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Drawing Interpretation


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I have a snippet of a view from a drawing done in 1986 and states no specific standard to follow, though ANSI Y14.5-1983 was the standard du jour.  There are 6 slots are on the OD of a cylinder which is datum C, but the view only shows 1 set of 3.  I didn't put any details regarding profile on slot sides because they're just more of the same, profiles without a DRF.

I'm pretty clear on the position of one end of the slot to C, except for MMC on a BASIC radius.  It calls for profile of each end of the R.134 6 places and by today's standards, we would normally think that's only controlling the size and form of the radii.  Any thoughts?  The customer is covertly depending on us to supply them with a cmm program that they don't have and I could probably come up with something close but I gotta try to make it right, or as close to checking it so it's right functionally.

Screenshot 2026-05-06 141613.jpg

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Part 2

I know I can create individual curves for the .003 unequal distribution profiles but is there a way to measure the entire periphery of a slot with 1 curve and mix the 2 profile types so I can use a plot?  And, because there is no DRF, I would like to measure all 4 regions with 1 curve, otherwise, the best fits on 4 separate curves is not going to paint a realistic picture due to no DRF.

Screenshot2026-05-07144225.thumb.jpg.eec6506f112a4adcbc8a7e3cba490048.jpg

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I'm trying to visualize what's going on so bear with me.

Top pic: If the slots are related to a cylinder, which way is the axis pointing relative to the slots? Since a cylinder axis doesn't have an end, what's controlling the slots location along the axis direction? Is there another datum feature? Since there's diametrical tolerance zone then it implies that it needs another datum or it would be a linear zone. On old drawings like this I've seen, it was common to have the true position controlling the centroid of the slot in both directions (center of length and width) and the profile controlling the form. As far as tolerances on basic, there me be another document that controls that. Companies like Boeing, General Dynamics, etc. would often have a separate tolerance document with tables for feature types, hole sizes, decimal places, etc. Not sure if any of that helps but who knows. 

As far as pic 2, you should be able to scan the entire slot as a closed curve and use segmented tolerances for each profile zone inside of the curve settings below the curve tolerances. You'll need to break it up by point numbers. You should also be able to recall all slots into 1 curve and use that for your representation of the set of slots as a whole, if needed.  

 

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