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Machine Control Tolerances

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Message 1 of 4
jmartt
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Machine Control Tolerances

jmartt
Collaborator
Collaborator

This might be The Last Question I'll have to ask about this project:

 

I have a model now of a two-lane road with radiuses (radii, I know) as small as 200'. Grades as steep as 7%, and supers as high as 6%.

 

I wonder what frequency to generate the corridor at to produce the surfaces?

 

Obviously, I'm going to have to increase the frequency as needed to make the corridor "look right" around the curves and such. And the driveways, being steeper and tighter, will have higher frequencies as needed to describe the geometry to a tighter tolerance.

 

But I wonder, in general, does machine control "like" a certain range of frequency? Can it be too tight? Or is more frequency always better? Does anyone have any insight drawing from real-world experience?

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Machine Control Tolerances

This might be The Last Question I'll have to ask about this project:

 

I have a model now of a two-lane road with radiuses (radii, I know) as small as 200'. Grades as steep as 7%, and supers as high as 6%.

 

I wonder what frequency to generate the corridor at to produce the surfaces?

 

Obviously, I'm going to have to increase the frequency as needed to make the corridor "look right" around the curves and such. And the driveways, being steeper and tighter, will have higher frequencies as needed to describe the geometry to a tighter tolerance.

 

But I wonder, in general, does machine control "like" a certain range of frequency? Can it be too tight? Or is more frequency always better? Does anyone have any insight drawing from real-world experience?

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Message 2 of 4
rl_jackson
in reply to: jmartt

rl_jackson
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Mentor
Personally don't have a lot of experience with machine control but from a survey prespective (old school way) I thin 25' would be more than enough.

Rick Jackson
Survey CAD Technician VI

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Personally don't have a lot of experience with machine control but from a survey prespective (old school way) I thin 25' would be more than enough.

Rick Jackson
Survey CAD Technician VI

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Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.

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Message 3 of 4
Mike.M.Carlson
in reply to: jmartt

Mike.M.Carlson
Advisor
Advisor
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Hi @jmartt-

In my experience with pneumatic-powered machine control systems (Trimble), the smoother the surface the better. For your curves, I would recommend no tighter than 5ft frequency. That should keep things nice and efficient in the field.

**Another tip, if you turn on a surface style with contour increments of 0.1ft, you should be able to see where jagged TIN faces are. If you can see them in Civil 3D, then rest assured, a pneuamatic machine control system will pick it up in the field.

I hope this helps.




Michael M. Carlson
Senior Civil Designer
CADD Manager
AutoCAD Civil 3D Professional
AutoCAD Professional

Hi @jmartt-

In my experience with pneumatic-powered machine control systems (Trimble), the smoother the surface the better. For your curves, I would recommend no tighter than 5ft frequency. That should keep things nice and efficient in the field.

**Another tip, if you turn on a surface style with contour increments of 0.1ft, you should be able to see where jagged TIN faces are. If you can see them in Civil 3D, then rest assured, a pneuamatic machine control system will pick it up in the field.

I hope this helps.




Michael M. Carlson
Senior Civil Designer
CADD Manager
AutoCAD Civil 3D Professional
AutoCAD Professional

Message 4 of 4
jmartt
in reply to: Mike.M.Carlson

jmartt
Collaborator
Collaborator
It certainly does, Mike. Thanks.

It certainly does, Mike. Thanks.

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