Hi Folks Figure 6-49 of the Y14.5
Hi Folks Figure 6-49 of the Y14.5
(OP)
Hi Folks
Figure 6-49 of the Y14.5 standard, How does one establish the two datums C-D and measures the C-D for runout?
Figure 6-49 of the Y14.5 standard, How does one establish the two datums C-D and measures the C-D for runout?





RE: Hi Folks Figure 6-49 of the Y14.5
One would place datum D in a divider head or chuck but not too far in. The other end would end up wobbling.
Now place a digital indicator on a stand at the top of datum C and zero off. Rotate the part 180 degrees and take a reading. Tap the part carefully about 1/2 the reading difference and then tighten the chuck.
One would keep doing this until datum C is running true to datum D. Once you have done that, one may take the lateral circular runout on the faces shown.
The centre line was created through both datum D and also datum C.
Dave D.
www.qmsi.ca
RE: Hi Folks Figure 6-49 of the Y14.5
RE: Hi Folks Figure 6-49 of the Y14.5
RE: Hi Folks Figure 6-49 of the Y14.5
All product measurement is performed in free state but one would have to set up on the datums and shown.
Dave D.
www.qmsi.ca
RE: Hi Folks Figure 6-49 of the Y14.5
All inspections are “half baked” estimations of the true condition! With Dave’s method you cannot access the portion of the journal that is in the chuck, the jaws of the chuck itself are assumed to be running true to the bearing journals of the chuck (there is error), and only a limited number of the infinite number of the possible cross section traces will be performed.
Paul