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Can someone suggest pros & cons for fixed v/s protable CMM.

I have following questions on measurement of pitch diameter for ASME B1.1 UNC threads. 1)Is there a standard which gives guidelines on how to determine pitch diameter of threads by 3- wire method. 2)What is the fastest method on measuring pitch diameter for fasteners. (I am referring...

Thank you everybody, some of the responses were very good.

The threads are varying from sizes 1/2" to 2". There were not any problems of pressure surges or freezing. We are trying to check out if the correct sealnt was used. The threads gauge correctly & profile is also OK. What beats me is what is the reason for leak to start over a period of...

I have to conduct failure analysis on some screwed fittings used in fire fighting industry. These are used to connect pipes & sprinkler heads. We have a situation where some of the fittings along with pipe nipples, sprinkler heads installed in them have been returned as leaking after six months...

Thank you "Berti" for the information. I am not sure if I will be able to reply to you immediately on the results. regards

Can anybody suggest a good book which will assist in conducting failure analysis of rubber products like gaskets of Neoprene, EPDM etc.

Has anybody ever experienced shrinkage in EPDM material. We have gaskets made of EPDM. The cross-section of the gaskets is "C" shaped & they are circular. We have observed over a period of time the diameter shrinks by about 2% over six months. Any suggestions on how to fix this.

These are tolerance class for the taps themselves. Class 3H should generaly be suitable for class 3B female thread as per ANSI B1.1 Tap class GH5 for class 2B thread & so on. If you want I shall post a link which gives some of this information. Maybe you can ask some tap manufacturer to give...

Our component is such that if you provide seven threads as per Section I then the pipe will bottom out. What I mean in that the pipe nipple will not pass beyond the tapped hole. (as the tapped hole is semi-blind that is it has a smaller hole at the bottom.) On the tap you are saying we need not...

We need to have 2 1/2" (8 pitch) NPT female threads in one of our components. The tapping is in a partially blind hole. (at the bottom of the thread there is a 1/2" opening) 1) What is the right procedure for drilling & tapping. Should we taper machine the hole before we machine. How...