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Partial circle, straight edges?

e5frog

So another high frequency application was this geometric figure I couldn't

make in Eagle.

 

It was supposed to be a 60 degree slice of a circle 15mm radius and 10mm

thick.

So 20mm in diameter empty space in the middle of a 40mm filled circle then

a 60 degree slice of that...  Like if you'd cut a slice of a donut.

 

I gave up after about 30 minutes and the best I managed to do was that

figure but ending with round edges. So I asked the guy at the Genesis CAD

software and he fixed it by masking a negative image upon that cirle just

by putting two straight lines from the middle 60 degrees apart and then

just kept the area between these - took two minutes.

 

So if I wanted to do that in Eagle, could it be done? Are there any known

plans of introducing negative images on the top and bottom layer?

 

I guess this is one of the reasons I used Paint or other paint software to

make PCBs images back in the day. You could do anything you wanted quick

and easy.   image

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  • Fredric wrote:

    >............. It was supposed to be a 60 degree slice of a circle 15mm

    radius and

    10mm thick.

    So 20mm in diameter empty space in the middle of a 40mm filled circle

    then a 60 degree slice of that...  Like if you'd cut a slice of a

    donut.

     

    So if I wanted to do that in Eagle, could it be done? Are there any

    known plans of introducing negative images on the top and bottom

    layer?

     

    Hi Fredric

     

    Gary gave a good answer.

    Just so you understand how easy it can be when you know how, try the

    following.

    The following will draw your required 60 degree arc from 1 o'clock, counter

    clockwise to 11 o'clock on the currently selected layer

     

    In the command line type (copy it there) this series of commands

    GRID mm; MARK (30 20); ARC 'mysignal' ccw flat 10 (P 15 60)(P15 240)(P15

    120); GRID last; MARK;

    Hit enter and observe the arc.

     

    The 5 commands are easier to spot when written this way. You could put them

    in one by one into the command line

    GRID mm; (Sets the grid to millimeters)

    MARK (30 20); (Sets the MARK at  your nominated centre of the arc and allows

    you to define the arc relative to this point)

    ARC 'mysignal' ccw flat 10 (P 15 60)(P15 240)(P15 120); (See below)

    GRID last; (Restore the Gris to what it was before)

    MARK; (Remove the MARK)

     

    The ARC command breaks down this way.

    'mysignal' (The signal name you give arc(wire) you are drawing.)

    ccw (The arc will be drawn counter clockwise )

    flat (The ends of the arc will be flat as opposed to rounded)

    10 (The width of the arc wire) in the current grid unit (mm )

     

    Then the arc itself is defined. Read the HELP /ARC to understand the three

    points.

    (P 15 60)(P15 240)(P15 120);

     

    Note Polar notation is used for defining the points. Read about this and

    Relative notation as well in the HELP and Manual.

     

    All the best

     

    Warren

     

     

     

     

  • in reply to Former Member

    Yes, that gives the needed flat edges but I get an error message "Invalid

    point: (P15 120);GRID l..."

    So I have to manually use it to draw the right length.

     

    Is there any way of getting these flat edges in any of the menu options?

     

    It's likely I will never encounter this again but I was curious if it could

    be done and it turns out it's just as easy if you know how...

     

    Book? Is there a book?

     

     

    Thanks Warren.

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    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

  • in reply to e5frog

    Just missing a space after the P, problem solved.

     

    Thanks again.

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