Re: New to CNC how do I calculate these points from the dimensions on this drawing?

Randy Replogle wrote:

On Thu, 30 Mar 2006 07:49:08 GMT, shicks <stukndaweb1@xxxxxxxxxxxxx>
wrote:

I'm starting a machining course in the Fall, I wanted to get a basic
understanding of the various G and M codes that are used so I purchased
CNC Programming Handbook by Peter Smid. Using it and a free CNC
simulator I've taught myself what the different codes do, and can write
very simple programs. I can normally figure out the start and end point
of arcs along with the I and J parameters, but I'm stuck on one of the
practice problems.

I've figured points for the outside contour, I've checked that with the
simulation program. I can't figure out the points for the inside
pocket. I've tried using the formulas for the chord and tangent of a
circle, but I don't see enough information on the drawing to use either.
Could someone please look at the drawing and show me what I'm missing.

Are those drawings done with CAD? If so won't it tell you where the
tangent points are?

Randy Replogle
--
Randy Replogle




Offset the inside lines by the radius of the arc, and draw an arc with
the .065 added to the existing radius. This will give you a picture of
the point you are looking for.

You can compute the angle by using the difference of the two radi and
the distance between the two center points. Then you can calculate the
point of tangency.


John
.

Relevant Pages

  • Re: New to CNC how do I calculate these points from the dimensions on this drawing?
    ... understanding of the various G and M codes that are used so I purchased ... CNC Programming Handbook by Peter Smid. ... Could someone please look at the drawing and show me what I'm missing. ...
    (alt.machines.cnc)
  • Re: modifying array access syntax
    ... >> programming equivalent is far worse than paper and pencil notation. ... an argument which hardly holds for greek letters, ... > Note that mathematician start with a long list of definition: ... Same reason it makes sense in the codes I write. ...
    (comp.lang.lisp)
  • Re: A petition to J3 apropos FORTRANs future
    ... >> web programming, GUI development, and text analysis. ... >> may partially explain the small market share of Fortran. ... almost NO new code would be written in the language. ... time on the types of codes that scientists and engineers want and need to ...
    (comp.lang.fortran)
  • Re: Fortran vs C++ for scientific computing
    ... of our codes are far too complex. ... of F95 vs. C++ for scientific computing? ... The analogy I use for this sort of thing is one of regular old spoken languages: ... This issue comes up again and again in comparing programming ...
    (comp.lang.fortran)
  • Re: Trying to Learn VB
    ... >trying to learn how to compile VB codes. ... >(By Val SaveAsUI As Boolean, ... programming, and this really isn't the place to start from scratch. ... auric underscore underscore at hotmail dot com ...
    (microsoft.public.excel.programming)