I'd already responded before seeing Sep68's response. (if it "potentially" applies) I smell a scam. That's taking more than little liberty I'd say on their part.
That's why the supplier has the obligation to review all customer's documents (drawings, specs, whatever) before the order is accepted. We used to call this "contract review." Too many suppliers wait until problems occur, and then complain about unfairness, etc. Most questions should be asked before order acceptance, not afterwards.
Yea, DCX (Chrysler) already has that on their prints but we never had that capability. In my mind it would be nicer to just trace the part in on the CMM, overlay to the model and be done. Anyone with actual exper on that?
Yea, DCX (Chrysler) already has that on their prints but we never had that capability. In my mind it would be nicer to just trace the part in on the CMM, overlay to the model and be done. Anyone with actual expertise on that?
We do have the ability to check a profile will CMM. We even have the ability scan product with lasers. However doesn't tell you how to fix anything that falls outside the profile. Also you can run into problems relying on software if you did not start out with a valid set up. Most of our sub components were bid without fixtures.
Another reason to report BASIC values is to aid the shop in making corrections. If a machinist just sees the diametrical value he is clueless in how to make adjustments.
We do have the ability to check a profile will CMM. We even have the ability scan product with lasers. However doesn't tell you how to fix anything that falls outside the profile. Also you can run into problems relying on software if you did not start out with a valid set up. Most of our sub components were bid without fixtures.
Understood. Good points. Lessons learned should be taken in consideration when bidding the next job. And that does not always happen either. As a result, you're in the middle of it...no fun.
Another reason to report BASIC values is to aid the shop in making corrections. If a machinist just sees the diametrical value he is clueless in how to make adjustments.
Another reason to report BASIC values is to aid the shop in making corrections. If a machinist just sees the diametrical value he is clueless in how to make adjustments.
If you are reporting to someone who does not need the details, I agree that the diametrical zone is adequate.
If you are trying to diagnose a machining problem, a diametrical zone will not give enough information to fix the problem. Fixing a hole pattern where the holes are all shifted the same way is different than one where the holes are shifted multiple ways.
Noone knows which way the holes are scattered unless the BASIC details are provided.
If you are reporting to someone who does not need the details, I agree that the diametrical zone is adequate.
If you are trying to diagnose a machining problem, a diametrical zone will not give enough information to fix the problem. Fixing a hole pattern where the holes are all shifted the same way is different than one where the holes are shifted multiple ways.
Noone knows which way the holes are scattered unless the BASIC details are provided.
You are correct here but I hope that people in Quality do NOT tell manufacturing how to fix a problem (sometime it happens) since it will surely bite them later. I have seen in the past where someone in Quality would say "got to move it .040" left on the X axis and .035 up on the Y".
I would suggest that if more detail is needed on out of position holes, one could always report the actual location of the hole in X & Y co-ordinates, corresponding to basic dimensions, placing a bracket around the result showing that it is a reference value. It is the responsibility of Manufacturing to figure out how to move the tooling and not Quality. Do NOT place a tolerance on a basic dimension otherwise everyone will know that you have no clue in GD&T.
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