Confuse about various points method

[[Th...]]

What is the different between the various points method i.e touch point, space point , plane point...?

[[Da...]]

The difference is all about how the difference between the ball center and compensated point is calculated.

The below is from the help file, under "basics of the point feature"

[[Ah...]]

Could you please explain to me what is the difference between space point and plane point ?

[[SH...]]

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Calypso___Space_point_modes.pdf

[[To...]]

Below is something regarding the big 3, as far as I'm concerned. This may not be totally accurate but I think it's close.

Touch points, which is the default evaluation when creating single point features on a model or part. Touch points will always snap to the closest primary axis, which could be from the base alignment, or a secondary alignment when using the Pre-Assignment function. Touch points are usually good to establish a depth or location of a plane that is normal to the X, Y or Z direction of the alignment used. The I, J or K value will typically be 1 or -1 which indicates the direction of the point vector. This value is the cosine value of the point vector cos 0° = 1 and cos 90° = 0 So, a point on the left side of a part, will have a -1.000 in the I field and a 0.000 in the J and K field.

Space points, which are the easiest to create from a model. Wherever you click on the model, it will read the surface vector and apply it to the I, J or K value. It is typically used to report how high or low the surface is from it's nominal. Often used as a quick profile check where the .010 profile tolerance is cut in half and converted into a ±.005 tolerance.

Plane points are similar to Space points in that they use the surface vector. The easiest way to create one it to create a Space point from the model, then change the evaluation to plane point. I've attached a Point presentation by Ryan Stauffer where he says "Assuming plane measurement always" under the description of a Plane Point. Not sure exactly what he means.

Point.ppt

[[Ch...]]

Thanks everyone for the helpful info. Definitely easy to get confused.

Tom,

I think the point.ppt means plane point always assumes it is on a (nominally flat) 'plane' feature.

[[Ah...]]

Thank you!