Starting over , what would my alignment be for this

[[Je...]]

I have been having issues with this part... the points never get hit in the same spot and I think it’s my alignment ... what do I need to do for the alignment to have them hit in the same spot if where I take my points

3501AC77-4C26-4754-8BA2-33EE231DC8AA.jpeg

[[Cl...]]

What (features) are, and how are you using them for the alignment?

[[Cl...]]

A plane for Z and spatial. An OD, or ID for the XY origin, and some feature to clock it (planar)

What does the print call out?

[[Je...]]

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I was doing the plane on the top (3 points) and then the large circle at the bottom and then the smaller circle in the middle at the top.

Alignment was going Plane for spatial and z, 3d line made of the circles as my planar and the large circle as my x/y origin. However it was effecting my measurements and it never took the hits in the same spot. Not even on the same sides and would hit my fixture. Some one said in my previous post that it could be how im doing my alignment. I feel the 3d line I was using the wrong axis but Im not sure which axis to use, it defaulted to the X+axis

[[Je...]]

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So does it matter what feature I use to clock it? Could I use an ID?

[[Cl...]]

Well, if the drawing doesn't specifically call out datum's, I'd use the large flat flange surface at the bottom of the part for my
Z origin and spatial rotation. The vertical OD for my XY origin and one of the 6 radii inside that cylinder to clock the part.

[[Je...]]

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As in take a point on top of one of the Radii ?

[[Mi...]]

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Taking more than 3 points would probably help. I'd never do fewer than 4 for a plane. I'd also consider using the lower flange for spatial instead, but that may not matter.

I'm not sure I understand how you did the planar rotation, and I really can't see enough detail of the part to figure how I would do it. Is it all symmetrical aside from the features inside the cylinder?

[[Er...]]

It's seem the small center circle is on the same center as your large OD. This doesn't work to create a 3d-line if the share the same Center. Are you checking other features that require the part to be clocked? If not, i would just remove the 3d-line and check the part without it. If you do, you need another feature to help clock the part, maybe another circle on a different center line, a radius, etc. to establish the planar rotation.

[[Cl...]]

Probe a plane on the surface with the "30" on it.
Probe the OD cylinder and intersect and shell it on the plane.
Probe one of the six radii and project it onto the plane.

Your base alignment, the plane goes in Spatial (Z+) and Z origin.
Shelled cylinder will be X & Y origin. Projected radius in planar (Y+)

[[Je...]]

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There is a smaller circle down inside the part. Should I use that for something

[[Mi...]]

Is it concentric with the OD? If so, it's not very helpful. If it isn't concentric, then it could be used for the planar rotation.

[[Je...]]

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I appreciate your help....I am very new to this...SO can you explain how I Shell a cylinder intersect and shell it on a plane

[[Cl...]]

When you intersect a cylinder with a plane, you will see a check box to shell. That turns the intersected point to a circle.

[[Me...]]

If there are ne clocking features then you don't need a planar feature and can leave it blank. It will default to the machine axis, which should solve your problem of it not repeating.

If there are features that need to be oriented/clocked then post a picture looking down from the top into the tube. It looks like there are some scallops or something on the top. I can't tell what's going on inside of the tube.

I'll reiterate what I said before. You need to use a feature that is perpendicular to the spatial axis or a combination of features that create a perpendicular feature to your spatial to use as a planar rotation. It's all about the vector of the feature. The vector being the direction that the surface faces. For example, if you try and create a line on the top face, even though it has a direction it's pointing on the screen, the vectors are pointing straight up, which is the same as your spatial. You need a feature that points perpendicular to the top face.

You could use a circle in the center and a point on one of those scallops. Create a 3d line by recalling those 2 features and use that for clocking. Or you could use a hole in the center and another hole that's NOT concentric to the center to create a 3d line from.

Robert

[[Me...]]

If I were checking this part I would create a plane on top, circle for origin, and ? for clocking as a base alignment. Then I would measure the tall tube, create another alignment from that, and use that as my main spatial feature, along with the top and whatever is clocking it, if anything. The tall tube will reduce your possible projection error in your results, as it travels the entire length of the part.