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Thread: ShopBot mosaics

  1. #21
    Join Date
    Apr 2005
    Location
    Ellettsville, IN
    Posts
    346

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    depth=SQRT((pixvalue*unitlength*un itlength)/(255*4*TAN(halfangle*pi(&# 41;/180)*TAN(halfangle*pi()/180)))

    I went into excel and figured out the equation necessary to calculate vbit cut depth given:

    Unitlength=size of square that the vbit will drill into the center of.

    halfangle=half of the included angle of the bit.

    pixvalue = 0-255 (8 bit gray) where 0=white (no depth) and 255=max depth (circle cut fills whole unit square)

    the pi()/180 on the angle calculations converts from degrees to radians necessary to get the tan function to work right with degree measurements.

  2. #22
    Join Date
    Apr 2005
    Location
    Ellettsville, IN
    Posts
    346

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    Ari,

    I am interested in your python program, in particular, the one that uses a rectangular grid. I'd like to try to modify it to do dots of different sizes for improved contrast using the vbit depth method. If that's ok, can you send it to digitalcarvings@gmail.com?

    thanks,
    John

  3. #23
    Join Date
    Mar 2008
    Location
    , Sunnyvale CA
    Posts
    27

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    email sent

  4. #24
    Join Date
    May 2008
    Location
    Geometree Design, Buffalo NY
    Posts
    44

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    For all the mac users, there is a program that does this type of thing, "Vectoraster". http://www.lostminds.com/content/sho...le=Vectoraster
    It has many variables for shape and size, even fonts and will output an eps. I haven't machined anything with it yet, but its on my list...

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