TP Callout

[Duckhunter]

I have a print that perplexes me. The TP callout is

|TP|dia .100 M|

The holes are dimensioned to B and C are they looking for a best fit? Or is this an Engineer that might not know what he is doing?

Tim

[kmcmm]

It is odd not to have any datums referenced in the FCF. Are the holes in a bolt hole pattern?

[BOB PARSONS]

TRUE POS.

I have never seen this. Can anyone find it in Y14.5

[Shelley Liebman]

I have seen it many times, either the engineer is implying that you take them back to the datums, or if it is a bolt hole circle, they may mean to do a best fit alignment. If it would be too much trouble to try to get an answer from the customer, you may need to think for them based on the type of part you are checking and the other callouts on the print.
what is it, and what does it do?

[John Kingston]

What is the date on the print? I have seen "assumed" datums and basics on old prints. Not sure if that was the standard a long time ago.

[rangerboat72]

Just a thought, but it's probably

Just a thought, but it's probably either single segment or composite tolerancing...

[Duckhunter]

date:

Print was made this year....6-22-06

[Duckhunter]

print

heres the print

[bw_bob]

Since there are no datums in the FCF i would say they have to be implied.

[rangerboat72]

Since there are no datums in the FCF i would say they have to be implied.

That would be my best guess. Hopefull you have some idea of what datums you are supposed to use for your main setup...

[twoodcox]

Looks to me like they are asking for concentricity between the drilled hole for the tap and the counterbore

[kbotta]

You mean coaxiality, right? Concentricity is another monster all in it's self.
As far as your FCF,
That is what I would think.
KB

[Duckhunter]

called customer

I called the customer this morning and left a message...got a call back a few minutes ago. They want the holes checked to the ABC datum structure that another hole was properly dimensioned to. He stated that they have alot of cleanup work on the print b4 production starts.

Tim

[Paul Barriage]

I agree with BW_Bob

No specified datum would = default alignment.

[Wes Cisco]

You mean coaxiality, right? Concentricity is another monster all in it's self.
As far as your FCF,
That is what I would think.
KB

Picky, picky, picky, I am sure the "engineer" meant what you know even if he didn't know it!