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Profile Bearing Length Ratio, tp, ASME B46.1

Profile Bearing Length Ratio, tp, ASME B46.1

Profile Bearing Length Ratio, tp, ASME B46.1

(OP)
Howdy:

An engineer that no longer works at my company put a spec for Profile Bearing Length Ratio on a print at my company that I am not clear on.  Is this a bad spec or do I just lack the education to interpret it?

Here is the spec:

tp = 50% TO 70% AT DEPTH P = .25 Rtm, RELATIVE TO REFERANCE LINE C = 5% tp

The first part makes sense to me: tp = 50% TO 70% AT DEPTH P = .25 Rtm

But I am baffled by the second part: RELATIVE TO REFERANCE LINE C = 5% tp

Its almost as though he is saying that the slice line depth is relative to 5% tp.  How would you possible measure this?  Would you have to trail and error slice lines until you got 5%, and then subtract .25 Rtm?

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