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Determining diameter of machined shaft prior to threading.

Determining diameter of machined shaft prior to threading.

Determining diameter of machined shaft prior to threading.

(OP)
I'm designing something simple where i need to create an internal and external 9/16-18 threading.

I know i need to drill the bore to 0.5156" prior to tapping

What diameter do i need to machine the shaft to prior to running the 9/16-18 die down it to create the thread?

Thanks

RE: Determining diameter of machined shaft prior to threading.

9/16

RE: Determining diameter of machined shaft prior to threading.

For a .5625-18 UNF-3A thread, the major diameter limits are .5625/.5538.

For a .5625-18 UNF-2A thread, the major diameter limits are .5611/.5524.

Good luck.

Terry

RE: Determining diameter of machined shaft prior to threading.

(OP)
Thank you all

RE: Determining diameter of machined shaft prior to threading.

For UN threads the relevant spec is ASME B1.1

If you don't want to get that and are willing to accept free information from the internet try: http://www.boltplanet.com/default.asp

Make the relevant selections (you don't have to put values in for the stress calcs) and 'calculate now'  A pop up will appear, at the bottom of this is the diameter info for both male & female.

KENAT, probably the least qualified checker you'll ever meet...

RE: Determining diameter of machined shaft prior to threading.

Oops, ASME B1.1 is relevant in the US the UK has it's own equivalent spec (I guess Canada does too but I don't know for sure)

KENAT, probably the least qualified checker you'll ever meet...

RE: Determining diameter of machined shaft prior to threading.

Unless this is a critical application, shoot for the low side for the major diameter.  A threading die sometimes has a tough time (galling, excess chip volume) if the diameter is nominal and/or if the threading die is in less than perfect condition.  A good method to use is single point threading in the lathe to get close, then run the die on to finish size.

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