It's no fun searching for information on constructing an arc when the search function limits you to a minimum 4 characters (searching for '*arc*' seemed to work though). But I digress...

What I am trying to do is construct a best fit circle based only on

I actually need to compare the results of two best fit circles - one with the questionable area (an uneven section on the circle), and one without. So if I can avoid actually doing additional scanning and just utilize the scan of the entire circle it would help a lot.

I'm having a hard time understanding all of the possible settings under the 'Scan Segment" option for constructing a circle.

First, the 'Discard Start Maximum' and 'Discard End Maximum' boxes. From reading the help file it looks like I'm entering a range of points to skip. So if there are 160 points of scan data, I could skip, say, points 60 to 100? Also, if I want to disable the 'Discard Tolerance' option, should I leave it at 0, or enter some ridiculously high value that will not filter out anything?

The other questions I have are concerning 'Approximate Start Point' and 'Approximate End Point'. Does this control what direction/order the data is used to construct the circle in or can I assume that the order the data points are read is in the order/direction of the original scan? (Edit: I don't see how these two points could control the direction...direction could be either way.)

I have been able to play with the settings and gotten results that look promising in the report window, but I can't think of any way to verify that the data is being used in the way that I think it is.

I have entered Start and End points, but I'm not sure if the circle is being constructed in a clockwise or counter-clockwise direction, which could potentially result in skipping a lot more points than I would like.

Thanks in advance for any help,

PG

What I am trying to do is construct a best fit circle based only on

*part*of the data from a linear closed scan of a circle. I have a section that I need to skip.I actually need to compare the results of two best fit circles - one with the questionable area (an uneven section on the circle), and one without. So if I can avoid actually doing additional scanning and just utilize the scan of the entire circle it would help a lot.

I'm having a hard time understanding all of the possible settings under the 'Scan Segment" option for constructing a circle.

First, the 'Discard Start Maximum' and 'Discard End Maximum' boxes. From reading the help file it looks like I'm entering a range of points to skip. So if there are 160 points of scan data, I could skip, say, points 60 to 100? Also, if I want to disable the 'Discard Tolerance' option, should I leave it at 0, or enter some ridiculously high value that will not filter out anything?

The other questions I have are concerning 'Approximate Start Point' and 'Approximate End Point'. Does this control what direction/order the data is used to construct the circle in or can I assume that the order the data points are read is in the order/direction of the original scan? (Edit: I don't see how these two points could control the direction...direction could be either way.)

I have been able to play with the settings and gotten results that look promising in the report window, but I can't think of any way to verify that the data is being used in the way that I think it is.

I have entered Start and End points, but I'm not sure if the circle is being constructed in a clockwise or counter-clockwise direction, which could potentially result in skipping a lot more points than I would like.

Thanks in advance for any help,

PG

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