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Type: Posts; User: andy55

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    Cutsim - towards oss cutting-simulator

    Here is the latest update on an open-source cutting simulator called "cutsim"


    https://www.youtube.com/watch?v=aSwDVi8W2XM

    This builds on my work with octrees etc. from 2011 and adds 5-axis...
  2. Poll: Modular is good. For an example of what can be...

    Modular is good. For an example of what can be done, see this project by two Hungarian students/researchers:
    General Mechatronics - Industrial robot controller

    Is the EtherCAT standard open? i.e....
  3. try python. look here: heekscnc - Project...

    try python.
    look here: heekscnc - Project Hosting on Google Code
    as well as here: rs274ngc - Project Hosting on Google Code

    do you have the APT-standard somewhere which defines your input? what...
  4. Thread: EMC2 and CPU

    by andy55
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    All the commercial CAM programs I have seen...

    All the commercial CAM programs I have seen (Mastercam, Surfcam, etc) have filters that combine collinear points into longer lines and detect arcs in the principal planes (XY, XZ, YZ).

    there is a...
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    in general if you have a high-power laser and...

    in general if you have a high-power laser and want to reduce the power output what you do is you put a polarizer in front of it and rotate the polarizer to a suitable angle. This way you can adjust...
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    you want to match the curvature of the cutter to...

    you want to match the curvature of the cutter to the curvature of your part. If you only have vertical walls and 90-degree corners a cylindical endmill is most efficient. For finish-cutting general...
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    The way rigid tapping is done is the Z-axis is...

    The way rigid tapping is done is the Z-axis is "slaved" to the spindle encoder with a certain ratio (to match the feed/rev of the tap).
    So it does not matter very much if the spindle has a certain...
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    if you drive an AC induction motor with a vector...

    if you drive an AC induction motor with a vector type VFD which is able to keep torque up even at low rpm, and you put an encoder on the spindle, then rigid tapping is possible.
  9. anyone found an affordable 2560-pixels wide 30"...

    anyone found an affordable 2560-pixels wide 30" screen yet?
    I'm using 1920-wide 24" monitors, but more pixels is never wrong :)
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    looks like there's a photodiode on the end of the...

    looks like there's a photodiode on the end of the moving arm, and it's measuring how much optical power a light-source, such as an LED, is outputting in each direction.
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    will you be making the lens on a lathe or on a...

    will you be making the lens on a lathe or on a mill?
    what material?

    does your output geometry look something like this?
    http://en.wikipedia.org/wiki/File:Fresnel_lens.svg
  12. Thread: Servo options?

    by andy55
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    if you're the kind of DIY type who wants do do...

    if you're the kind of DIY type who wants do do everything themselves, why not go with EMC2 so you can see the results of tuning on the PC in real-time and monitor the following-error etc etc.

    with...
  13. Thread: EMC2 and CPU

    by andy55
    Replies
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    465

    As sam already mentioned try running the code in...

    As sam already mentioned try running the code in blend mode, i.e. G64P0.01 for example (that would set a blend tolerance of 0.01mm). There is some info here:...
  14. Thread: EMC2 and CPU

    by andy55
    Replies
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    465

    Please try something like this: G0X0Y0 G0X200 ...

    Please try something like this:
    G0X0Y0
    G0X200
    This should move your machine to X=200 at your rapid feed rate
    then try
    G0X0Y0
    G1X200F4000
    This should move your machine to X=200 with a G1...
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    here is an STLReader class in c++ which reads an...

    here is an STLReader class in c++ which reads an STL file (possibly only ASCII, not binary)
    http://code.google.com/p/opencamlib/source/browse/trunk/src/geo/stlreader.cpp
    it should be fairly...
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    this python script should be able to read most...

    this python script should be able to read most STL files:
    http://code.google.com/p/opencamlib/source/browse/trunk/lib/STLTools.py
  17. Thread: EMC2 and CPU

    by andy55
    Replies
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    465

    look at the latency numbers here...

    look at the latency numbers here
    http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Latency-Test
    run the test on your own machine, and see if you get similar numbers, and set your base thread period...
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    a traveling salesman problem solver would be a...

    a traveling salesman problem solver would be a good addition to opencamlib:
    http://code.google.com/p/opencamlib/

    there is a simple TSP solver in the boost-graph library, there should even be...
  19. comp is a tool for writing your own realtime...

    comp is a tool for writing your own realtime components in a C-like language. you could then replace the standard pid-component with your own component.

    see:...
  20. with the old-school hostmot-4 fpga firmware I was...

    with the old-school hostmot-4 fpga firmware I was using this kind of pyVCP test panel to try everything out without PID loops and without EMC2:...
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    did you consider EMC2? It is free, open-source...

    did you consider EMC2? It is free, open-source and you could probably write a GUI for it to do what you want. Unlike most commercial software the inner workings of EMC2 are at least roughly...
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    EMC2 contains a g-code interpreter:...

    EMC2 contains a g-code interpreter:
    http://linuxcnc.org/

    if you have something that reads and parses SVG it should not be so difficult to create G-code where the tool follows the SVG paths...
  23. I guess they are moulds like these:...

    I guess they are moulds like these:
    http://www.bearsbaits.com/Swim-Baits-Jerk-Baits_c_14.html

    I think it will be difficult to get a cnc mould-shop to make you custom designs at prices like you...
  24. Thread: CAM Questions.

    by andy55
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    Take a look at HeeksCAD:...

    Take a look at HeeksCAD:
    http://code.google.com/p/heekscad/
    it is free and open-source, but it's not very complete or bug-free...
    if you are a programmer you can modify/add to it.
    It has 2D...
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    opencamlib has functions for dropping down along...

    opencamlib has functions for dropping down along the z-axis a cutter at a given (x,y) position.
    There's also functions for pushing the cutter into contact with the STL model along the x and y axes....
  26. OpenCAMLib (GPL C++ CAM library with python bindings)

    Hi All,
    after some experimenting in matlab, and some more experimenting in C# with the monocam project, I finally re-wrote the CAM-ideas/algorithms in C++ starting at the beginning of this year. The...
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    what open source license is your code available...

    what open source license is your code available under?

    what algorithm are you using for 2D offsets? pair-wise offset segments/arcs with a second phase where invalid loops are removed? a level-set...
  28. I've bolted a few things to the back of the...

    I've bolted a few things to the back of the electronics cabinet:
    http://www.anderswallin.net/wp-content/uploads/2009/12/cabinet-493x625.jpg

    On the left a Bonmet AC-servodrive (10A continous, ca...
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    steppers want to be run at low rpm, they loose...

    steppers want to be run at low rpm, they loose all torque above some critical rpm, look at the datasheet. You probably want to directly couple the steppers to your lead-screw for this reason. Good...
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    how much money do you want to spend? Do you have...

    how much money do you want to spend? Do you have experience with stepper-motors from previous projects? Are you fitting the machine with ballscrews?
    Brushless servos and drives are cheaper than ever...
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