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Type: Posts; User: Mud_

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  1. Thread: Custom kinematic

    by Mud_
    Replies
    10
    Views
    1,366

    Re: Custom kinematic

    I get it, I do this sort of thing professionally. I just want clear answers.

    edited for risk of emoticon misinterpretation...
  2. Thread: Custom kinematic

    by Mud_
    Replies
    10
    Views
    1,366

    Re: Custom kinematic

    Why mince your words? You seem to be saying PlanetCNC are making false claims, but more fool on me for believing them?
  3. Thread: Custom kinematic

    by Mud_
    Replies
    10
    Views
    1,366

    Re: Custom kinematic

    I would hope that if the back end of PlanetCNC is structured to allow assigning motors to joints rather than axes then the user can supply the FK and IK functions which should allow the user to do...
  4. Thread: Custom kinematic

    by Mud_
    Replies
    10
    Views
    1,366

    Re: Custom kinematic

    Sounds promising - do you have a timescale? Can you clarify if this is standard forward/inverse kinematics? Conventional terminology is preferable to the user (kinematic, joints, axes, etc.).
  5. Thread: Custom kinematic

    by Mud_
    Replies
    10
    Views
    1,366

    Re: Custom kinematic

    Can't say I'm not disappointed! Poor form mentioning kinematics in the manual that are not supported. Limited value in a 9 axis board if you would be stuck in joint space.
  6. Thread: Custom kinematic

    by Mud_
    Replies
    10
    Views
    1,366

    Custom kinematic

    Is it possible to have a custom kinematic in planetcnc? Looking at the most recent user manual and digging through the settings it looks like it isn't possible, but used to be? H-bot and delta are...
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    Re: ACS806 and ACM604V60-01-1000 tuning

    Further plot, showing what happens if I try the position loop, even with very low values.
  8. Replies
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    1,788

    ACS806 and ACM604V60-01-1000 tuning

    Hi, I have the ACS806 (V2) driver and ACM604V60-01-1000 servo motor (well, 4 pairs...), and I'm struggling to get started. The current tuning response dips below the purple line (negative current?),...
  9. Re: Epoxy granite - has anyone tested for Young's modulus?

    Ok, news. Yes, as suspected, their quoted modulus is compressive only (though they do not state this). I independently corroborated the test values by updating an FE model. EG is just naff in...
  10. Re: Epoxy granite - has anyone tested for Young's modulus?

    No news, but I share your suspicion.
  11. Re: Epoxy granite - has anyone tested for Young's modulus?

    Hi Goemon, sorry, I disagree - the material property information is useful to the designer. Nonlinearity is pretty negligible in useful machining ranges - most design work is linear and static....
  12. Re: Epoxy granite - has anyone tested for Young's modulus?

    peteeng - I'm awaiting the plots, but good info again, thanks.



    Hi Goemon - if you cannot get even halfway to the specified stiffness result from a trusted EG kit supplier then that is beyond...
  13. Re: Epoxy granite - has anyone tested for Young's modulus?

    No answers yet, but short of them admitting an issue with the supplied materials I don't think anything constructive will result. I may name and shame if it's a lost cause.



    Appreciate the...
  14. Re: Epoxy granite - has anyone tested for Young's modulus?

    I have done the literature search, which is part of why I was surprised by my result - not sure yet if I blame the material family or the supplier.

    The test house should be fine - I've used them...
  15. Re: Epoxy granite - has anyone tested for Young's modulus?

    I suspect they are referring to the force range and possibly the bending jig size as I have seen some very large test setups for civil stuff - my tests were done on a standard lab size Instron, not...
  16. Re: Epoxy granite - has anyone tested for Young's modulus?

    At least I didn't miss an obvious thread then!

    I thought peteeng had focused in on high performance concrete - I hope he does do a comparison :)
  17. Epoxy granite - has anyone tested for Young's modulus?

    Hi all - I am after an impartial sanity check. I was wondering if anyone has done testing for the actual stiffness achieved in your EG builds. I realise this may be rare for hobbyists, but perhaps...
  18. Replies
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    Re: granite cnc upgrade, up and running.

    Yes, indeed, I assume the rollers are very demanding for parallelism and coplanar, though honestly I haven't found the specification yet .

    I was surprised how loose the tolerances appear to be...
  19. Replies
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    1,892

    Re: granite cnc upgrade, up and running.

    Well done Fox, I have been enjoying your videos and great result :)

    I have some similarly monstrous rails for a future build, so have been paying close attention!
  20. Replies
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    Re: Milli a new composite mill kit

    I mean one face of the gantry beam is used for attachment of both the vertical bearing blocks and the rails for motion along the gantry length. This way you only need a single flat surface, and you...
  21. Replies
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    Re: Milli a new composite mill kit

    Why not put the spindle on the other side of the rising gantry? Shared plane between the x and z bearing top faces seems good for manufacture/accuracy. The carriage gets stuck between the pillars,...
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