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Type: Posts; User: __Britt

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  1. 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...
  3. Re: bmk glycidate with cas16648-44-5, apaannn MDP2P pmk glycidate 13605-48-6

    I tried it once... couldn't stand it. Tasted awful; and I found that it was very much psychoactive to me - brought about strong feelings of alarm and agitation.

    So... be careful; and start slow....
  4. 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...
  5. 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...
  6. 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...
  8. 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...
  9. Re: what to do with this 3+ axis dental cnc machine

    Um... which SAMD21 dev board did you get?
  10. 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...
  11. 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...
  12. 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)...
  14. 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...
  16. Re: what to do with this 3+ axis dental cnc machine

    The datasheet doesn't indicate that it can do that.

    From the datasheet:



    So, it looks like that it can control how fast the motor is turning, but not where it's going to - that would have to...
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    Re: 1.5m by 1.5m cnc at rigidity

    "The difference between screwing around and science is writing it down." - Adam Savage. ;)



    I've never used this method (er, not yet - I've got plans, er, schemes, um... crazy notions? for...
  18. Re: what to do with this 3+ axis dental cnc machine

    Nope. No need to for what I do. Also, compatibility (well, ease of use, really) with the standard Arduino workflow is important for anything I intend to release as open-source.

    Now, if I was doing...
  19. Re: what to do with this 3+ axis dental cnc machine

    The official version of Grbl on ARM is not out yet. You'd have to use something like this; which is a 3rd party effort: https://github.com/terjeio/grblHAL

    I have not tried to use it yet; so I...
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    Re: 1.5m by 1.5m cnc at rigidity

    How about using rivet nuts? I'm assuming of course that he can order them & the requisite tool without paying an excessive amount in shipping?
  21. Re: what to do with this 3+ axis dental cnc machine

    Usually, I'll check on octopart.com to see who's got the best deal; and then try to factor in shipping cost. Sometimes it's not worth the savings to make orders from multiple sources if that incurs...
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    Re: Limit switch setup, grbl/candle.

    An Uno will run any volume of G-Code you want - it does it a few lines at a time; and the PC sends the next one when the Uno is ready for it. The issue isn't the volume of G-Code; it's adding new G...
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    Re: Limit switch setup, grbl/candle.

    I would suggest considering getting a Arduino Mega instead of the Uno if you have any interest at all in exploring other versions of Grbl; or adding any features to it.

    If you don't want to mess...
  24. Re: what to do with this 3+ axis dental cnc machine

    OK, looks like there's three system-bus to triple-parallel-port chips; three 12-bit DAC chips (with a parallel bus interface); three RS422 receivers (probably used as the interface to the encoders)...
  25. Re: what to do with this 3+ axis dental cnc machine

    I always check pcbshopper.com; it lists the current prices + shipping from a bunch of PCB manufacturers. Of late, JLC has been the best deal for me here in California; but at your location it may...
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