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Type: Posts; User: reg.miller

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  1. Replies
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    Re: CADs for free comparison

    Thanks, very nice results.

    I looked at Blender but the examples I was following were for 3D printing and put the Blender model through a slicer. I never found out how I could get cnc tool paths....
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    Re: CADs for free comparison

    Thanks, you certainly seems to have mastered using blender. I particularly like the head.

    How do you get tool paths once you have the 3D model?
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    Re: chinese VFD blow out

    Thanks for the reply. The soot marks inside the connector body indicate one phase shorted to ground. This is also borne out by the fact the differential trips went as well as the current trip. Pin4...
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    Re: chinese VFD blow out

    Thanks, I have opened the VFD and it appears that one of a pair of high power wound resistors was getting hot and melted the plastic casing of an adjacent relay. I think I got there quick enough...
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    chinese VFD blow out

    Hi,

    I am finishing a self designed CNC mill. It has a chinese spindle and 2.2kW Huanyang VFD bought as a pair.

    Basic testing has been going well and I wanted to make an aluminium piece to...
  6. Thread: ice ages

    by reg.miller
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    916

    Re: ice ages

    There is no one "natural state" of the Earth as we know from geological history. Anyone who thinks the temperature of whatever year is what global temp. "should be" is denying climate changes...
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    Re: VFD control voltage

    thanks for your thoughts John. I have no reason to doubt the software, it's pretty straightforward and I've checked it.

    I removed the RC filter, I think the VFD must have enough internal...
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    Re: VFD control voltage

    He was suggesting amplifying the linear 0-8V part of the range to 0-10V . Then adjusting the software to produce 8V for max rpm.

    That is a valid solution but I do not have room to add an extra op...
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    Re: VFD control voltage

    Ok I see what you were suggesting now.

    My aim is understand where I'm going wrong rather than hack it without understanding.
    From the voltage drop on R9 it looks like the i/p resistance of VFD is...
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    Re: VFD control voltage

    Thanks John, I do not think this has anything to do with GRBL, I just put that to give a bit of context. The software sets the duty cycle of the PWM as a linear % of the full range. I have not...
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    VFD control voltage

    Hi,

    I have a chinese 2kW 3 phase inverter driven spindle, bought as a pair. The VFD takes either manual speed setting or on i/p voltage.

    It provides a 10V supply which it seems is intended...
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    Re: Cambam limitations.

    OK, thanks for the input Jim, that saves a lot of time. It looks like FreeCAD maybe ahead of CamBam then, at least in terms SVG capabilities.

    I'm trying to avoid fusion for two reasons. It only...
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    Re: Cambam limitations.

    Thanks Jim.

    One thing I'm interested in doing is importing SVG graphics for engraving and 2.5D bas-relief wood sculpting. Have you any experience doing that with CamBam?

    Also how well does it...
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    Cambam limitations.

    Hi,

    I have been working with FreeCAD for a while but aside from teething problems, I think it is still quite a way from being finished and many rather basic features are not yet implemented. Its...
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    Re: squeaky chinese spindle.

    @wmgeorge:
    sorry, looking back what I wrote was incorrect. 50Hz was the minimum starting freq. , it stabilised at 400Hz.



    Thanks Gerry, I'll check tomorrow. The workshop is shut now.

    It...
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    squeaky chinese spindle.

    Hi, I am just powering up the spindle for the first time on my self-designed CNC milling machine.

    I bought a 2kW water-cooled, chinese VFS and spindle. I have a provisional clamping and water cct...
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    Re: CADs for free comparison

    Yeah, Blender is a monster to learn, but ultimately probably worth the effort.

    There are a few guides on this site which show you how to model involute gears ( properly ) and even hypoid bevel...
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    Re: machine alignment / set-up

    Thanks for the Grizzly link. That's a pretty good price, though they'd probably want as much again to send overseas if they accept non US orders at all. I'll give them a call.
    I will have to...
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    Re: machine alignment / set-up

    Well I have already measured the sagging in these X guide bars with a dial gauge as the weight of the gantry moving. The gantry is large section ali extrusion so over the length I doubt that will sag...
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    Re: What type bits for routing PCBs?

    Wow, that is pure magic to watch. Thanks, If I can cut half a good as that I'll be happy.
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    machine alignment / set-up

    Hi,

    I have build a CNC milling machine and I'm nearing the stage of putting it in it's final installation position and starting to level it all up and set the axis perpendicularity etc.

    Until...
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    Re: opto-isolator and PWM speed control.

    For anyone interested, here is what I settled on. Works well, following skrubol's suggestion of doing it the other way up. ;)

    418296
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    Re: opto-isolator and PWM speed control.

    Yes, using an opto like FOB817B provides both level shift and galvanic isolation in simple cheap and compact way. A four pin dil with minimal additional components.
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    Re: opto-isolator and PWM speed control.

    The opto is on the same cct board as the MPU and the input if configured with a pull-up. That does leave the question of what happens if the spindle controller is power on but the Gcode interpretter...
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    Re: opto-isolator and PWM speed control.

    Thanks, could you explain the reason that should be done?
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