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Keep position


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Here's one example. Let's say you were measuring the blade faces of a 6 blade turbine fan. You create a Free Form Surface on the first blade. Next, you create a secondary alignment to rotate about Z by 60°. Next, you copy and paste the first FFS. Open the 2nd FFS. Tick the Keep Position checkbox, click on the secondary alignment. You'll see the strategy rotate by 60°. To get the coordinates back to the BA, you untick the Keep Position checkbox and select the BA. Next, you copy and past the 2nd FFS and repeat the process until you have your 6 blades. If you're using an RDS/CAA, you can just edit the A angle by 60° for each blade.

Alternatively, you could create 5 different secondary alignments and just copy the first blade 5 times and do the above "keep position" routine.

Yes, you could do a similar thing with a rotating pattern, but you'll likely lose control of which stylus you want to use.
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Keep Position is used to maintain the same coordinate values as you change to a different alignment.

For example, you have a circular part and have holes around the part. You can use rotational pattern around one datum and report the values, but they come from your base alignment, but your print calls for the holes checked to an angle, let's say. Create the need alignments around the given angle. Now measure the first feature to the 1st alignment. Now copy the feature and paste the feature. Open it up and choose Alignment2 you will see it changes the nominal values. Click Reset to change it back to the original alignment now check Keep Position then change to Alignment2 and it will maintain the nominals from the first feature.

I have a video I made and can send it to you if you want to PM your email.

Mark
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