Re: [CAD_CAM_EDM_DRO] Tangential movement function design

On Thu Jun 10 15:51:42 2004 kdoney_63021 wrote:

>I need to be able to move my Z axis in a rotary direction to maintain
>a tangential perspective to my X and Y motion. Like putting a pizza
>cutter on my Z axis with a moving table design. I need to move the
>cutter in the proper direction (tangent) to the expected motion.
>
>I tried to avoid this complication by using a free floating drag
>knife design but I need to be able to reverse direction immediately
>and the radius on the drag knife is too large.
>
>I can easily attach a rotary axis to my Z and have the movement
>available but I need a general mathematical function for calculating
>the required angle. I was thinking a simple differential equation
>could output the required tangent but I simply have not been able to
>program the function in C to take into account reversal of direction
>or undefined tangents. The ones I have problems with would be like:
>
>last position x=0 y=0
>current position x = 2 y = 1 current Z angle is 33 degrees
>move to x=2 y = 6
>or
>last position x=0 y=0
>current position x = 2 y = 1 current Z angle is 33 degrees
>move to x = -2 y = -6.
>
>Does anyone have the function(s)? They don't have to be in C.

Howdy;

I don't know what OS youi're running, but if it's Linux, you can us the, "bc",
arbitrary calculator language. You can set up named functions in a file, and
then pipe it the function name and numbers on the command line, calling up the
frunction file there as well. I forget what it's called at the moment, but
there's a RPN version of this, too. Just type, "man bc", <return>, and you'll
get the details.

Bill

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