes. Mainly because it amused me


    16mm I think. YOu would need to choose something to suit your machine. And might well not be...
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    Re: Harrison Universal Miller Conversion

    I used silver-steel for the round parts of the ATC gripper and the central rod. The outer tube was some thick-wall hydraulic pipe drilled-out and machined on the OD. The end where he gripper lives...
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    Re: Harrison Universal Miller Conversion

    The 3D model of the parts can be found (and downloade din various formats) from Unsupported Browser ~ A360.
    The bearings are double-row angular contacts, but used and preloaded as single-row....
  21. Thread: BT30 Spindle

    by andypugh
    Replies
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    70,686

    Re: BT30 Spindle

    My drawbar uses a pinching action (because I read that you could damage the bearings). I achieved this with a custom-made air cylinder. ...
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    Re: DC Motor questions - (dummy version)

    You might not need to learn much. I expect that all the power driver electronics is on the PCB, and you just need to apply 24V for it to spin. The 5V and other pins are likely to just be for...
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    Holbrook Minor Lathe CNC Conversion

    I have recently completed the conversion of a Holbrook Minor lathe to CNC.
    The "Minor" is a very solid little lathe, 10x20 capacity but weighing 750kg. The depth of the bed is around 2x the centre...
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    Re: DC Motor questions - (dummy version)

    Images are not coming through here.
    And whilst I know quite a bit about controlling brushless motors, I have not seen that set of pins before.
    What happens with just 24V to +24 and G24?
    What...
  25. Replies
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    Re: DC Motor questions - (dummy version)

    How many wires do the motors have?
  26. Re: Servo CNC conversion of Vertex BS0 dividing head

    I used a NEMA23 sized servo, 24V and rated at something like 0.8Nm. I used it because I had it. It works OK for indexing, gear hobbing and engraving, but I think that it would stall with moderately...
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    Re: analog control in position mode in dyn4

    I did say that it would be unusual, but it is a control mode available with the Dyn4 and seemed to be what the OP was proposing to use.

    In analogue velocity mode, yes. But the Dyn4 drive has...
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    Re: analog control in position mode in dyn4

    Yes, but if you set it up so that 10V == 360 degrees you can only turn the motor one revolution, so can only move 5mm total. If you change the gearing (physical or electronic) so that you can travel...
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    Re: analog control in position mode in dyn4

    Typically you would use a PID controller to control motor position. The drive would be set to velocity mode, and the PID controller sends a velocity command to the drive proportional to the error...
  30. Re: Invitation To Start An Open Source Path Pilot Group

    You can just use a small ballnut. My lathe has been using an 8mm which looks pitiful, but has given to trouble at all:
    http://www.cnczone.com/forums/mini-lathe/63621-cnc-post509784.html#post509784...
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