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Gage Ball in Cone

mdobb829
I have a Pallet that has (4) cones. There is a dimension from the bottom of the Pallet over an Ø85.000 MM gage ball. Is there a way to create the gage ball tangent to the cone? Cone.pdf
  • I'm not sure you can construct the sphere directly but with some basic math (or a CAD system) you can figure out the diameter of the sphere at the theoretical tangency point and then construct that circle (I forget what the option is called but there is a specific tool for constructing a fixed diameter circle in a cone). Once you have that you can offset along the cone axis by the nominal distance between that diameter and the 85mm dia to get a point at the center of the theoretical sphere.
  • Use circle construction. Under type of construction, select cone. Then for type of cone construction, select sphere. It will construct a circle at the tangency height. Then just create a point offset half the diameter from the circle.
  • Didn't know you could find a sphere tangency circle like that. Not sure what you mean by "construct a point offset half the diameter from the circle." The center of the sphere will not necessarily be at any easily predictable distance from the tangency circle center. You'll need to do some calculation to figure out where it is.
  • What you can try is create autopoints on two opposite sides of the c-sink construct 2x 3D lines & construct a circle tangent to these two lines. I saw over the pin dimensions done this way. It should work with spheres too.
  • That's an interesting idea, but wouldn't you want 2D lines? You are suggesting that he recreate the 2D view exactly as it appears on the drawing.
  • That's an interesting idea, but wouldn't you want 2D lines? You are suggesting that he recreate the 2D view exactly as it appears on the drawing.

    I think so. The way it looks it is over the pin dimension. But anyway, I think it could work either way. You might want to try construct 2D line from autopoints using best fit & then check graphics display window if this line goes thru all of those autopoints. If that don't work try 3D line & best fit. I usually try different options to see which one is fits best. And there is plenty of them in the software. Hope this helpsSlight smile.
  • Gage Ball Radius (GBR)
    Cone angle (CON1.A)
    Cone Half Angle (CON1.A)/2 

    ASSIGN/GBR = 44.25
ASSIGN/GB_Z = CON1.Z + GBR/SIN(DEG2RAD((CON1.A)/2))
ASSIGN/GB_TOP_Z = GB_Z + GBR
  • I would do like:
    Measure Cone at datum -A-, contruct inscribed circle with dia 85mm, construct pierce point circle/tangent line. measure distance point - surface
  • Didn't know you could find a sphere tangency circle like that. Not sure what you mean by "construct a point offset half the diameter from the circle." The center of the sphere will not necessarily be at any easily predictable distance from the tangency circle center. You'll need to do some calculation to figure out where it is.

    I just did a test and the sphere calculation is different than the diameter calculation

    CIR1 =FEAT/CIRCLE,CARTESIAN,IN,NO
    THEO/<8.9134,0.4921,-1.067>,<0,0,1>,0.483
    ACTL/<8.9134,0.4921,-1.067>,<0,0,1>,0.483
    CONSTR/CIRCLE,CONE,CON1,SPHERE,0.5

    CIR2 =FEAT/CIRCLE,CARTESIAN,IN,NO
    THEO/<8.9134,0.4921,-1.0352>,<0,0,1>,0.5
    ACTL/<8.9134,0.4921,-1.0352>,<0,0,1>,0.5
    CONSTR/CIRCLE,CONE,CON1,DIAMETER,0.5

    See the attached screenshot to see what I mean by sphere construction of a circle. It constructs a circle where a sphere of a given size would be tangent. That's why the diameter measures smaller than the sphere diameter. If you construct a point offset from the constructed circle by the radius value it will be where the top of the sphere is.
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