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continuous diameter as temporary datum feature?

continuous diameter as temporary datum feature?

continuous diameter as temporary datum feature?

(OP)
The wheel in attached drawing has two steps mfg processes. Water cutting by a supplier to cut the spoke then machining in our shop to make center hole and outer diameter. The scenario is similar to casting vs. machining. On the water cutting drawing I need a temporary datum features to establish datum axis. I select the root dia of the spokes. Can I treat that dia. as CF dia. and use it as a datum feature? Do the datum callouts in the two drawings make sense to you?

We work to Y14.5-2009.

RE: continuous diameter as temporary datum feature?

Yes, I believe <CF> (10 SURFACES) placed by the datum feature B symbol would work fine. As an alternative, you could use the OD as datum feature B instead, with a similar CF modifier, then reference B also (so [A,B]) for your 10 profiles from X to Y.

Best Regards,
Dean
www.d3w-engineering.com

RE: continuous diameter as temporary datum feature?

I agree with Dean that technically CF modifier could be associated with datum feature B on the water cut drawing (although physically the 10 dia.50 surfaces were not formed from a single feature).

The alternative - OD as datum feature B instead, with a similar CF modifier, then reference B also (so [A,B]) for your 10 profiles from X to Y - is a choice too.

I have another one: get rid of B completely and control everything (that is the spokes and the outer interrupted diameter) with relation to A only. Simultaneous requirements will do the rest.

RE: continuous diameter as temporary datum feature?

(OP)
Is using the OD 184 as temporary datum a good practice? Reading through para 4.3.1 of Y14.8, I tend to think the dia.50 is a better option for the temporary datum feature.

RE: continuous diameter as temporary datum feature?

Yes, I agree. The OD 184 isn't the best candidate for a temporary datum feature.

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