Re: [CAD_CAM_EDM_DRO] DRO questions

Hans Wedemeyer wrote:

>
> Jan,
> OK I understand, but just how would you determine that X,Y is correct without
> first having entered data for it... ? Entering data by the DRO keyboard has to be
> cumbersome and error prone.
> Anyway, I'm planning to allow the user to upload a file of X,Y coords. to the DRO.

Hans:

Here is the step by step way a bolt circle is done on a commercial
DRO:

#1 Position the mill in the center of the hole, hit reset
the DRO now says 0.0000 , 0.0000

#2 Go to the first bolt circle hole (usually straight up or down in Y,
or straight left or right in X), whereupon one of the scales reads the
radius. If not, go to an X,Y on the drawing (offset from the center)
and the radius is sqrt (x^2 + y^2) but the human doesn't worry about
that, the DRO just uses this info to get the radius

#3 Enter the number of holes (say 5). Then you hit "next"

#4 The DRO now says (X,Y) and you handcrank it over to
0.0000, 0.0000 (or close to that).

#5 Then you drill, then you hit "next"
Loop back to #4 as many times as it takes (5 holes in this example).

From beginning to end it takes maybe 30 seconds plus the time it takes
to physically drill the hole. Time is ticking. The boss is watching,
you have 70 more of these to do before lunchtime.....

Hans, contact me offline and I'll give you the source code for the
math (sines and cosines and all that jazz)...

Doug Fortune
http://www.cncKITS.com














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