Dia to be calmped or not

[rupeshpahwa]

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

 

[drawoh]

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

 

[rupeshpahwa]

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

thanks a million

rupesh

 

[ctopher]

rupesh,
drawoh is correct.
You need ASME Y14.5.

Chris
SolidWorks 09 SP4.1
ctopher's home
SolidWorks Legion

 

[Belanger]

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

 

[drawoh]

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