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NX6 drafting a compound angle 1
- Thread starter Toolinsp
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1
- #2
Ok, so you need two auxiliary projected views. You need to decide how the surface is going to be manufactured so that you can set things up in a way that will be useful to the toolmakers and won't require them to do any additional math to get the angles they need for calculating their gage block stacks. This is the hard part: getting exactly clear in your head how the sine plates are going to be stacked, which angle goes on the bottom, etc. Once that is clear to you you are ready to place views.
Lets say your part requires one rotation in the XY plane and then another in the YZ plane in order to level the surface in question:
1) Place a top view of the part (looking down on the XY plane).
2) Create a projected view from this view. In the projected view dialog there will be a section for projection direction and it will have defaulted to "inferred". Change this to "Defined". You will now see a standard vector definition box appear.
3) Define the vector for your projection. You can use any of the standard tools for doing this. You can click on an edge, a face, select two points, etc. You need to define a vector that is perpendicular to the angle of you first rotation (the view created will project off perpendicular to whatever vector you define). If the vector angle is correct but is pointing in the wrong direction (1st angle projection when you want 3rd angle or vice versa) click the check box in the dialog to reverse the direction. You should always have an edge of the compound angled surface visible in your top view that can be used to define this projection direction. Occasionally I have added a sketch in the view to give myself a perpendicular line if the only visible edges I have are parallel to the intended projection direction. Once the view is projected the sketch can be hidden.
4) Place your view approximately where you want it. Once the view is placed you can drag it back and forth a bit until it snaps to the projected direction (you'll see a symbol similar to a section line arrow showing the projected direction when the snap occurs).
5) Place a center mark connecting the center of the toolingball in your top view to the center of the toolingball in your projected view. Make sure the "multiple center marks" check box is cleared so that you get a mark that connects the two points.
6) Now you can dimension from a surface that is perpendicular to your datum surface (the surface that will be in contact with the sine plate or sine bar) to the center mark line to show the angular rotation to that projected view. If you did this correctly the angle shown will be the angle that the toolmaker will need to calculate their gage block stack for that rotation.
7) Repeat this procedure for the second rotation but this time project a view off of the view you placed in step 4 (not off of your original top view).
8) Connect the tooling ball from the view from step 4 to the toolingball in the view from step 7 with a centermark.
9) Dimension the angle (from a datum surface) to this new centermark line and you'll have the rotation for your second angle.
10) This final view should show your surface in true shape ( a single, straight line). You can now create a perpendicular dimension from the line representing the surface to the toolingball centermark control point to define the location of the surface.
11) You will likely also want to place a profile of surface feature control frame on the angled surface. Generally speaking, your datums should correspond with the surface that would be in contact with the sine plate (primary), a surface perpendicular to that (secondary), and the toolingball (tertiary). There could be exceptions to this but the toolingball will never be your primary datum.
12) Make sure your auxiliary views always stay snapped to the projection direction. I don't know of any way to lock this. If there is one I would love to hear about it. If you accidentally move one of the views your angles will change because the centermark line will move along with the view. I always double check to make sure my views are properly snapped right before I plot the drawing.
Lets say your part requires one rotation in the XY plane and then another in the YZ plane in order to level the surface in question:
1) Place a top view of the part (looking down on the XY plane).
2) Create a projected view from this view. In the projected view dialog there will be a section for projection direction and it will have defaulted to "inferred". Change this to "Defined". You will now see a standard vector definition box appear.
3) Define the vector for your projection. You can use any of the standard tools for doing this. You can click on an edge, a face, select two points, etc. You need to define a vector that is perpendicular to the angle of you first rotation (the view created will project off perpendicular to whatever vector you define). If the vector angle is correct but is pointing in the wrong direction (1st angle projection when you want 3rd angle or vice versa) click the check box in the dialog to reverse the direction. You should always have an edge of the compound angled surface visible in your top view that can be used to define this projection direction. Occasionally I have added a sketch in the view to give myself a perpendicular line if the only visible edges I have are parallel to the intended projection direction. Once the view is projected the sketch can be hidden.
4) Place your view approximately where you want it. Once the view is placed you can drag it back and forth a bit until it snaps to the projected direction (you'll see a symbol similar to a section line arrow showing the projected direction when the snap occurs).
5) Place a center mark connecting the center of the toolingball in your top view to the center of the toolingball in your projected view. Make sure the "multiple center marks" check box is cleared so that you get a mark that connects the two points.
6) Now you can dimension from a surface that is perpendicular to your datum surface (the surface that will be in contact with the sine plate or sine bar) to the center mark line to show the angular rotation to that projected view. If you did this correctly the angle shown will be the angle that the toolmaker will need to calculate their gage block stack for that rotation.
7) Repeat this procedure for the second rotation but this time project a view off of the view you placed in step 4 (not off of your original top view).
8) Connect the tooling ball from the view from step 4 to the toolingball in the view from step 7 with a centermark.
9) Dimension the angle (from a datum surface) to this new centermark line and you'll have the rotation for your second angle.
10) This final view should show your surface in true shape ( a single, straight line). You can now create a perpendicular dimension from the line representing the surface to the toolingball centermark control point to define the location of the surface.
11) You will likely also want to place a profile of surface feature control frame on the angled surface. Generally speaking, your datums should correspond with the surface that would be in contact with the sine plate (primary), a surface perpendicular to that (secondary), and the toolingball (tertiary). There could be exceptions to this but the toolingball will never be your primary datum.
12) Make sure your auxiliary views always stay snapped to the projection direction. I don't know of any way to lock this. If there is one I would love to hear about it. If you accidentally move one of the views your angles will change because the centermark line will move along with the view. I always double check to make sure my views are properly snapped right before I plot the drawing.
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- #3
Thank you Dasalo. I read your earlier thread, and I was hoping that you would have responded. I have not had the chance to try what you have described yet, but I will give it a shot. Did you find this easier to do; rather than doing it through modeling?
Thanks again. Jim
Thanks again. Jim
Yes, what I posted in that earlier thread was a bit of an amateurish way to do this. I think this is a much better way. I'll try to post an example tomorrow if I get some time.
The only thing that troubles me about the method that I posted here is the lack of ability to lock the angle between the views. There probably is a way to do this using the view origin tools but I just haven't explored it fully yet. As long as you double check everything before you plot the drawing you shouldn't have any trouble. Just remember that if you make any changes to the model the views won't move themselves so the angles will change and won't be correct. All it takes is a little wiggle of the view to get it to snap back to the projection vector and everything will be correct again.
The only thing that troubles me about the method that I posted here is the lack of ability to lock the angle between the views. There probably is a way to do this using the view origin tools but I just haven't explored it fully yet. As long as you double check everything before you plot the drawing you shouldn't have any trouble. Just remember that if you make any changes to the model the views won't move themselves so the angles will change and won't be correct. All it takes is a little wiggle of the view to get it to snap back to the projection vector and everything will be correct again.
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