Extended modules > 3D Documenation > Create 3D dimension labels > Dimension an unbounded slot
  
Dimension an unbounded slot
A slot dimension provides size control between features on the model. It specifies the degree of allowance in variations of geometric form and size. This control applies solely to individual features of size. It is infinite in length, and thus termed an "unbounded slot." To control the length of the slot, create a "bounded slot" following creation of the unbounded slot.
To define a slot dimension, you must specify two faces or a feature to control. These must be opposing faces or features, but do not have to be parallel to each other. You can also change the catch focus on the control faces.
An example of a slot dimension is as follows:
To create slot dimensioning,
1. Click 3D Documentation and then, in the Annotate group, click the arrow next to More.
2. Click Slot under Dimension. The Create GDT Slot Dim dialog box opens.
3. Select the feature to control:
Select the functional feature from the browser.
Click two faces on the model. (Shift-left-click the two faces, then Shift-middle-click to complete the selection.)
4. If necessary, click Catch 1 and Catch 2 to change the catch vertex on the references. The features are highlighted on the part as you change vertices. The selected references are highlighted, the extension lines of the dimension label snap to the selected vertices, and the dimension label becomes attached to the cursor. Note that the dimension value is displayed in the Dim Value box, which updates dynamically as you alter the current dimension.
5. Specify the placement of the dimension:
To create a free dimension, select Free under Placement, and click a position for the dimension label. The plane of the dimension is determined by its reference points.
To place the dimension on a docuplane, click Docuplane and specify the docuplane to use (double-click it in the browser, or click it in the viewport). The active docuplane, if present, is selected by default.
After placing the dimension label, you can click it or any other label to move it and click another position. This is allows you to organize labels "on the fly".
6. If necessary, you can add tolerancing information to the dimension.
7. You can include a prefix, postfix, subfix, or superfix with the dimension value by expanding the Text fixes area and entering text into the appropriate data entry fields.
8. You can use predefined tolerances and/or text fixes in two ways:
Presets: Click this to open a table containing values that were stored earlier.
Grab: Click this and then click an existing dimension in the viewport. The tolerance and text fixes of the selected dimension are copied into the menu and used for the current dimension.
9. If you are creating a GD&T dimension, you must also specify a Name for it. Optionally, you can also include a Descr, dimension critical Identifiers, or Insp. Notes. These will be shown in feature reports.
10. You can add a URL to a dimension text, which can be any file on your local computer, network, or the public Internet. The file will open in its default viewer when you right-click the dimension, then click Display URL.
11. You can end the current dimension in one of two ways:
Click Next to complete the current dimension and continue creating new dimensions with the same tolerance and text fixes.
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You can avoid clicking Next; once the current dimension is complete, simply click new references on the model to define a new dimension. The system will automatically make this the current dimension using the current settings.
Click Reset to cancel the current dimension but keep the menu open with the same tolerance and text fixes.
12. When you are finished creating dimensions, click to complete the operation.
When you click the feature to control, the Elements box becomes defined; you can change the feature at any time by clicking Elements and clicking new reference geometry.