Lathe center marks
Lathe center marks
(OP)
When specifying the center mark left on the ends of a lathe built part, should it be fully defined via GD&T, or can a simple note allowing a max diameter and max depth be specified?
Thanks in advance.
Thanks in advance.





RE: Lathe center marks
I would say that is a risk management assessment, when the designer will get away with max diameter and max depth or more robust product definition must be used. (profile for the conical surfaces, etc.). When is good enough?
The same as: how to define radii?
R with ± or with profile.
Where you draw the line? Up to the designer to decide; the complexity/criticality of the feature. Function again.
RE: Lathe center marks
If the lathe centre mark is not functional to me, but otherwise I don't care, I would specify a maximum geometry for it. Don't require the feature. Allow them to do the feature.
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JHG
RE: Lathe center marks
Certified Sr. GD&T Professional
RE: Lathe center marks
The position is by default, and is concentric with the part.
So specify the maximum depth only, and that should be it. The standard included angle will default the OD by the depth.
RE: Lathe center marks
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Lathe center marks
Considering this comment: you could put a MAX diameter and MAX depth to limit any concerns with structural or other design requirements.
Certified Sr. GD&T Professional
RE: Lathe center marks
RE: Lathe center marks