True Position to slots on OD

[[Ba...]]

True Position of Slot Wall on OD


Hi all, newer to programing and having trouble with this callout for true position (see mark up). The slot walls are measured as plane feature, A is face plane, B is ID, C (shown in attached) is a slot plane. Every time I attempt I receive an error, sure I am missing a step? All other TP used in this program are working fine but are not a plane.
I changed the plane feature representation to angle/not position, with nominal entered.

I have attempted as True Position with unreasonable result as I am using model, Bestfit Bore pattern, alway with Error.

[[Me...]]

Don't use a bore pattern. Check each slot individually to an alignment that is rotated to the basic angle for each slot and use linear position.

As an aside, the callout shown for position is only to one side of the slot, not the centerline or width of the slot. If you want the slot centerline then create a symmetry plane from each wall and use that for the position.

Robert

[[Ba...]]

Thanks for attempting to guide me!
I am afraid I don't understand the required steps to this part of the answer.
I created the features as individual planes.
I am not clear how to "check it" to an alignment that is rotated to the basic angle for each slot and use linear position.
Here is a pic. of plane with 39.45° Basic showing as A1 Z/Y.
What is my nest step on this? If I try to do TP with the feature as it is I get this when selecting the Feature

[[Me...]]

Click on the Special button in the True Position characteristic. Rotate by angle and enter the Basic angle dimension to align one of the axis (X or Y) parallel to the plane/slot. Then choose X or Y only depending on the direction in the shape of zone area.

Also, in your picture you don't have a feature selected, which may be why you're getting that error.

[[Ba...]]

Success!!!
The error occurred because I had changed the feature representation to Angle...once set back to Cart. , no more error and those steps worked great.
THANK YOU!!! 😃

[[Ia...]]

What does it mean "shape of zone Y only". I don't have the option to change this.
So do I have to set my rotation angle according to the shap of zone?

[[Me...]]

True Position is either a spherical, cylindrical, planar, or boundary tolerance zone, which is the shape of zone. Measuring an open ended slot, as the OP was doing, only checks the position in 1 direction, as the ends of the slot are open and have no location. You may or may not get the X/Y only option depending on the features chosen.

Robert

[[Ia...]]

So if I'm measuring the true position of a slot, or tab, and the shape of zone is Y only, should I adjust the angle offset so that the symmetery plane I'm measuring is always in Y position?

[[Ri...]]

You can go into Special inside of the True Position and rotate the alignment to the nominal angle of the slot. Depending on which way you rotate, either X or Y will be the shape of the zone. The main point is that you are trying to make it where you are only measuring the True Position in one axis.