Measuring the angle of a cone.

[David Courtney]

I have a cone, I need to measure its angle, the breakout diameter to Z0, and its breakout depth to a hole at the bottom of the cone.

How should I accomplish this?

Thanx

[John Kingston]

First create your alignment.
Measure the cone.
Dimension the Cone. "A" is the included angle. Using variable and various methods of dimensioning you can report the angle of one side. There are a number of threads detailing that.
Construct a circle from the cone, at a Z=0 location. Dimension the circle, "D" will be the diameter you need.
Measure the hole as a cylinder. Construct a circle at the intersection of the cone and circle. Dimension "Z" for that circle.

Hope that helps, I'm at home and can't post an example.

Here is one example I posted in another thread.

Scroll to the bottom of this page and you will see other threads discussing cones.

[#2#]

Also, FYI, if you don't have enough clearance at the bottom or top of a cone to measure a cylinder to intersect it with...

Measure the cone (con1 in code below), measure a circle (cir2 in code below) in the bore that it intersects. Go to construct a circle. Down near the bottom select cone. A couple of drop down boxes appear. Select diameter in the top one. Enter a number in the middle one and click ok. A circle will be created where the cone's diameter is equal to the number you entered (cir3 in code below) Now, in the edit window place your cursor somewhere in the theo line. Tab to the diameter and enter cir2.d. Now, a circle will be created where your cone's diameter is equal to your circle's diameter (the intersection point).

Change this...

CIR3       =FEAT/CIRCLE,RECT,OUT
            THEO/0,0,-0.0734,0,0,1,1.564
            ACTL/0.0004,0,-0.1194,0.0008703,0.0013088,0.9999988,0.3819
            CONSTR/CIRCLE,CONE,CON1,DIAMETER

To this...

CIR3       =FEAT/CIRCLE,RECT,OUT
            THEO/0,0,-0.0734,0,0,1,cir2.d
            ACTL/0.0004,0,-0.1194,0.0008703,0.0013088,0.9999988,0.3819
            CONSTR/CIRCLE,CONE,CON1,DIAMETER

And viola, you have your circle at the intersection without measuring a cylinder.

[John Kingston]

That is cool Goodluck. I never thought of that. Unavailable rep points to you!

[cmmguy]

Goodruck,
Good pointer! Have you ever been able to intersect the cylinder of a through hole with a cone to find the depth of the chamfer cone?? I havent and I use your method for that.

[jmendes]

I need to measure the angle of a chamfer along large circumference ring. I heard you can use a cone function for this but don't know how to apply it. Can anyone help?

[Douglas]

if you mean the 110° included cone angle it is the A in the dimension box for cones

[Douglas]

also replying to 12 year old threads is probably not the best way to begin... but I guess today it got ya there

[Douglas]

Cones can easily report either included angle or half angle, included angle is A, click the half angle box for half angle to be reported Capture3.JPG

[JEFMAN]

From the core manual, auto features, if it's what you're looking for...

Diameter box :
This box is only available for these auto features: Circle, Cylinder, Sphere, Cone, Polygon
The Diameter box defines the diameter of the feature. In the case of a stud, the diameter box displays the nominal, user supplied value.
For a cone, this value represents the nominal diameter at the end of the cone where you've defined the X,Y, and Z location.

Cone
The Length box displays the length of the cone.
A positive Length value indicates that the centroid is toward the cone's tip (the end of the cone feature that has the smaller diameter).
A negative Length value indicates that the centroid is toward the cone's base (the end of the cone feature that has the larger diameter).


• The vector of the cone points away from its apex.


Hope this helps...