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Dia to be calmped or not

Dia to be calmped or not

Dia to be calmped or not

(OP)
hey i need to understand from this drawing if i have to design any gage to measure the hole, do i need to clamp the daimeter where  datum B is given

RE: Dia to be calmped or not

rupeshpahwa,

   All your references to datum_B that I can see are at maximum material condition.  A clearance hole just big enough to clear your hub at MMC would be an appropriate fixture.  

   The same goes for the datum_C hole.  

               JHG

RE: Dia to be calmped or not

(OP)
Hi drawoh thanks for your quick reply, can you please elaborate in terms in tolernace.

thanks a million

rupesh

RE: Dia to be calmped or not

Actually, the clearance hole in the gage would have to be the biggest dia of B plus .005 to accomodate the geo tol on datum feature B   :)

.293 if my eyes are seeing the numbers right.

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

RE: Dia to be calmped or not

rupeshpahwa,

   You should look into training in GD&T.  Your drawing looks like it was preparted to ANSI Y14.5M-1982.  The datums are not called up that way on the 1994 and 2009 standards, which now are maintained by ASME.

   You need some copies of the ANSI/ASME standards.

   The (M)s in the datum boxes of your feature control frames indicate that the tolerances apply when the datum feature is at Maximum Material Condition (MMC).  If the feature is not at MMC, you get a little extra slop.  

   If MMC had not been specified, you would have had to carefully design a centreing clamp.

               JHG

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