[modeleng] Re: unknown thread
- From: "Terry Lane" <tel@xxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 15 Oct 2004 20:38:13 +1000
nope M6 is 1mm pitch
----- Original Message -----
From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, October 15, 2004 7:56 PM
Subject: [modeleng] Re: unknown thread
> Tim,
>
> 6BA is indeed 1mm pitch.
>
> For comparison,
> 20 Thury V 20 BA.
>
> OD / TPI
> Thury: 0.189"/208.2 tpi
> BA 0.1895" / 211.7 tpi
>
> To me, that looks sufficiently different not to have the same thread form.
> Alan
> ----- Original Message -----
> From: "Tim Rickard" <the_viffer@xxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Friday, October 15, 2004 10:35 AM
> Subject: [modeleng] Re: unknown thread
>
>
> Peter the BA thread s a totally metric thread. There is a mathematical
> relationship involving non integer powers that lets you calculate the
> dimensions of any BA thread starting from 0BA which is 6mm diameter and as
I
> recall 1mm pitch. There are details in Tubal Cain's Workshop Handbook but
> I'm glad to copy it out and either post it here or sent it to individuals
if
> there is any demand. I dread to think how they set up a lathe to cut them
> the first time.
>
>
>
>
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