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Type: Posts; User: pippin88

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  1. Replies
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    Re: Fixed Gantry Build

    Peter, a lot of vibration can be due to steppers, but certainly not all.

    Material cutting can induce problem vibrations resulting in chatter and poor surface finish. This is usually much more...
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    30

    Re: Dust Collection Requirements

    To get rid of fine dust (the stuff that actually matters) you need to move a lot of air. 800cfm plus at the tool.

    The CFM ratings on dust collectors are usually grossly overrated and are free air...
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    Re: Looking for Advise / Opinions

    2nd option is VASTLY HUGELY BETTER than round rails.

    I have built machines with both. Would never consider using round rails again.
  4. Replies
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    49

    Re: wire requirements

    Wire can be too small and overheat if current is too high for the wire size.

    Increasing wire size is not a problem except for cost and physical size generally.

    There are many good electricity...
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    Re: wire requirements

    If watts (power) remains the same, then a lower voltage results in higher current.

    Wire size is determined by current, not voltage.

    Higher current needs larger wire size.
  6. Replies
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    Re: MultiCAM MG101 Gutted & Reborn

    Great buy!

    I wouldn't rush into replacing the X leadscrew. What is the pitch/lead?

    A high count servo encoder should provide plenty of resolution.
  7. Replies
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    Re: GME's New 80/20 CNC Build - My Design

    Putting steel rods in is a bad idea.

    Adding weight (mass) is not the answer!

    You need to add stiffness and/or damping.

    Old heavy cast iron machines are good not because they weigh a lot....
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    Re: GME's New 80/20 CNC Build - My Design

    Ways of reducing resonance:
    1. Raise the natural frequency above the operating range
    - increase stiffness
    - decrease mass (without compromising stiffness)
    2. Increase damping
    - passive -...
  9. Replies
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    Re: Steel Gantry Router

    Gantry beam should be 200x200.

    The Z axis induces a torsional force on the gantry. The forces are not just in X, Y and Z.

    Add diagonal bracing within gantry beam. Close the gantry beam ends...
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    Re: CNC machines from plywood

    It is quite possible to build a good plywood CNC.

    Unfortunately your design has many weaknesses.

    It seems the people inevitably start - designing a CNC that looks like they think a CNC router...
  11. Replies
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    13,906

    Re: Designing new Router called Maximus

    Why is the Y axis carriage two separate pieces? (Blue bits in image Max P4-3)
  12. Replies
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    Re: AMAT25LV Basically another PM25 clone :)

    No. 4kg is nothing.
  13. Replies
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    Re: Surface Plates Granite

    Hi,

    It looks like you don't have private messages turned on.

    I'm very interested, but the issue is that I'm away for a full year. If someone wanted to store a plate for me, I would be in!
    ...
  14. Replies
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    225

    Re: 5um vs. 1um linear encoders

    I think it might be worthwhile for screw mapping alone.

    1um scales are cheaper than better accuracy ball screws. Map the screw error and compensate for it (LinuxCNC does screw compensation, though...
  15. Replies
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    1,278

    Re: GME's New 80/20 CNC Build - My Design

    My (limited) understanding was that for VFDs the shield is meant to be connected at both ends.

    For most other purposes it's at the controller box end or vigorously debated.
  16. Re: Student organization looking to build CNC milling machine for school donation

    Or just make the pocket a sliding fit for the nut so that the pocket is the spanner.
  17. Replies
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    1,278

    Re: GME's New 80/20 CNC Build - My Design

    Making cables is I think my last favourite part of building a machine.

    Very hard to find the best combination of came and connector (that is actually available and doesn't require a huge minimum...
  18. Replies
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    155

    Re: Quick question re: threaded wasteboards.

    I have Tee nuts but if I was to do it again, I would probably use standard hex nuts. CNC cut the pockets and through holes and then flip the board and fix it down.

    Tee nuts often don't have a good...
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    Re: Designing new Router called Maximus

    I've lost track of the width of the gantry.

    If it is only 1400mm or so, a ball screw is fine. Just use 10mm plus pitch.
  20. Thread: Concrete VMC

    by pippin88
    Replies
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    8,543

    Re: Concrete VMC

    Great work!

    Are you going to fill in the steel X axis with epoxy granite for damping?
  21. Replies
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    Re: 40mm finnish birch plywood CNC-router

    No, the G540 is not a controller. Breakout boards are not motion controllers.

    The computer software is the controller.
  22. Replies
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    Re: 40mm finnish birch plywood CNC-router

    G540 is not a controller.

    It's a parallel port and 4 stepper drivers in a single package.

    The controller is the bit that actually determines the movement of the machine. For many that is Mach3...
  23. Thread: Concrete VMC

    by pippin88
    Replies
    215
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    8,543

    Re: Concrete VMC

    Looking forward to seeing the results!!!
  24. Replies
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    13,906

    Re: Designing new Router called Maximus

    Regarding your gutter design:

    Have you modelled in the ball screws and nuts? My experience is that the large size of ball nuts often dictates component spacing. E.g 16mm ball nuts are thicker than...
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    13,906

    Re: Designing new Router called Maximus

    Suggestion (you may have already looked at this): model a larger box section for the Z axis whilst keeping the spindle tucked in as close to the gantry as possible.

    Eg a square section rather than...
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