Lesson54- Temporary Tracking Points

OTRACK uses running osnaps as alignment points for tracking when the OSNAP status bar button is On

you can also specify temporary tracking points manually and they do not have to reside on an object snap point.

 

you can type TT at the keyboard or pick the Temporary Tracking Point button to use temporary tracking points.

One way to use temporary tracking points is as an alternative to using the From tool.

for example, you could create a CIRCLE (hole) that is 0.5 units from the corner by using the From tool as shown below.

Command: CIRCLE↵
Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: FROM ↵
Base point: (invoke ENDPOINT osnap near P1)
<Offset>: @0.5,0.5↵
Specify radius of circle or [Diameter]: D ↵
Specify diameter of circle: 0.5 ↵
Command:

  • Using From is like first placing the CIRCLE at the corner and then using Move with the offset as the displacement.
  • You could use Temporary Tracking Points instead and that approach can even be used in non-orthogonal directions.
  • You could perform the same task using Temporary Tracking Points in the following way.
  • invoke Circle and then invoke TT when AutoCAD prompts for the CIRCLE center point.

Command: CIRCLE↵
Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: TT ↵

acquire the Endpoint shown below as an alignment point.

invoke a 0 degree tooltip angle then type 0.5 and press <enter> to use direct distance entry for the temporary tracking point.

invoke a 90 degree tooltip angle then type 0.5 and press <enter> to use direct distance entry for the CIRCLE center point.

practice using temporary tracking points

  1. Close the drawing from the previous exercise if it is open.
  2. Open the T109_3.dwg drawing in your personal folder.

You will use temporary tracking points in this exercise to position the hole CIRLCEs in each corner as shown here.

  1. Pick Draw + Circle + Center,Diameter.
  2. Pick the Temporary Tracking Point button in the Object Snap toolbar or on the flyout of the Standard toolbar. (you can also type TT if you prefer not to use a button).
  3. Move your crosshairs over the Endpoint marker shown below to acquire it as an alignment point.

You are using Object Snap Tracking to specify the Temporary Tracking Point.

and you will use direct distance entry as well.

  1. Move your crosshairs to the right so the tooltip angle is 0 and type 0.5 then press <enter> to use this as a temporary tracking point.

  1. Move your crosshairs upward to invoke a tracking angle of 90 then type 0.5 and press <enter> to use this point as the CIRCLE center. Enter 0.5 as the CIRCLE diameter to complete the Circle command.

You acquired a tracking alignment point that was not on an object snap point by using the TT (Temporary Tracking Point) utility

you could continue using TT to supply any number of intermediate tracking alignment points in the same command.

  1. Use a similar technique to create the remaining CIRCLEs in the other corners.

More practice?

  1. Drop down the Layer list in the Object Properties toolbar and left-click on the light bulb icon for the Construction Lines layer to turn this layer On. Then roll up the list. A construction XLINE on this layer has already been created to help generate the missing LINEs in the top view.

  1. Pick Draw + Line and enter TT to invoke the temporary tracking point utility. Then acquire a tracking alignment point at the Endpoint marker shown below.

  1. Move your crosshairs upward to invoke the Endpoint: Intersection tooltip and left-click to use this point as a temporary tracking point.

  1. Move your crosshairs to the left to invoke the Track Point: Intersection tooltip and left click to use this point as the start of the LINE.

  • Now you are ready to create a LINE object that will represent this feature edge in the top view.
  • You could have simply used Line to create two temporary LINE objects between the three points that you have picked so far 
but you would have to Erase the temporary LINE obejcts after you create the desired LINE object. 
the tracking approach saves time because you create only the desired objects (there is nothing to Erase at the end).
  1. Invoke the Polar: Intersection tooltip shown and left-click to use this as the second point of the LINE. Then press <enter> to terminate Line.

  1. Use a similar technique to complete the top view by adding the remaining 5 LINEs.

  1. Save your changes to the drawing and Close the file.

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