Casa250
Mechanical
- Jul 21, 2021
- 3
Hello,
it seems a simple question but I fail to find any concrete answers on this online.
If a drawing show a dimension with rounded brackets it is referred to to be a "checking dimension".
When "100%" is added then this would mean that all parts are checked, so 100%, correct?
When "SPC" is added then this would mean that a large number of parts are manufactured, then measured and then the capability cpk derived from it to understand the process capability thus getting a confidence that the process is stable and not all parts need to be measured but only a few, say for each batch or at the beginning of each shift etc, correct?
So now, if there is only the rounded brackets but no SPC or no 100% the official information I find state that this means "needs to be measured". My question is, how often? Is there a standard / ISO that defines this or do we have to specifically clarify this with the supplier?
Thanks!
it seems a simple question but I fail to find any concrete answers on this online.
If a drawing show a dimension with rounded brackets it is referred to to be a "checking dimension".
When "100%" is added then this would mean that all parts are checked, so 100%, correct?
When "SPC" is added then this would mean that a large number of parts are manufactured, then measured and then the capability cpk derived from it to understand the process capability thus getting a confidence that the process is stable and not all parts need to be measured but only a few, say for each batch or at the beginning of each shift etc, correct?
So now, if there is only the rounded brackets but no SPC or no 100% the official information I find state that this means "needs to be measured". My question is, how often? Is there a standard / ISO that defines this or do we have to specifically clarify this with the supplier?
Thanks!