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Type: Posts; User: __Britt

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  1. Replies
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    Re: epoxy granite sliding on epoxy granite.

    Thanks... reading it now. :)
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    Re: epoxy granite sliding on epoxy granite.

    Pete - I think you might have already posted it, but - what's your thoughts on a drastically different size ratio; like mixing in pea gravel (or similarly sized crushed granite or quartz or...
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    Re: crane style cnc machine

    You're going to have rigidity problems. I would consider adding a linear actuator of some sort to the far end of the crane arm.

    As for a control, you will need to do some programming to make this...
  4. Re: Wiring manual pulse generator directly to 2nd parallel port

    The disk drive power connectors in the PC will have +5v, +12v, and ground connections on it. You can get a drive power extension cable, clip off the side you don't need, and use that to gain access...
  5. Re: Machine Control Besides Mach and LinuxCNC with stand alone controller.

    Well, FWIW, I'll just throw this into the mix... this is what I've been working on. It's still a work-in-progress, and even when finished won't be appropriate for everybody (is anything ever, though,...
  6. Re: what to do with this 3+ axis dental cnc machine

    Is this on a breadboard? I'm just guessing, but I suspect that the total capacitance (components + stray capacitance from the breadboard itself) might be pushing it into oscillation? According to the...
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    Re: Mach4 trojan warning

    If I were still running a Windows based CNC (I'm not - I'm running custom version of Grbl-Mega), I wouldn't have it on the internet at all - and therefore, wouldn't need anti-virus software on it.
    ...
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    Re: Conduit for the X axis stepper motor

    Well, it's not a Tormach, but for my Shizouka AN-S (really big CNC knee mill) I'm just using regular liquid-tight flex conduit I get at Lowe's or Home Depot.
  9. Re: what to do with this 3+ axis dental cnc machine

    I can't seem to find the datasheet for the TL421... Digikey, Mouser, and Octopart don't turn up anything; and google seems to be under the impression that it's a front-loader for a Kubota tractor.
    ...
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    Re: USB mini female to mini female cable

    USB doesn't have TX and RX; it has D+ and D- lines. It's a differential bi-directional data link.

    https://en.wikipedia.org/wiki/USB
    https://en.wikipedia.org/wiki/USB_hardware
  11. Re: Cold weather affecting proximity sensors?

    I'm just guessing, but perhaps there's a crack in the sensor somewhere (PCB, coil, etc) and when it's cold it shrinks just enough to cause a problem?
  12. Re: PlasmaCam never has worked and new ag teacher

    Given the situation, and the ridiculous price they are charging; I'm thinking that an open-source reference design for a retrofit made from common, inexpensive parts would likely be a useful thing to...
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    Re: DXF instead of G code??

    The short answer: you can't directly feed a DXF to a machine tool. It doesn't contain enough information.

    The long answer: DXF files contain the outlines of a part; but do not contain any...
  14. Re: what to do with this 3+ axis dental cnc machine

    You don't want to know how many PCB "coasters" I've got around here...



    Intermittently wouldn't be recognized properly by the OS; wouldn't be recognized properly by the Arduino IDE (didn't show...
  15. Re: is it possible Clearpath servo's do not provide encoder feedback?

    Note that this is only true in an apples-to-apples comparison. Changing the system topology sometimes requires (or enables) a change in components; the effect of which can overwhelm the effect of the...
  16. Re: Headed To FabTech 2019 in Chicago - Tired of PlasmaCAM

    I know what you mean... not that it helps you, but this is one of the major things that drives me to either open-source solutions, or building my own from scratch.
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    Re: CNC Tube Bender

    As nice as direct-drive servos are; I'd give some thought to using a hydraulic drive; an encoder; and a solenoid valve. I'm suspecting that it may turn out to be lower cost...
  18. Re: what to do with this 3+ axis dental cnc machine

    Eh, no problem. I've actually been a bit busy myself - but with the opposite problem: I spent the weekend driving a tractor around collecting brush & dead tree limbs & piling them in a dumpster so...
  19. Re: what to do with this 3+ axis dental cnc machine

    Um... which SAMD21 dev board did you get?
  20. Re: what to do with this 3+ axis dental cnc machine

    That depends on the chip's input, the noise tolerance & environment it's in, and how fast the edges of the signal need to be. Typically, I start taking a second look at things when I'm seeing values...
  21. Re: what to do with this 3+ axis dental cnc machine

    Yes, but it's also possible to go too far with this and not have enough current going thru it to drive the chip's input; and as the current goes down, noise goes up. Also, do keep in mind that the...
  22. Re: what to do with this 3+ axis dental cnc machine

    Check the voltages with respect to the system ground with a multimeter (and on the encoder connections; be sure to rotate the encoder while watching the meter). For protection, you could put some...
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    Re: controller positioning algorithms ?

    Most CNCs don't have this; and rely on the mechanical parts to be rigid and tight. It's usually only found on higher-end machines; and you won't find that on Aliexpress.



    How many HP (or Watts)...
  24. Re: what to do with this 3+ axis dental cnc machine

    Actually, no - you don't have to go past the switch, you just go up to it; and now you know that you are in "rotation zero" of the ballscrew. Then, go forwards (away from the switch) until the I...
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    Re: controller positioning algorithms ?

    The exact details depend on the controller.

    Most software step-and-direction based controllers that I am aware of fire the step signals simultaneously (or very near to it); with the result that...
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