I need help with gaging IDs on plastic parts. We have an issue with an ID approx 15mm long (a bushing) having a wall thickness of approx. 0.75mm. I am told by one our engineers that a gage ppin should "free fall" thru the ID. Is this a recommended method. We know the bushing are slightly out of round and the functional diameter is normally larger than this. I have been asked to write an inspection procedure for this and I had thought I'd seen an old military spec that required the use of a 2 pound force required to measure an ID such as this.
Any ideas on this?
Duane Wade
Metrologist
TeleFlex Automotive - Pedals Division
301 W Ohio St.
Kendallville, In 46755
219-349-1985
dwade@teleflex.com
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Comments
mehryarsalim 6/18/2004
I have done done some research work for prediction of failure rates. I know most of the softwares out there only manage failure data and don't give you a way of predicting when a failure will occur. Your failure rate for equipment will be driven by the failure rate for your equipment components. You need to have historical data for the failure of the components to find the distribution for the failures and then based on data for the components find reliability of the system(equipment). You can find the optimal equipment replacement intervals to minimize "cost" or "downtime" which in most instances will be the same. When I did my research there was no software available to do that. If you need more information, please feel free to contact me at mehryarsalim@yahoo.com