Measuring Method - Inside diameter is off set from the outside diameter

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J

Jim Howe

#12
Wes Bucey said:
Interesting addition. What's the function? Can you get a mating part to check for form, fit, function? What function does the offset play?

With an optical comparator, it would seem simple, but expensive, to create a special reticle to fit over the lens or the screen, duplicating the engineering drawing for comparison of the offset to the piece part. Do you have an optical comparator or a neighbor with one you can use?

What equipment are you turning this part on? What's the material?

I'm curious as to how you set up to assure the 0.250 hole is through the thinnest wall.

What is your current production setup?
Do you turn a bar to OD, cutoff one-inch pieces, reclamp and bore the offset, then drill the 1/4 inch hole while still clamped?

There are some CNC machines that will drop this piece complete from a solid bar without further setup (including the cross hole.)

offtopic-d2.gif Designers and engineers never consider how much time and effort go into making a setup for production and inspection on a part that takes only minutes to produce once the machine starts.
Wes, I believe the function has someting to do with a spiral spring but have not as yet been briefed by engineering. It is currently in the hands of R&D. Material is GR50 steel but may go to AR400 (significantly harder). R&D turned the part using a lathe and came to me looking for suggestions as to 1) determine if offset is correct, and 2) locate where hole should be drilled. Not being that gifted in these matters I posted the question.
The first piece they brought was made as you outlined and the clamping pressure for the inside diameter was excessive and warped the ID (egg shaped). I was happy to scrap it and buy some time for the post.
:topic: I long ago learned that you have to play all the angles, for example if the wife wants the house painted suggest aluminum or vinyl siding as a much more attractive alternative!
Back to the problem. when the second part is completed I believe I will try Claes suggestion! It should at least give me a better idea where the thin wall is and that will be a step forward. I can then give to R&D to try. This usually gives me an oppourtunity to view the function.
Many times R&D comes with these request but usually they never see production. :thanx:
 
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