controlling bored-out boss
controlling bored-out boss
(OP)
I have a part that whose outside shape is two stacked cylinders of different diameters.
(forgive the ASCII art)
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There is a bore in the larger cylinder. I want to control these three features so all are concentric. I realize that I want to use position or runout here. How do I determine which to use? What does one "buy" me vs. the other? The small cylinder bottom flat is datum A and its diameter is datum B.
Thanks,
Matt
(forgive the ASCII art)
-------------
| |
| |
-------------
| |
| |
------
There is a bore in the larger cylinder. I want to control these three features so all are concentric. I realize that I want to use position or runout here. How do I determine which to use? What does one "buy" me vs. the other? The small cylinder bottom flat is datum A and its diameter is datum B.
Thanks,
Matt





RE: controlling bored-out boss
I am sure others will have more detailed recommendations.
RE: controlling bored-out boss
If the product does not assemble in a mating hole, then I would agree with ewh and go circular runout. That will control the roundness and concentricity of the larger diameter to the smaller one but it does take a bit of skill to perform the check.
I agree that the bore should be positional at MMC to datum A and datum B at MMC. One could also use circular runout again but it is difficult to check.
Hope this helps.
Dave D.
www.qmsi.ca
RE: controlling bored-out boss
It depends on how the part mates to other parts. How do you want to position/control it.
Chris
SolidWorks 07 2.2/PDMWorks 07
AutoCAD 06
ctopher's home (updated 03-13-07)