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Type: Posts; User: Jim Dawson

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  1. Re: Help with Cambam and 3d two sided milling

    I think you need a couple more posts for the images to to be visible.

    If you can, please upload your .cb file. You will most likely have to rename it as a .txt file. I don't remember if the...
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    Re: COVID 19 VENTILATORS ARE EVERYWHERE

    1) It's keeping us off the streets and away from other people so we hopefully stay healthy and don't contribute to the shortages. :)

    2) I'm semi-retired and in the high risk group. Not too much...
  3. Re: CNC Project professional carved! High quality.

    Nice! :cheers:
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    Re: COVID 19 VENTILATORS ARE EVERYWHERE

    Taxslave,

    Mactec54 gave a pretty good list of basic requirements for a ventilator. So my question to you is how you are going to integrate all of the needed analog inputs into a CNC controller...
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    Re: COVID 19 VENTILATORS ARE EVERYWHERE

    I guess it might be a bit difficult to wheel a CNC mill into an intensive care facility. Not to mention that a Windows based PC would be about the last system I would want to use for any critical...
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    Re: COVID 19 VENTILATORS ARE EVERYWHERE

    You are absolutely correct. But in the USA there have been some emergency rules changes for some products that allow non-certified vendors to supply medical equipment. I'm sure this is not a...
  7. Re: Hi, Need some info.. 1 inch tapping, with BT40 holder?

    I thought you might be the same person :)

    I have used a 1/2 air impact wrench for tapping 1-8, but not recommended for production.

    The good news is that the first tool that I linked to is not...
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    Re: COVID 19 VENTILATORS ARE EVERYWHERE

    There is no point in reinventing the wheel. A better use of CNC mills might be to crank up production of ventilator parts or tooling as needed and ship them to a central location for final assembly,...
  9. Re: Hi, Need some info.. 1 inch tapping, with BT40 holder?

    I would not use a tap, requires too much power. I use thread mills. One part I build has a 1-8 threaded hole, 2 inches deep, 6061 aluminum. I do it in one pass with a 2HP spindle.

    Like this one,...
  10. Re: DYN4 Overcurrent, but only on initial startup

    I understand the need to get the servos under control and certainly stop them from faulting on power up. But I wonder if the the E stop/position loss issue is a real problem.

    My normal operation...
  11. Re: DYN4 Overcurrent, but only on initial startup

    You might give rewiring a try and see if it makes a difference. At least it would eliminate one possibility.
  12. Re: DYN4 Overcurrent, but only on initial startup

    I assume pulling the E stop energizes the drive contactors? Do you still have the drive logic wired around the contactors?
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    Re: inserts to machine harden material

    Normally finishing after heat treat is done by grinding or honing.

    Without a lot more information it would be impossible to recommend an insert. I wild guess would be CBN or diamond inserts.
  14. Re: DYN4 Overcurrent, but only on initial startup

    Jerry rigged? Never had a problem on the machine with the linear encoders, it works flawlessly and has for years. That subject was about losing position. That's why I separated the quotes.

    The...
  15. Re: DYN4 Overcurrent, but only on initial startup

    Yes, I am using seperate outputs for the contactors. I have plenty of I/O to spare so I can get away with that.
  16. Re: DYN4 Overcurrent, but only on initial startup

    Not sure if this will help you.

    I have four 1.8KW DMM units on my lathe. All wired with the DMM logic power wired to the contactors for the individual drives, per the normal DMM drawings.

    The...
  17. Re: DYN4 Overcurrent, but only on initial startup

    Maybe with the absolute encoder option. I have no experience with that. This has not been my experience with the incremental encoder. The external encoders that I was referring to are linear...
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    Re: First Time CNC Build

    Given your stated mix of materials, I assume that you are doing jewelry or other artwork and for the most part very light duty use. If you are not in a hurry you might get away with a light duty...
  19. Re: DYN4 Overcurrent, but only on initial startup

    That's interesting. I had my controller powered up and stable and did use a PLC output to control the main drive power contactors. I was powering up the logic from the breaker and used the PLC to...
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    Re: Catalogue/Market for Fusion 360

    Here is a good place to start https://academy.titansofcnc.com/
  21. Re: DYN4 Overcurrent, but only on initial startup

    Please keep us updated on what DMM has to say. I had this problem on two machines.

    EDIT: There is a workaround, but it requires an external encoder.
  22. Re: DYN4 Overcurrent, but only on initial startup

    In the case of the DMM drives I have to disagree with you here. If you power up the the DMM logic (L1,L2) before powering up the R,S,T terminals, the motor can briefly run away or go over current on...
  23. Re: DYN4 Overcurrent, but only on initial startup

    That is a problem. You will lose position on a power fail or other interruption. If your machine is equipped with home switches then it is not a problem to re-home. I have to re-home my lathe...
  24. Re: DYN4 Overcurrent, but only on initial startup

    I had the same problem. The fix is to power up the logic with the drive contactor.
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    Re: Hard drive help, various machines

    Even if the boot sector is hosed, many times you can still get the data off of the drive. If that's not possible and the drive is really dead dead, and you don't have backup copies of the needed...
  26. Re: Does anyone know where to buy tool holder clips for ATC?

    If you need clips, then you have a CNC machine. Why not just make them?
  27. Re: NEED OF URGENT HELP. no. 2007 Al-7 troque alarm

    On my Hardinge, when standing at the left end of the machine the Z axis drive is to the left of the spindle motor. The torque limiting coupling is between the Z axis motor and the ball screw. Not...
  28. Re: Bridge port pulley and timing system modification

    In the Bridgeport J head, the gear is used in low speed, not high speed. High speed is direct drive from the spindle pulley. It would be possible to remove the low speed idler shaft and still run...
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    Re: Measuring Diameter

    Is it not possible to use a mic to measure in the machine? Maybe even a laser mic, but not sure if they make portable ones.
  30. Re: challenges designing a diy y axis lathe

    Your only limitation is in your head :) I have seen your work and have confidence in you. If you can understand the convoluted Mach3 macro systems and actually make it work correctly, then real...
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