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Posted by Dave Tonkiss (209.77.43.130) on November 11, 2002 at 12:51:51:

In Reply to: Special Screw posted by Domenick on November 07, 2002 at 07:29:20:

There are many options for using up the pitch clearances in nut/screw interfaces. Try looking at "Clich" nut type of female threads or "tri-lobal" deformation that would make pitch diameter contact and is excellent for vibration.

: I AM A DESIGNER OF MICROWAVE FILTERS AND QUITE OFTEN WE USE SCREWS OR STUDS WITH AN ELECTRICAL CAVITY TO FINE TUNE THE WAVELENGTHS TO THEIR CORRECT SETTINGS.

: OFTEN WE HAVE FILTERS THAT ARE SUBJECT TO VIBRATION AND SHOCK. WHAT I HAVE FOUND IS THAT THERE IS HIGH INSERTION LOSS (BAD CONTACT) AT MY TUNING SCREWS.

: WHAT I THINK IS THAT THE SCREW IS NOT MAKING GOOD CONTACT WITH ITS COUNTERPART THREAD. THREADS ARE ALSO SILVER PLATED SO THAT ADDS ANOTHER INCONSISTANCY.

: IS THERE ANYTHING I CAN DO TO GET A BETTER FIT?

: OR IS THERE SUCH A THING CALLED AN EXPANDING THREADDED SCREWS?

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: There are many options for using up the pitch clearances in nut/screw interfaces. Try looking at "Clich" nut type of female threads or "tri-lobal" deformation that would make pitch diameter contact and is excellent for vibration. : : I AM A DESIGNER OF MICROWAVE FILTERS AND QUITE OFTEN WE USE SCREWS OR STUDS WITH AN ELECTRICAL CAVITY TO FINE TUNE THE WAVELENGTHS TO THEIR CORRECT SETTINGS. : : OFTEN WE HAVE FILTERS THAT ARE SUBJECT TO VIBRATION AND SHOCK. WHAT I HAVE FOUND IS THAT THERE IS HIGH INSERTION LOSS (BAD CONTACT) AT MY TUNING SCREWS. : : WHAT I THINK IS THAT THE SCREW IS NOT MAKING GOOD CONTACT WITH ITS COUNTERPART THREAD. THREADS ARE ALSO SILVER PLATED SO THAT ADDS ANOTHER INCONSISTANCY. : : IS THERE ANYTHING I CAN DO TO GET A BETTER FIT? : : OR IS THERE SUCH A THING CALLED AN EXPANDING THREADDED SCREWS?

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