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Type: Posts; User: pippin88

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  1. Replies
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    Re: Poll: Acceptable lost steps?

    Zero lost steps.

    If you are losing steps then at some point you will have a major loss of steps and break a bit or waste an important part.

    I used to be in the design it well and open loop...
  2. Re: Deciding the CNC frame for milling large workpeices ?

    Zero chance of what you want.

    There are no off the shelf parts that you can assemble to have a machine that will cut SS with a 1m cutting area.
  3. Re: Chinese G Penny Spindle - anyone tried one?

    Are you sure that it's 460v?

    I can only find 400v listed as three phase for NZ.
  4. Replies
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    Re: Designing a new router called Brevis-HD

    Triangular gantry plus bearings mounted on the diagonal?
  5. Re: z axis mini mill, cutting in between ways?

    I suspect people didn't understand what you were talking about (I didn't).

    How does it perform now?
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    Re: DIY Wood Router Design

    2 rails on each side is a waste.

    The load rating on these things is much more than your machine will generate or tolerate without falling apart.
  7. Replies
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    Re: Designing new Router called Maximus

    Thanks for the details.

    I don't foresee doing infusion myself, will be mixed and poured with the aggregate.

    Do you think the trojan epoxy will be reasonable for mix then add to the mould?
    ...
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    Re: Designing new Router called Maximus

    The Kinetix looks like nice low viscosity resin. Fairly pricey from what I can see of available prices (>$800 for 22.5kg).

    What do you think of the below resins:...
  9. Thread: Mesa

    by pippin88
    Replies
    8
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    55

    Re: Mesa

    Likely to be step/dir signal to the servos as that seems to be the standard for new servos.

    Encoder input will be for linear scales.

    Thinking Delta servos.
  10. Thread: Mesa

    by pippin88
    Replies
    8
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    55

    Re: Mesa

    Rod,

    I will be needing some more Mesa boards in the future and would be happy to support an Aus seller.

    Won't have a firm idea of what I need for a while, but will be something for a ~4 axis...
  11. Replies
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    Re: Fixed gantry or column for mill rigidity?

    JR, the problem with a C frame (what you are referring to as a column mill) is the lever length needed to get decent Y travel.

    If you don't need much Y travel and want lots of Z travel, a C frame...
  12. Replies
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    Re: 150x100cm Steel frame router build

    Chips and dust are not that big of a problem.

    Don't make a weak design just to try to avoid dust.

    Linear bearings have good seals. You can cover them with bellows.

    You should trap the dust...
  13. Replies
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    Re: 150x100cm Steel frame router build

    Your design is much better than flat plates
  14. Re: Why machine rigidity matter that much if the cutter is the least rigid part?

    Yes, you lose the ability to move the spindle up above the bottom of the gantry to allow for longer tools.

    The solution is to make the Z axis plates stiffer. Add ribs.

    Flat plates have no place...
  15. Re: HF 8x14 linear rail conversion....and maybe more...

    LinuxCNC works well with encoder input in many forms.

    Mach3 is hopeless for lathes.
  16. Replies
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    162

    Re: 150x100cm Steel frame router build

    Interesting that so little force is required.

    Do you have a diagram / picture of how you do it?
  17. Replies
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    Re: 150x100cm Steel frame router build

    If you want to cut aluminium I would use the 200x200. The change nearly halves the deflection. Steel is cheap compared to other costs of a build. Do it now when it is easy.

    I can't tell for sure,...
  18. Re: Filling steel tubes with epoxy granite- machine before or after?

    33 to 42 hz is going to be easy to encounter right? If so, we need something to damp the vibrations. Steel alone will not be damp enough.

    I am not a fan of add mass (alone) to increase damping -...
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    Re: 150x100cm Steel frame router build

    Normalising / stress relieving - I haven't found a good answer on whether something will keep moving after machining.

    I believe that most of the movement will happen when you machine the welded...
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    Re: 150x100cm Steel frame router build

    50kg is not an issue at all for two appropriately sized steppers.
    200x200 won't use up any travel, just hang the extra out the back. Travel is determined by your bearing spacing which should be...
  21. Re: Filling steel tubes with epoxy granite- machine before or after?

    Peter, agree for the fixed parts where section size and weight are not an issue. Large EG sections work well for the base and (non moving) columns.

    The question is for moving parts like the...
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    Re: CNC Router - New PC Parallel Port Pickle!

    I moved to LinuxCNC to avoid problems like this. Have not had any ghost in the machine type behaviours on LinuxCNC.
  23. Re: Why machine rigidity matter that much if the cutter is the least rigid part?

    Gantry should be square - 200x200mm. Gravity is not the major force here, cutting is.
  24. Re: Filling steel tubes with epoxy granite- machine before or after?

    Structural Damping Enhancement Via Non-Obstructive Particle Damping Technique

    https://sci-hub.tw/10.1115/1.2930221
  25. Re: Speeds, Feeds, and Strategies for Bench Top Mills

    Using undersize cutters for internal radiuses is optimal. Using metric end mills for imperial parts and vice versa is very useful.
    A 6mm end mill is handy for 1/8" internal radius pocket, instead of...
  26. Re: Why machine rigidity matter that much if the cutter is the least rigid part?

    Post a few more photos and details please.

    Not overkill.
  27. Re: Filling steel tubes with epoxy granite- machine before or after?

    Damping and mechanical properties of composite composed of polyurethane matrix and preplaced aggregates

    https://sci-hub.tw/10.1016/j.conbuildmat.2017.03.233
  28. Re: Filling steel tubes with epoxy granite- machine before or after?

    Characteristics of Polymer Concrete from Pumice Stone and Rubber Thread Waste with Polyurethane as Natural Bonding

    Characteristics of Polymer Concrete from Pumice Stone and Rubber Thread Waste...
  29. Re: Filling steel tubes with epoxy granite- machine before or after?

    Peter, thanks for the paper and product link.

    4" casting thickness on the RenCast 6442 may be a limit.

    A good paper is attached:
    Influence of the addition of styrenebutadiene rubber on the...
  30. Re: Filling steel tubes with epoxy granite- machine before or after?

    Will do once I have some CAD done.

    Brazing is of great interest. I was happy to go down stress relief route, but if it can be avoided that would be excellent!

    In fact I suspect I can use...
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