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Validate my method is fine please (programmers differ in opinion)

Lord_Warfield
Good Morning Interweb,

So I have a simple alignment. Plane A, circle B, circle C. I Leveled to the plane A and origin Z to it. Translate XY to circle B. Rotate to a line made from B to C. Done.

A different programmer believes I must rotate before translating.... I totally disagree on this simple alignment. Using Legacy btw.

Without being degrading... please reply.
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  • hear me out. i know this is an exaggeration but consider this... dotted line is the actual part. I need to do more thinking about the entire method. I dont remember where i heard it originally but it vaguely made sense and i have kind of adopted the practice into my programming.

    again... not saying youre wrong or doing anything incorrectly. but hoping i can finally put this to bed for myself. basically my main concern is how much deviation are you removing/introducing by creating multiple alignments vs maintaining the same alignment to measure the features. would be interesting to test this with some gage blocks or something that you could manipulate the positioning of or the angle of the primary or secondary datum to see the deviation contributed if any at all.



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  • in reply to cheesiechanman
    Quantifying actual cosine error contribution is pretty complex and depends on your probe diameter as well as how far from "normal" your part sits on the machine's volume.
    --If your actual part is a few degrees off, & you're using a 2mm or smaller probe, the chances of having cosine error contribution over 0.001" are pretty low. But, if your angle is off by 15 degrees or more, and/or you're using a larger probe, you can bet your rear that cosine error contribution is more significant.
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  • in reply to cheesiechanman
    Quantifying actual cosine error contribution is pretty complex and depends on your probe diameter as well as how far from "normal" your part sits on the machine's volume.
    --If your actual part is a few degrees off, & you're using a 2mm or smaller probe, the chances of having cosine error contribution over 0.001" are pretty low. But, if your angle is off by 15 degrees or more, and/or you're using a larger probe, you can bet your rear that cosine error contribution is more significant.
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