[modeleng] Re: Off topic a bit: UNF and UNC threads, now BA
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Fri, 21 Oct 2005 06:23:40 -0700 (PDT)
I can see how a tool may be ground/honed to cut the
proper profile for the bottom of a BA thread, but how
is the radius of the crests done--on the lathe?
Al Messer
--- Jeff Dayman <jeffdayman@xxxxxxxxxxxx> wrote:
> Hi Rich,
>
> The -2A and -2B is the thread class (fit) and the
> *.75 probably means 3/4"
> deep full thread.
>
> The thread class doesn't mean much for hobby work,
> it's used in commercial
> work to designate fit quality only if required. If
> you've got taps to suit,
> they may or may not have the class marked on them.
> If not, they'll probably
> cut normal commercial quality loose threads, fine
> for hobby stuff.
>
> The UNC does not mean UNCa Jesse Livingston needs to
> come and make yer
> threads, much as he might like to.
>
> Cheers, Jeff Dayman Waterloo Ontario Canada
>
>
> ----- Original Message -----
> From: "R.L. Roebuck" <rlr20@xxxxxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Thursday, October 20, 2005 9:29 AM
> Subject: [modeleng] Off topic a bit: UNF and UNC
> threads
>
>
> > Hi there All,
> >
> > I'm used to what I would call 'normal' UNF and UNC
> thread designations,
> > such as 1/2"*20 UNF, but I've got a few things on
> a drawing that don't
> > make sense to me - I wonder if anyone could shed
> some light on them.
> >
> > I have a stud marked as being threaded 1/2-20
> UNF-2A
> >
> > I have another stud marked as 3/4-16 UNF-2A
> >
> > I have a hole marked as 1/2-13 UNC-2B * .75
> >
> > Does anyone know what the stuf after the UNF or
> UNC refers to?
> >
> >
> > Yours,
> >
> >
> > Rich.
> > MODEL ENGINEERING DISCUSSION LIST.
> >
> > To UNSUBSCRIBE from this list, send a blank email
> to,
> > modeleng-request@xxxxxxxxxxxxx with the word
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> line.
> >
>
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