Thread gages
Thread gages
(OP)
I would like some feedback from fastener manufacturers on the following points concerning (external) thread gaging :
- Has anyone experienced different results (i.e. same thread being conform or not conform) when using a) standard ring gage, b) adjustable ring gage c) roller type snap gage (functional) d)segment type snap gage (functional) ?
- Any ideas on the reasons for the differences above (assuming all gages are satifactorily in calibration ?
- How do you deal with a customer who throws out your bolt because he didn't find it conform with a different (but legal) gaging method than the manufacturer ?
- Has anyone experienced different results (i.e. same thread being conform or not conform) when using a) standard ring gage, b) adjustable ring gage c) roller type snap gage (functional) d)segment type snap gage (functional) ?
- Any ideas on the reasons for the differences above (assuming all gages are satifactorily in calibration ?
- How do you deal with a customer who throws out your bolt because he didn't find it conform with a different (but legal) gaging method than the manufacturer ?





RE: Thread gages
All thread ring gages are adjustable and are set with a setting master.
Thread gages are a composite gage trying to cover several different features (PD and form) at the same time and even if the PD of the thread is correct the major diameter may still be in error.
Talk to your customer and find out what method of checking they are using and if their gages have been calibrated and check your parts with the same method if possible.
RE: Thread gages
At my last employer, thread rings were often problematic for accepting/rejecting parts, between ourselves and customers,and ourselves and vendors. In many cases we had to end up supplying rings to the customers and receiving rings from the vendors, such that we were all checking the same way.
Alan M. Etzkorn

Product Engineer
Nixon Tool Co.
www.nixontool.com
RE: Thread gages
same type gages that the particular
customer is using if the quatity of
parts can justify the cost.
RE: Thread gages
plating and chew it off.
In problem described above, all gages are new and certified as calibrated. The offset described between the two methods is always in the same direction which enables us to purposely roll threads for ring gage gaging or for functional type roller or segment gaging; The problem arises when several customers need this product. There does not appear to be a reference method.
RE: Thread gages
RE: Thread gages