Counterbore callout help
Counterbore callout help
(OP)
So I need to callout some counterbore holes on the drawing. However, the drilled surface is not perpendicular to the holes. Therefore, the depth of the counterbore is different for the 2 holes. Even for individual hole, the counterbore thickness varies due to sloped surface. How do I call out these holes so that they will have a 9mm "uncounterbore".
Thanks in advance
Thanks in advance





RE: Counterbore callout help
Your section view works for me.
The standard callout with depth, implies that there is an obvious flat, orthogonal surface to work down from, and clearly, there isn't.
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JHG
RE: Counterbore callout help
RE: Counterbore callout help
Plus, you're requiring the machinists to measure "back from" the other side of their part: Can you make a jig or fixture so the stop depth is automatic? It will be more error-proof.
RE: Counterbore callout help
The depth stop on the milling machine's spindle is set so the cutter face is the specified dimension from the machine table to which the part is clamped.
Mike Halloran
Pembroke Pines, FL, USA