axis datum - bearing
axis datum - bearing
(OP)
Hi,
just a simple question I think,
fig 9.7 from ASME is more or less the only suitable example for this
generally it was hard for me to find any examples for runout with more than one datum (except fi 9.7) so I just to ask if this is correctly described:
I am measuring runout , but for meaurement process, the pin (yellow) goes thru a bearing, which may tilt a little bit which can deflect the measurement - and I want to reduce that effect
in application, surface B is connected to another surface so this effect is decreased
so in the fact - I shall also specify a datum B (which means that tool for measurement shall change its shape), which means that firstly - I am pushing pin thru bearing till it stops on surface N
am I right?
just a simple question I think,
fig 9.7 from ASME is more or less the only suitable example for this
generally it was hard for me to find any examples for runout with more than one datum (except fi 9.7) so I just to ask if this is correctly described:
I am measuring runout , but for meaurement process, the pin (yellow) goes thru a bearing, which may tilt a little bit which can deflect the measurement - and I want to reduce that effect
in application, surface B is connected to another surface so this effect is decreased
so in the fact - I shall also specify a datum B (which means that tool for measurement shall change its shape), which means that firstly - I am pushing pin thru bearing till it stops on surface N
am I right?





RE: axis datum - bearing
http://medias.ina.com/medias/infoimg/bilder/imager...
RE: axis datum - bearing
RE: axis datum - bearing
The bearings will be very closely built per their spec so there is no need to bury that contribution in a case where angular misalignment capacity of the bearing can exceed (which it should) the requirements of the installation.
Plus it means finding out early in the process, possibly while still on the mill.
RE: axis datum - bearing
we are already proceeding with solution which is similar to 3DDave proposal
thanks
RE: axis datum - bearing
John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
RE: axis datum - bearing
RE: axis datum - bearing
GD&T is not my first language by a long shot.
The image I linked was INA/FAG.
I believe the A and B are separate datums for the diameters, which have their own tolerances that I guess they want to exist separately and not be mucked up by the coaxiality/total runout, perpendicularity etc.
SKF is similar but different.
http://www.skf.com/pages/jsp/catalogue-table.jsp?i...