2d curve vs 2d line

[[Cl...]]

I have a very small surface (approx. .080) to create a secondary datum for planar rotation.
Originally I used (scanning) two parallel lines (measured on opposing planes), then create
a symmetry from them. No matter how many points I use, or what the point spacing/speed
is, the first few points show up red (I'm assuming they are not being counted as good points).

So, now I tried using 2d curves in place of the lines. I recall the curve points into the 2d lines.
With this method the first few points show good (no red), and I am able to make the lines longer
for a more stable alignment, and I can scan faster. Why are ALL the curve points from start to
finish being measured, but the lines points are not?

[[To...]]

Calypso automatically "masks" the first .25 seconds of scanned strategies on standard geometry. Curves don't mask points. It doesn't mean they're good or bad points. Slower scan speeds will result in a shorter length of red points. In the features settings editor, you can turn masking off but I generally don't. I trust that Zeiss masks the points for a reason.

How do you know the alignment is more stable? More points? What if the beginning points aren't reliable?

[[Ri...]]

I'm confused because Calypso shouldn't allow you to use a 2d-Line segment as a 2d Curve.

[[Cl...]]

Tom, I incorrectly assumed that those first few curve points were "good" because
of the visual difference between the curve and line.

Richard, I ignore the warning. I've seen the same strategy used in one of out
production programs (very reliable) that Zeiss wrote for us. It passed a Gage
R&R coming in under 20%

[[Is...]]

If you notice well during the measuring: The lines start the scanning with the speed you put in the strategy almost immediately, for that reason calypso enables by default to erase some points at the beginning of the scanning..

on the other hand with curves the scanning speed achieves the value that you put in the strategy gradually allowing to have more stable points at the begging of the scanning..

[[Si...]]

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I used this exact quote with a Supplier this week.. It blew their minds!

[[Am...]]

I believe the first points are masked because this is the acceleration of the probe before it reaches the speed, thats what the Zeiss techs have told me basically those points being the least reliable because of the force not being consistent.

[[Ri...]]

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Yes. This is why on circular scans you go more than 360°.

[[Am...]]

Yeah I have it set to default to 380°