Cyl Issue....

[[Mi...]]

Per the SS here, why are my actuals not at 0.00 seeing how I put my align to the center of said Cyl. What am I missing with this set up? Am I doing something wrong lol. After all it is Monday..\

[[Cl...]]

I just measured a circle and used it in my BA (XY zero), and
yes the actuals are .00052 & .00020. If I change the evaluation
of the circle the actuals change slightly (.00055 & .00020)

I'm sure someone out there knows more than that. I'm guessing
it's got something to do with the evaluation used in the BA?

[[Mi...]]

Yeah BA might be the issues. Its just off SO far is my concern. Ill mess around with it..

[[De...]]

You said you align to the cylinder, but the alignment for the cylinder is Base Alignment.

I assume this means you are using the cylinder in the base alignment, but is it what you are using for your spatial rotation and position?

If your using it for Spatial rotation as well as the location of the axis of the cylinder then I would expect to only see the form error from the cylinder affecting the actual values for the cylinder location.

If however you are using anything else for the spatial rotation / positional location of the base alignment then the orientation of the cylinder in relation to the base alignment would likely explain the actual values you are seeing.

[[Da...]]

Try using two circles , then recall the 2 circles into a 3d line. Use the 3d line for spacial in the BA. X and Y too if that's ok.

You can recall feature points into a cylinder after that. Cylinder is pretty bad at alignments. Just my 2 cents.

[[Te...]]

Try looping the alignment and see if the turn to zero. If you are running from the "named" alignment it might be the offset from the last manual alignment.

[[Mi...]]

This part is a small tube as you can see in the cutaway. I only check diameters ID/OD and a concentricity call out from the top of the tube, down to the cyl that Im having the issue with. I have 0.1 @ M and the Conc is in with that bonus tol. But still want to find out why the Cyl is not 0.00.
I plane out on top of the tube lip, then X Y to the Cyl. That's really all the alignment I have on this part..


Ill try the loop.

The 2 circles/line did not make a difference

[[Me...]]

Mike,
Your last post about creating a plane on top of the cylinder helps a lot. If the top of the cylinder is Z=0, the cylinder A1 and A2 show it to be slightly 'skewed'. The XYZ icon for that cylinder is at the bottom of the part. The numbers you show are where the cylinder axis intersects your top plane. They will only be zero if your cylinder axis is perfectly perpendicular to your top plane.

[[Mi...]]

Ron... What you say makes sense. This is a stamped part. That cyl is actually stamped into the tube. The stamping process is part of the issue and why they give me 0.1 at M on the Con. All of the OD and IDs I take and reference back to A Cyl are all skewed.

Going to be a part issue. Final answer lol

[[Ri...]]

Your A1 and A2 are showing almost 15 minutes of angle. If constraining the Normal Vector is permissible, that might help.

[[Ma...]]

Use the 3d line method for the base alignment or the form of the cylinder will come into effect. I would measure more than 2 circles, at least 3 circles to create the 3d line.

You can go back and measure the cylinder as a single feature later.

Mark

[[Mi...]]

Im going to get back on this tomorrow and will throw your ideas in and see what I come up with on the Cyl

[[Mi...]]

Part is all jacked up. I make 3 circles and they all have no skew at all. 3D line looks perfect. I go in and recall the circle points into a Cyl and bam it skewed way out.

Calling the part bad. On to the next ,...........

Thanks!!!!!!!!!!

[[Da...]]

Did you filter and outlier the recalled cylinder? The filters on the individual circles don't carry over...

[[Mi...]]

Yupperz

[[Ma...]]

Mike,

Have you remeasured the cylinder, instead of recalling points, after making the 3d line your spatial?

Mark