Mounting part on setup tooling

2011 MR1, Romer 7525

I have been programming offline, using only the part model "floating in space", and creating a local coordinate system on the part. I want to bring models of knee blocks, 1-2-3 blocks, and other setup equipment in so I can program around real-world setups, allowing me to simulate datums, etc. I am finding the instructions in the Help screen very vague.

Can anybody give me (or point me to) a step-by-step tutorial on resting a part on a knee block in my Graphics Display Window?

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Wes Cisco over 12 years ago

That's not what I suggested, Wes. Please re-read it, and give me an updated assessment

I did not think you were suggesting that Colin. I misread the following post to reach that bad conclusion.

Some of the parts we produce are long or thin and fairly flexible; they frequently need to be secured to a block or table to restrain them. This usually makes the primary datum inaccessible.

To achieve the same end, can I program using the actual model surface, then pick up the mating surface when the part is measured? What modifications have to be made in the alignment to do this?

However the information in my post with the definitions is still valid and to the point. My issue with your post was,
it's not uncommon, but is also less than desirable, for the plate is not the actual datum. From a micron's perspective, that datum doesn't lay flat against the surface plate -- there are high points of contact that it is resting, due to it's deviation from perfect form. So no matter how you spin it -- it's not the same surface as the datum.

I consider that to be misinformation, (reinforcing a common misconception about what a datum is vs. what a datum feature is.), as my post with the definitions attempted to illustrate.

I was aware this was in the portable section and I usually stay out of here because I don't work with portable. However I saw the post when checking for "new posts" on the forum and since it was GD&T and I thought I could help, I tried. I also stretched my funnybone a little in the process to amuse myself.

If you feel my definitions are incorrect or bad information please state so and why. On Monday I can and will cite ASME Y14.5 chapter and verse to support my contentions if necessary.
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Wes Cisco over 12 years ago

That's not what I suggested, Wes. Please re-read it, and give me an updated assessment

I did not think you were suggesting that Colin. I misread the following post to reach that bad conclusion.

Some of the parts we produce are long or thin and fairly flexible; they frequently need to be secured to a block or table to restrain them. This usually makes the primary datum inaccessible.

To achieve the same end, can I program using the actual model surface, then pick up the mating surface when the part is measured? What modifications have to be made in the alignment to do this?

However the information in my post with the definitions is still valid and to the point. My issue with your post was,
it's not uncommon, but is also less than desirable, for the plate is not the actual datum. From a micron's perspective, that datum doesn't lay flat against the surface plate -- there are high points of contact that it is resting, due to it's deviation from perfect form. So no matter how you spin it -- it's not the same surface as the datum.

I consider that to be misinformation, (reinforcing a common misconception about what a datum is vs. what a datum feature is.), as my post with the definitions attempted to illustrate.

I was aware this was in the portable section and I usually stay out of here because I don't work with portable. However I saw the post when checking for "new posts" on the forum and since it was GD&T and I thought I could help, I tried. I also stretched my funnybone a little in the process to amuse myself.

If you feel my definitions are incorrect or bad information please state so and why. On Monday I can and will cite ASME Y14.5 chapter and verse to support my contentions if necessary.
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